'.) 



GASTEROPODA PHCTIN1BRANCHIATA. fiu 



tion and a semi-canal, whi-l. aduct water Into t 



i-hi;il c.ivity, and \vhieh form tli to the following family, but 



of \vhii-!i tlier- an- no impression^ on th" shell. The tentacula are 

 eonieal. with tin- e\v.s at their external bas : tin- penis of the male U 

 very I 

 Some species are found on the coast of France. The 



CORIOCELLA, Blainv., 



Consists of Sigareti, the shell of which is horny, and almost mem- 

 branous, like that of the Aplysiee*. 



CRY rn )<T<> MA, Blainv. 



I embling tl.:t of a Sigaretus, with the head an<l abdo- 



men, which it covers, supported by a foot four times its size, cut 

 Mjnarc behind, and forming before a fleshy, oblong bundle that con- 

 stitutes nearly one half of its mass. The animal has a flat head, two 

 ula, a broad branchial pecten on the roof of its dorsal cavity, and 

 a penis mi ler the right tentuculum ; but I can fiii:l no cmargination 

 in the manllef. 



FAMILY III. 

 BUCCINOIDA. 



This Family lias a spiral shell, in the aperture of which, i\ear the 

 xtivmity of the columella, is an emargination or a canal for transmit- 

 ting the siphon or tube, which is itself but an elongated fold of the 

 ie. The greater or less length of the canal, when there is one, 

 tip- size of the aperture, and the form of the columella, furnish 

 the grounds of its division into genera, which may be variously 

 grouped J. 



CONUS. Lin. 



ill '1 from the conical shape of the shell; the spire, either per- 

 fectly flat, or bnt sightly salient, forms the base of the cone, tlw 

 : the opp< mity; the aperture is narrow, recti- 



linear, or nearly so, extending from one end to the other without 

 t or fold, either on its edge or on the columella. The 



* The Coriocolk \LII, f. 1. This animal is not 



of n UrU, a I, V.-.r ii i- ti.iu and flexible. 



i^eum (Cr. L.M-hii, liluinv. Malar., KLII, 



3), we k|V4ptf ( ' L'Uonnii. 



J T ', iHobriinchiiita of Blaimilk 1 . 



M. . Terebella, and the Yvlutce, in a 



9TO iv. 



-traight aperture, r ht- mulcrstood as 



intMiiiiiu' tn approximate them to the preceding family, but only to present them 

 . as possessing the uiracters of all those which arc- nirnMu-tl \\ith 



a >i|ihmi. 



VOL. III. F 



