BIVALVES. ANOMIA. 69 



ANOMIA Anomia. 



DIVISION I. Lower valve flat and per/orated. 

 Craniolaris Cranium. *Aculeata Prickly-valved. 



Turbinata Top-shaped. Muricata Muricated. 



*Ephippium Orbicular. *Undulata Striated. 



*Cepa Onion. Patelliformis Limpet- shaped. 



*Electrica Small-amber. Squama Scaly. 



Punctata 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. Caput-serpentisSnake'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. Irnperf orated, and having a truncated triangular 



hinge. 

 Placenta Cake. Sella Saddle. 



