126 



aperturd dorsali minimd, margine limbi interni nigrkante : long. 

 0-9, lat. 0-6 poll. 

 Hab. ad Real Llejos, Americse Centralis. 



The dorsal perforation in this species is so small, and the colora- 

 tion so dark, that it is difficult at first sight to perceive that it is really a 

 Fissurella. 



Found under stones. — G. B. S, 



Fissurella injjqualis. Fiss. testd ohlongd, tenui, suhdepressd, la- 

 tere antico brevi, postico longo; intus albicante, margine albo ni- 

 groque vario, crenulato; exitts radiatim striatd, concinne decus- 

 satd, olivaced albicante subradiatim variegatd; aperturd dorsali 

 anticd, oblongd, utrinque bidentatd : long. I'l, lat. Q- 5 poll. 



Hab. ad Guacomayo et ad Insulas Gallapagos sub lapidibus litto- 

 ralibus. — G. B. S. 



Fissurella Pica. Fiss. testd oblongd, tenui, suhdepressd, latere 

 antico brevi, postico longo ; inths albicante, margine crenulato ,- ex- 

 tits radiatim striatd, coticinni decussatd, albd olivaceo variegatd; 

 aperturd dorsali anticd, ell ipticd, fere circulari, parvd : long, l", 

 lat. 0-57 poll. 



Hab. ad Sanctam Elenam et ad Insulas Gallapagos. 



Variat testa albicante, radiatim olivaceo fasciata. 



Found on dead shells in from six to eight fathoms water. — 

 G.B. S. 



Fissurella Chemnitzii. Fiss. testd ovato-oblongd, depressius- 

 culd, crassiitsculd, lateribus subcompressis , extremitatibus levatis; 

 intiis albd, impressione musculari prope marginem conspicud; ex- 

 tus radiatim subsulcatd, subdecussatd, pallescenie roseo subradiatd; 

 aperturd dorsali magnd, ovali, rimd internd latd : long. 2 2, lat. 

 1-4 poll. 

 Hab.} 



The onlj' specimen I have ever seen of this species was in the 

 Tankerville Collection, from which, after several vicissitudes, it has 

 at length found its way to Mr. Cuming's. 



This remarkable shell is represented by Martini (I. t. xi. f. 100), 

 whose figure is cited by Lamarck as a representation of Fiss. Grceca. 

 — G.B.S. 



Fissurella latimarginata. Fiss. testd ovato-oblo7igd, depressd, 

 crassiusculd, antici angustiore; intiis albd, margine lato rtifes- 

 centi-nigro, crenulato; extils radiathn creberrime striatd, rufes- 

 centi-nigrd; aperturd dorsali oblongd: long. 2'8, lat. ISpoll. 



Hab. ad Valparaiso et ad Iquiqui. 



Found on the rocks. — G. B. S. 



Fissurella trapezina. Fiss. testd subtrapeziformi, rotundato- 

 angulatd, antice angustiore, depressd, extremitatibus levatis ; in- 

 tiis albd, impressione musculari prope marginem retnotd, margine 

 incrassato ; extiis concentric^ subsulcatd, pullidd. fusco radiatd ; 

 aperturd dorsali magnd, laid, antici latiorc : long. 0-95, lat. 08 

 poll. 



