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of which it is firmly fixed to other bodies. Columna is the first writer, who 

 speaks of shells of this description. He mentions some few of the fossil tribe, 

 (the only ones known in his time) under the title of " Conchse variores Ano- 

 mia." Hence the term was afterwards employed by other writers, and has 

 since become the universal name for this family of shells. The Anomia 

 Terebratula is not common, and the Anomia Tridentata very rare : there are 

 thirty species known, and its divisions are three. 



DIVISION I. Lower valve flat and perforated. 



Scientific name. 



Craniolaris, 



Turbinata, 



Ephippium, 



Cepa, 



Electrica, 

 Punctata, 



Locality. 



Philippine Isles. 



Norway. 



China, Britain, Med. 



So. Seas, France, Africa, 



Britain. 

 France, Africa, Med. 

 Ferroe Islands. 



Scientific name. 

 Aculeata, 

 Muricata, 

 Undulata, 

 Pattelliformis, 

 Squama, 

 Bifida, 

 Cylindrica, 



Locality. 

 Norway, Britain. 

 Guinea. 



Brit., Norway, Med. 

 Norway. 



do. 

 Mauritius, Med. 

 Norway, Britain. 



DIVISION II. Having the umbo perforated, and generally a cartilaginous 

 substance in the interior of the shell. 



Scobinata, 



Aurita, 



Retusa, 



Truncata, 



Capensis, 



Dacollata, 



Pubescens, 



Sanguinea, 



Mediterranean. 



Norway. 



do. Mediterranean. 

 Cape of Good Hope. 

 Mediterranean. 

 Norway. 

 Indian Seas. 



Caput Serpentis 



Terebratula, 



Cranium, 



Crescenta, 



Dorsata, 



Prittacea, 



Rosea, 



Norway. 



do. Mediterranean. 

 Norway. 

 New Zealand. 

 Magellan. 



Newfoundland, Ind. S. 

 South Seas. 



DIVISION III. Imperforated, and having a truncated triangular hinge. 

 Placonta, Tranquebar, China. Sella, Tranq., China, Amboyna. 



