Zoological Society. 



151 



Mesodesma. Amphidesma. 

 UngaliBfL Cumingia. 



Family 6. Lithophaga. 

 Saxicava. Petricola. 



Family 7. Nymphacea. 



Sanguinolaria. Corbis. 



Psammobia. Lucina. 



Galeomma. Donax. 



Tellina. Capsa. 



Family 8. Conchacea. 

 Cyclas. Astarte. 

 Cyrena. Venus. 

 Galathaea. Cytherea. 

 Cyprina. Pullastra. 



Family 9. Cardiacea. 

 Cardium. Cardita. 

 Isocardia. Cypricardia. 



Family 10. Arcacea. 

 Cucullaea. Pectunculus. 

 Area. Nucula. 



Family 11. Trigonacea. 

 Trigonia. 



Family 12. Naiades. 

 Unio. Iridina. 

 Hyria. Mycetopus. 

 Anodon. 



Family 13. Chamacea. 

 Etheria. Chama. 



Order 2. Unimusculosa. 

 Family 1. Tridacnacea. 

 Tridacna. Hippopus. 



Family 2. Mytilacea. 

 Lithodomus. Mytilus. 

 Modiola. Pinna. 



Family 3. Aviculacea. 

 Crenatula. Vulsella. 

 Perna. Avicula. 

 Malleus. 



Family 4. Pectinacea. 

 Pedum. Plicatula. 

 Lima. Spondylus. 

 Pecten. 



Family 5. Ostracea. 



Ostrsea. Placunanomia. 

 Placuna. Anomia. 



Class 2. BRACHIOPODA. 

 Family 1. Tendinosa. 

 Lingula. Terebratula. 



Family 2. Adhcerentia. 

 Thecidium. Orbicula. 

 Crania. 



Class 3. GASTEROPODA. 



Order 1. Cirrhobranchiata. 

 Dentalium. 



Order 2. Cyclobranchiata. 



Chiton. Patella. 

 Chitonellus. 



Order 3. Cervicobranchiata. 



Family 1. Fissuracea. 

 Lottia. Emarginula. 

 Siphonaria. Fissurella. 

 Parmophorus. 



Family 2. Capulacea. 

 Crepidula. Hipponyx. 

 Calyptrsea. Pileopsis. 



Family 3. Macrostomata. 

 Velutina. Stomatia. 

 Sigaretus. Haliotis. 



Family 4. Tubispiracea. 

 Siliquaria. Vermetus. 



Order 4. Pleurobranchiata. 

 Family 1. Bullacea. 

 Bulla. 



Family 2. Semiphyllidiana. 

 Pleurobranchus. Umbrella. 



Family 3. Aplysiana. 

 Aplysia. Dolabella. 



Order 5. Nucleobranchiata. 

 Carinaria. 



