30 



MOLLUSCA. 



cavity ; in several species it contains a small, flat, and oblong shell, 

 or at least a calcareous concretion in place of it. The respiratory 



Vermetus 

 Scalaria 

 Delphi nula 



ntus ____ ~\ 

 "I* ...... ^ 



i u u hi ... I 



Solarium. 

 Rotella. . 

 Trochus 

 Monadonta 

 Turbo 

 Planaxis 

 Phasianella 

 Turritella, . 



onta .... v 

 is .. 



Ninth Family. 

 Les Scalai-iens. 



Tenth Family. 

 Les Turbinac^s 



Shell having no plaits on the 



columella, the edges of the 



) aperture united circularly. 



1 Animal a vermicular Tra- 



chlipode, and breathing wa- 



ter only. 



C Shell turretted or conoid, aper- 

 ture round or oblong, not 

 I widened, having the edges 

 ^ disunited : they appear fur- 

 i nished with an operculum. 

 The animal breathes only 

 water. 



Second Section. Les Zoophages. 

 ANIMALS feeding on animal substances only. 



"Tracht'lipodos with 



Genus Cerithium . . 



.... Pleuromata . 



.... Turbinella . 



.... Cancellaria . 



.... Fasciolaria . 



.... Fusns ...... 



.... Pyrula 



Struthiolaria 

 Ranella 



Murex 



Triton .... 



Rostellaria 

 Pterocera. . 

 Strombus. . 



First Division. ' 

 Species without 

 any permanent 

 varix or thick- 

 ened lip on the 

 right margin. 



Second Division. 

 All the species 

 having perma- 

 nent varices, or 

 a thickened lip 

 on the right side. w 



Second Family. 

 Les Ail^es. 



project- 

 ing or salient syphon, breath- 

 ing water only, conveyed to 

 the branchiae or gills by that 

 syphon ; they feed upon ani- 

 mal substances only, are 

 marine, without jaws, and 

 provided with a retractile 

 proboscis. Shell spirivalve, 

 inclosing the. animal; the 

 aperture either canaliculated 

 or notched at the base ; the 

 right lip not changing its 

 form by age, the canal more 

 or less long ; all having oper- 

 cula. In the first division of 

 this family, the additional 

 growth is but slightly marked, 

 in the second, it is distin- 

 guished by thickened bands 

 or varices, which remain on 

 the external whorls, except 

 in the genus Struthiolaria, 

 which has only a thickened 

 lip. 



Shell having a canal more or 

 less long at the base of the 

 aperture, the right side of 

 which changes its form with 

 age, and becomes wing- 

 shaped ; a sinus at the lower 

 part of the lip. These shells 

 present the remarkable fact 

 of being totally different in 

 form in an adult state, from 

 that in the young ; a fact 

 only observable in the G. Cy- 

 praea besides this family. 

 The operculum of the ani- 

 mals of this family is horny, 

 long, and straight. 



