I ii:
I i
ii :
C R U S TA C EA . 79
F rom th e so f t c lay t h a t ad h e red to tire c a ra p a c e , I au epe c t th a t thia apeeiea has th e aame b o rrow in g
aucta.
aucta.
aucta.
h ab its a s th e Gelasimi.
T he sp e c im en s we re ta k e n a t O ah u , S an dw ich Is le s .
P l a t e XXIV.* F ig . 1. G e l a s im u s t e l e s c o p ic u s , m a s .
1 a. Antenna media,
1 b. Antenna lateralis,
1 c . Pedipalpus externus,
1 d. Cauda maris.
1 e. Cauda feminoe.
1 / . Chela sinistra femince.
3 . G e l a s i m u s m i n o r , n . s .
c a . elgpeo cmoexo. ¡« « i, M ler itu , inermibm ; chslà à M r i m a jM , poliiee Imgiore, t o O t a 5« ! « ,.« o rm u o .
Long, clypei, Un. 5 ; la t. lin . 7 .
Color clypei fe rru g in e u t, chelarum aurantius.
T h e c a ra p a c e is sm o o th , co n v e x , b ro a d e r in f ro n t th a n b e h in d ; th e a n te r io r m a rg in is sim ia tc ,
c a n a lio n la te , w itl. a d e p re s s e d rostrmm, g ro o v ed a lo n g th e m id d le , w h o s e b a s e is o n e fifth th e b re a d th
o f th e a n te r io r m a rg in ; tlio a n te r io r a n g le s a r e s lig h tly p ro d u c e d . T h e m id d le o f th e c a r a p a c e ha s
l in e a r im p re ssio n s in th e form o t th e le tte r H ; s lig h tly e le v a te d lin e s m a rk o n t th e " S “ “ '
T h e o p h th a lm ic p e d u n c le s e x te n d to th e a n g le s o f th e sh e ll ; th e g ro o v e s in w h ic h th e y lie b av e
fin e ly c r e n a te m a rg in s . ' .
T h e r i - h t cM « , a s in th e r e s t o f th e g en u s , i s d isp ro p o r tio n a te ly la rg e ; th e h u m .,u s is v e ry
sm a ll • th e u hm e n la rg e d , t r ih e d r a l, c r e n a te a t th e in fe rio r a n g le , w ith a s in g le to o th a t th e i n n e r an g le ;
th e 2 a n u s is m in u te ly g r a n u la te l ik e sh a g re e n , c o n v e x e x te rn a lly , w ith a n e le v a te d lin e o f g ra n u le s
a lo n g th e su p e r io r a n d in fe rio r b o rd e rs ; s in u a te in te rn a lly , a n d b e a r in g o n th is a s p e c t tw o t r a n s ve
rse row s o t sm a ll tu b e r c le s , n e a r th e b a s e o t th e th um b . T h e finge rs w h e n c losed le a v e a c o n s id
e r a b le in te r s p a c e , a n d th e p o l k , o v e rla p s th e d ig itu s : th e l a t te r h a s a n e le v a te d to o th n e a r th e
e x tr em ity a n d s ix o r sev en n e a r th e b a s e ; th e p o lk x is m o re b e n t e sp e c ia lly a t th e e x tr em ity , i t h a s
a n e le v a te d to o th o n e th ird o f th e w a y from th e a p e x , a n d th r e e o r fo u r n e a r th e b a s e . T h e s e p a r t i -
e u la rs a r e c o n s ta n t in th r e e sp e c im en s which I h av e e x am in e d . T h e d ig its o f th e sm a lle r cAde a re
so a tu la te , a n d h ir s u te a t tlie ir e x tr em itie s , a s in Gelustmus D u p e r r e y i, (Z o o lo g ie d e la C o q u ille , A tla s ,
C ru s ta c é s ol 1. fi». 2 . 2 a , ) to which th is sp e c ie s h a s c o n s id e ra b le alfiuity, b u t from which i t diffe rs in
lia v in v th è c a r a p a c e la r g e r in th e tr a n sv e r s e th a n in th e lo n g itu d in a l d iam e te r, a n d m o re c o n v e x
th a n is r e p r e s e n te d iu th e fig u re q u o ted . T h e b r e a d th o t th e rostrum a lso , w h ic h m Gel. mmor
e q u a ls o n e fifth o f th e b r e a d th o t th e a n te r io r m a rg in , in G d . D iip e ire y i sc a rc e ly e q u a ls o ne e ig h th ;
a u d th e o p h th a lm ic p e d u n c le s a r e co n s e q u e n tly sh o r te r in o u r spe c ie s. T h e finge rs o t th e g r e a t chela
differ in th e ir p ro p o rtio n s , th e d ig itu s b e in g sh o r te r a n d m o re o b tu s e . F rom G d a s im u s <#«i>, o t wh ich
p a r t o f th e ehelu o n ly is r e p r e s e n te d {loco cit. p i. 1. fig. 3 .) , o u r s p e c ie s a lso d iffe rs in th e p ro je c tin g
te e th a lo n g th e c o n c av e m a rg in o f th e polhx.
O f th e c law s th e fo u rth p a ir a re th e lo n g e s t; Ûie fem o r a a r e com p re s s ed , a n d n o tch ed a t th e
s u p e r io r m a rg in , n e a r th e a p e x ; th e la s t jo in ts a r e v e ry sle n d e r, a n d s lig h tly cu rv e d .
T h e sp e c im en s a re a ll m a le s , a n d w e re ta k e n a t O a h u , S a n dw ic h Is le s .
P la t e XXIV . F ig . 2. G e l a s im u s m in o r , m a s .
2 a. Chela dextra.
« T h e specim«». of N .to r a l History oollected in th is voyage, an d deposited in th e Museum of th e H o y .i College of
Surgeons, h ave be en tg u red for th is work by poimlssion o t th e Board of Curators.
lili
II,!!!