G3 



SYSTEMATIC ARRANGEMENT OF THE 

 FIGURES. 



The genera are chiefly arranged according to the "List of the Genera 

 of Recent Mollnsca, their synonyma and types," printed in the Pro- 

 ceedings of the Zoological Society for 1847, a copy of which accom- 

 panies this volume. The number after the generic name refers to 

 the number in the List, which shows the date of the generic name 

 and its synonyma. When any new synonyma have occurred to me 

 since the printing of that List, I have added the name after that of 

 the genus. 



Some alteration has been made in the disposition of the families. 

 The observations of Messrs. Cuvier and Quoy, strengthened by the 

 anatomical researches into the nervous system of these Mollusca by 

 M. Gervais, and the researches into the structure and disposition of the 

 siliceous teeth on the tongue-membranes of Dr. Loven, have shown 

 that the Trochidce, Turbinidce and Haliotidce must be removed from 

 the other Phytophagous Ctenobranchiata, and that the Patella and 

 allied families, and probably the Chitones, should be arranged with 

 them. 



The admirable researches of Dr. Loven on the metamorphosis of 

 Mollusca and the structure of the tongue of these animals, has shown 

 the necessity of several new families being established ; for though 

 the character furnished by the teeth on the tongue is difficult to ob- 

 serve, especially in the smaller animals, yet the modifications which 

 they assume must be characteristic of important differences in the 

 habit and organization of the animal. 



The name of the author from whom the figure of the animal has 

 been copied, precedes the reference to the plate in this work where 

 the species is figured. 



Class I. GASTEROPODA. 



Subclass I. CTENOBRANCHIATA. 



Order I. Pectinibranchiata. 



Suborder I. Zoophaga. 



Fam. 1. Strombidae. Fam. 6. Conidae. 



2. Aporrhaidae. 7- Volutidse. 



3. Muricidae. 8. Cypraeadae. 



4. Buccinidae. 9. Lamellariadse. 



5. Trichotropidse. 



