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550 C A T A L O G U E S H E L L S .
1 8 . T e e e e b a t u l a E L E X D O SA .
T . testd rotundato-cordatd, gibbd, suh-fuscd, ¡ongitudinaliter creber-
r im è su lca td ; m a rgine valdè fle x u o s o ; fcmg. I f ; lat. 1 | ¡mulo
m in u s ; poll.
H a b ita t in f r e to Magellanico (P o r t F am in e ). M u s . B r it., nost.,
B ro d .
T h is sh ell, w h ic h w as d r e d g e d u p from d e ep w a te r in th e b a y
o f P o r t F am in e , a tta c h e d to stones, is n o t a common sh e ll in th e
S tr a it.
1 9 . T e b e b b a t u l a S o w e b b i i .
T . testd subrotundd, p laniusculd, subfuscd, longitudinaliter ra d ia tim
transversim substriatd, medio superne d ep re s si, in fr a cotivexd, sub-
g la b r d ; margine utrinque crenulato, medio g la b r o ; Umg. I jV >
lat. p a u lo p lu s ; alt. J J poll.
H a b ita t in f r e t o Magellanico. M a s . nost.. Geo. Somerby.
2 0 . C h i t o n s e t i g e e .
C. testd m a li, an tic é subattenuatd; valvis subdentatis, tenuitcr concentrice
s tria tis, untied \0 -ra d ia td , postica Iccvi, p a r v u ld ; areis
lateralibus striis duabus elevatis marginalibus ; ligamento m a rg
in a li Icevigato, setigero; long. 2| ; lat. I f ; poll.
H a b ita t a d oras insulce T ie rra d e l F u e g o et in fr e to Magellanico.
M u s . B r it., nost., B ro d .
S h e ll ova te , r a th e r a tte n u a te d tow a rd s th e a n te rio r e n d , g e n e ra lly
o f a lig h t b lu e -g re e n c o lo u r, v a rie g a ted w ith m a rk in g s o f d a rk
slate. V a lv e s s lig h tly b e ak e d w ith m m u te co n c e n tric striae, th e
la te ra l c om p a rtm e n ts w ith tw o m a rg in a l rid g e s , w h ic h in some
specimens a re g ra n u lo s e , in o th e rs smooth. T h e a n te rio r v a lv e has
e ig h t, b e sid e s tw o m a rg in a l, rid g e s o f th e same c h a ra c te r ; th e p o s te
rio r valve is v e ry sm all a n d smooth. B o rd e r coriaceous, a n d set
w ith b ris tle s p ro d u c e d from th r e e row s o f tu f ts o r p o re s. In some
o f th e specimens in m y possession th e b ris tle s a re ru b b e d off.
T h e sh e ll is fo u n d in all p a r ts o f th e sh o re s o f T ie r r a d e l F u e g o ,
p a rtic u la rly on its se aw a rd coast, a n d th e w e s te rn p a rts o f th e S tr a it
o f M agalhaens.
2 1 . C h i t o n B o w e n i i .
C. testd oblongo-ovatd, ca sta n eo -ru fd ; dorso elevato; valvis suhden-
tatis, siiblxvibus concentrice tenuiter slria tis ; areis lateralibus
s u lc a tis ; ligamento m a rg in a li granuloso, n ig ro ; lo'ig.
lat. I J ; ¡¡oil.
C A T A L O G U E — S H E L L S . 551
H a b ita t ad oras insula: T ie r r a d e l F u e g o et in f r e to Magellanico.
M u s . B r it., nost., Bro d .
S h e ll oblo n g -o v a te , a n d g e n e ra lly o f a c h e s tn u t re d , a n d th e
g ran u lo se lig am e n t b la c k ; th e co lo u r o f th e y o u n g e r specimens
is m o re b rillia n t, a n d sometimes in te rsp e rs e d w ith yellow. M id d le
va lv e s s lig h tly to o th e d , a n d v e ry d e lic ate ly lin e a ted , th e lines
fo rm in g a n o b tu s e a n g le in th e d ire c tio n o f th e axis o f th e shell ;
th e la te ra l c om p a rtm e n ts a re m a rk e d w ith d e ep e r s triæ a o r grooves,
r a d ia tin g from th e u p p e r a n g le to th e base, w h ich , c ro s sin g th e
tra n sv e rs e m a rk in g s o f th e va lve , h a v e a re tic u la te d a p p e a ra n c e :
th e an te rio r a n d p o s te rio r valves a re ra d ia te d w ith fine lines.
T h is C h ito n was d isco v e red b y M r. B ow en , su rg e o n o f th e
B eag le , b y whom it was p re s en te d to me. T h e specimen was
s e n t h om e am o n g a co lle ction o f N a tu ra l H is to ry , tra n sm itte d in
th e y e a r 1827.
22. F i s s u r e l l a c o a r c t a t a .
F . testd ovatd, anticé attennatâ, elevatâ ; ra d iis fr eq u e n tib u s elevatis ;
interne virescenti ; fo r am in is margine exlerno ju x ta medium coarc-
tato, subdentato ; long 2 / ^ ; lat. 1 J | ; alt. T6 ; poll.
H a b ita t ad Po rtum P r a y a . M u s . B r it., nost.
23. H e l i x t r a n s l u c e n s .
H . testd subglobosd, translucente, levissime transversim s tr ia tâ ;
a n fractu basali lined longitudinali castaned sub-medid ornato ;
long. J I ; lat. ; poll.
H a b ita t ad R io de J an e iro , M u s . B r it., nost., Brod.
2 4 . H e l i x p u s i o .
H . testd rotundo-complanatd, creberrime striatâ, transbicente, maculis
castaneo-rufis ornatd ; long. ; lat. ; poll.
H a b ita t a d J u a n F e rn a n d e z . M u s . B r it., nost., Brod,
25. H e l i c i n a s o r d i d a .
H . testd globoso-conoided ; a r fra c tib u s rotundatis longitudinaliter
s tr ia t is ; operculo castaneo ; lo n g .^ paulo p lu s ; lat paulo
p lu s ; poll.
H a b ita t a d R io de J an e iro . M u s . B r it., nost.
T h e colour o f th is shell is o f a d ir ty y e llow ish w h ite , w ith
a s lig h t tin g e o f diap h an o u s v io le t w ith in th e m a rg in o f th e lip.
26. P u p a s u b d i a p h a n a .— N o. 194. MSS.
P . testd cylindraced, albd, subdiapkand, transversim creberrime suh-
.Hriatd ; long. | paulo minus ; lat. paulo minus ; poll.
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