382 HISTORY OF SYSTEMS. 



Fam. 8. Volutes, Ferussac. Genera — Voluta, Cym- 

 bium. 

 -\ f f Neither membranous appendage nor siphon. 



Fam. 9. Sigarets, Ferussac. Genera — Coriocella, 

 Sigaretus, Cryptostomus, Stomatella, Stomatia, 

 Velutina. 

 Order VIII. Scutibranches, Cuvier. 



Fam. 1. Ormiers, Cuvier. Genus — Haliotis. 



Fam. 2. Cabochons, Ferussac. Genera — Calyptrea, 



Crepidula, Notrema, Hipponix, Capulus. 

 Fam. 3. Patelloides, Ferussac. Genera — Parmo- 

 phorus, Emarginula, Fissurella. 

 Order IX. Cirrobranches, Blainville. 



Fam. 1. Dentales. Genus — Deutalium. 

 Order X. Cyclobranches, Cuvier. 



Fam. 1. Patelles, Ferussac. Genus — Patella. 

 Fam. 2. Oscabrions, Ferussac. Genus — Chiton. 



Class ACEPHALES, Cuvier. 



1 Section. Acephales Testaces, Cuvier. 

 Order I. Brachiopodes, Cuvier. 



Fam. 1. Lingules. Genus — Lingula. 



Fam. 2. Terebratules. Genera — Terebratula, 



Strophonema, Thecidea, Calceola. 

 Fam. 3. Cranies. Genera — Crania, Orbicula. 

 Order II. Rudistes, Blainville. 



Fam. 1. Acardes, Ch. Des Moulins. Genera — 

 Spha?rulites, Hippurites. 

 Order III. Lamellibranches, Blainville. 



1 Division— Monomyaries. 



Fam. 1. Ostraces, Cuvier. Genera — Anomia, Pla- 



cuna, Harpax, Ostrea, Gryphaea. 

 Fam. 2. Pectinides, Lamarck. Genera — Podopsis, 



Spondylus, Hinnites, Plicatula, Pecten, Dianchora, 



Pedum, Plagiostoma, Lima. 

 Fam. 3. Malleaces, Lamarck. Genera — Posidonia, 



Vulsella, Perna, Crenatula, Malleus, Gervilia, Ino- 



ceramus, Pulvinites, Catillus. 

 Fam. 4. Avicules. Genus — Avicula. 



2 Division. — Dimyaires. 



Fam. 5. Arcaces, Lamarck. Genera — Cuculaea, 

 Area, Pectunculus, Nucula, Trigonia. 



Fam. 6. Mytilaces, Cuvier. Genera — Mytilus, 

 Lithodomus, Pinna. 



Fam. 7. Submytilaces, Blainville. Genera — Ano- 

 donta, Unio, Cardita, Cypricardium. 



