BIVALVES. — ANOMIA. 69 



ANOMlA—J7iomia. 



Division I. — Lower valve flat and perforated. 

 Craniolaris — Cranium. *Aculeata — Prickly-valved. 



Turbinata — Top-shaped. Muricata — Muricated. 



*Ephippium — Orbicular. *Undulata — Striated. 



*Cepa — Onion. Patelliformis — Limpet-shaped. 



*Electrica — Small-amber. Squama — Scaly. 



Vwncidiiai— Dotted. Bifida — Bifid. 



*Cylindrica — Cylindrical. 



Division II. — Having the umbo perforated, and generally a car- 

 tilaginous substance in the interior of the shell. 

 Scobinata — Rough. Sanguinea — Scarlet-rayed. 



Aurita — Eared. Cdi^ut-sex^entxs-- Snake' s-head. 



Retusa — Blunt. *Terebratula — Lamp. 



Truncata — Truncated. Cranium — Brittle. 



Capensis — Cape. Cruenta — Blood-red. 



Decollata — Semicircular. Dorsata — Keeled. 



Pubescens — Downy. Psittacea — Parrot-beak. 



Rosea — Pink. 



Division III. — Imperforated, and having a truncated triangular 



hinge. 

 Placenta— CaA-e. Sella — Saddle. 



