I .
90 C R U S TA C EA .
Tw o o th e r sp e c ie s o f H ip p o lite w e re a lso ta k e n a t M o n te r e y , C a lifo rn ia , b u t tlie ir d is tin g u ish in g
f e a tu re s a r e le s s m a rk e d th a n th e p re c e d in g ; th e y m a y b e th u s c h a r a c t e r i z e d :
27. H i p p o l i t e L a y i .
H ip . roalTO acuminata, supra multi.serralo, ante medium subtus quadri-scrralo.
Long, corp, wne. 2 J . Color ruber.
P l a t e X X V II. F ig . 3 . Rostruyn auctum.
28. H i p p o l i t e a f f in i s .
H ip . rostro antennis superioribus breviore, supra mulli-serrato, ante medium subius ses-semilo.
Long, corp. l i . Color ruber.
P l a t e X XV II. F i g . 4 . Rostrum auctum.
I n a d d itio n to th e d iffe ren c e in th e s e rra tio n s o f th e rostrum, w h ich p ro b a b ly v a rie s in diffe ren t
in d iv id u a ls o f th e same sp e c ie s , ( a lth o u g h th e n um b e r w a s c o n s ta n t as a b o v e q u o te d in th r e e sp e c im
e n s o f e a ch sp e c ie s w h ic h w e re p re s e rv e d ,) H ip . L a y i h a s a lo n g e r and n a rrow e r ro strum , e x te n d in g to
th e e x tr em ity o f th o su p e rio r a n te n n a ; tlie in f e r io r seta o f th e s e a n tenna is also proportiona l)!)’ lo n g e r.
H ip . affinis h a s a sp in e a b o v e th e e ) e , a t th e ro o t o f th e rostrum, wliich is w a n tin g in tiie H ip . L a y i ;
w h ils t thi.s sp e c ie s h a s th e fifth a n d s ix th a b d om in a l s egm en ts u n is jiiiioiis in l'e rioily on e a ch sid e .
H ip . affinis h a v in g th e s ix th s e gm e n t o n ly so a rm e d .
F rom th e j4//>Ae«s PoZai’is o f S a b in e (Z o o l. A p p e n d ix to P a r r y 's Voyage, p . 238. p i. 2. fig. 6.),
w h ic h is a H ip p o lite oi Le&ch, a n d from th e sp e c ie s c h a r a c te r iz e d by th e l a t t e r a u th o r in th e xVlala-
c o s tr a c a P o d o p h . B r it., th e a b o v e sp e c ie s diffe r in th e forms a n d p ro p o rtio n s , a s we ll a s in th e s e r r a tio
n s o f th e ro s trum .
O rd o STOMA POD A , Latr.
S e c t i o n U N I P E L T A T A , L a tr.
G e n u s S Q U IL L A , L a tr .
29. S q u i l l a c i l i a t a . L e a c h , M S . n . s ,
S q . Jlava, la v is , pedipalpis primis inermibus ciliatis, polUcihus eecundorum Iridentalis.
Long, corp. unc, 2. lin . 8.
T h is spe c ie s h a s a sm o o th a n d p o lish e d b o d y , o f a y e llowish co lo u r. T h e p e n u ltim a te s e gm e n t
o f th e ab d om en h a s s ix sp in e s , tw o o f w h ich a r e pla c ed on th e .superficies, a n d fo u r a t th e p o s te rio r
m a rg in . O n th e la s t s e gm e n t a re th re e c a rin a , w h ich en d in spine .s ; a t th e p o s te rio r m a rg in a rc s ix
sp in e s , o f w h ich th e m id d le tw o a re m o v e ab le . T h e e x te r io r o f th e n a ta to ry lam e lla o f th e ta il is
s e r r a te a lo n g th e o n te r m a rg in , a n d u n isp in o u s a t th e ex trem ity , to wliich a ro u n d c ilia te p la te is a lso
a tta c h e d ; th e in n e r lamella h a s tw o sp in e s a t t h e e x trem ity .
T h e ftTSt pa\T oi p ed ip a lp i is lo n g , s le n d e r , a n d te rm in a te s in a f la tte n e d ov a l p la te , u n a rm ed
a n d c ilia te d . T h e p o lle x o r m o v e ab le j o in t o f th e se c o n d p a ir lias th r e e e lo n g a te d sp in e s .
I n th e p ro p o r tio n s o f th e antenna, a n d in th e form o f th e n a ta to ry c a u d a l lame lla, th is species
re s em b le s th e S q u illa C hiragra o f F a b r i c iu s ; b u t d iffe rs from it in h av in g sp in e s o n th e th um b , an<l
from e v e ry o th e r d e s c rib ed spe c ie s o f S q u illa in h a v in g th e firs t p a ir o f f e e t-p a lp e s u n a rm ed .
C R U S TA C EA . 91
On lo o k in g ov e r t t c C ru s ta c e a a t tl.c B ritish M u s e um , I fo u n d a sp e c im e n o t th is sp e c ie s , w ith
th e ,u,men l n . « / e h e re a d o p te d a t ta c h e d to it , in th e h a n dw r itin g o t Dr. L e a c h , h o t w ith o u t o th e r
h is to ry . T lic p r e s e n t sp e c im e n w a s ta k e n by M r . L a y , a t W o a h o o , S a n dw ic h I s le s .
P l a t e X XV II. F i g . 5 . S q u i l l a c i l i a t a .
6 a . A n te n n a m ed ia .
5 6. A n te n n a la te ra lis .
5 c. P e d ip a lp u s p r im u s .
6 d . P e d ip a lp u s se cu n d u s.
L e g i o n E D R IO PH T H A LM A , Leach.
O r d o AMPH IPO D A, Latr.
G enus G AM M A R U S L a tr . Leach.
Cauda s ty lis gem in a tis, superioribus s ty lis subaqualibus.
3 0 . G a m m a r u s T y p h l o p s . n . s.
G. Icevis, pedibus anticis articulo ultimo subtus serrato, processu inter antennas suhacuminato, oculis vis apparentibus.
Long, corp, lin. 15.
T h e b o d y o f th is sp e c ie s is sm o o th a n d s h in in g . T h e head is la rg e , a n d v e rtic a l in p o s i t io n ; i t i s
o v e rlap p ed b y th e first s e gm e n t o f th e bod y . T h e firs t se v e n s e gm e n ts h a v e la te r a l p la te s a tta c h e d to
th em , o f w h ic h t h a t o f th e fo u rth is th e la rg e s t. T h e legs, fo u r te e n in n um b e r , a r e s u b e q u a l, a n d t e rm in
a te in sim p le c u rv e d c law s , th e f ir s t p a ir h a v in g in a d d itio n s e rra tio n s a lo n g th e u n d e r p a r t o f th e
l a s t jo in t . B e h in d tlie se a re fo u r p a irs o f s p u r io u s o r n a ta to ry fe e t. T h e ta il co n s is ts o f s ix e lo n g a te d
p ro c e s s e s , to e a c h o f w h ich is a r tic u la te d a p a ir o f a c um in a te s ty le s . A sm a ll t r ia n g u la r p la te ,
which is bifid a t th e a p e x , o v e rla p s th e o r ig in s o f th e c a u d a l pro c e sse s.
P l a t e X X V III. F i g . 4 . S id e v iew o f G a m m a r v s T y p h l o p s .
4 a . F i r s t c law .
6 b . C a u d a l s ty le s .
5 c, d . H e a d a n d a n te n n c e , m a g n ifie d ,
o f a s p e c im e n in wh ich th e s u p e r io r an tem m h av e lo s t som e o f th e te rm in a l se gm e n ts , a n d e n d in a
b la c k c o n v ex sp e ck .
F rom th e s im p le c h a r a c te r o f th e fe e t, th is sp e c ie s w o u ld p ro b a b ly h a v e co n sD tu ted a new g en u s
w ith D r . L e a c h ; b u t as th e su p e rio r antennce m an ife s t th e p e c u lia r c h a r a c te r (v iz . th e sty lifo rm
a p p e n d a g e a t tb e fo u rth jo in t ) o f th e g ro u p to which he h a s re s tr ic te d th e te rm G am m a ru s , i t ha s n ot
b e e n th o u g h t a d v is ab le to s e p a r a te it.
I t is a n a tiv e o f th e A rc tic Se a s.
O r d o ISOPODA, Latr.
G en u s ID O T E A . Fa b r.
3 1 . I d o t e a E n t o m o n , Latr.
Oniscus Entomon. Pallas, Spicil. Zo o l fa sc. 9. p . 64. tab. 5. f g . 1. 2. 6.
T h is sp e c im en , w h ic h m e a su re s fo u r in c h e s in le n g th , w a s ta k e n o n th e c o a s t o f K am ts c h a tk a . •
N 2
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