THEORA. 369 



rior side. Hinge composed of an oblique and spathulate 

 cartilage-process in each valve, usually with a minute tooth 

 in front, and a more or less developed posterior lateral 

 tooth; ossicle distinct, sub-circular; ligament external, 

 small. Muscular impressions large ; pallial line with a 

 very shallow sinus. 



Syn. Cuspidaria, Narclo. Sphena, UOrb. 



Ex. N. cuspidata, Olivi, pi. 97, fig. 4. Shell, N. cuspi- 

 data, fig. 4, a, 4, b. 



The species of Neara appear to be pretty generally dis- 

 tributed throughout the seas of both temperate and tropical 

 countries. They are inhabitants of deep water, living in 

 from twelve to two hundred fathoms. Examples occur in 

 China, Borneo, the Moluccas, New Guinea, Chili, Madeira, 

 Norway, Britain, and the Mediterranean. 



Species of Neccra. 



abbreviata, Forbes. elegans, Hinds. 



alternata, D'Orb. Gouldiana, Hinds. 



attenuata, Forbes. byalina, Hinds. 



casta, Hinds. Moluccana, Adams and Reeve. 



Cleryana, UOrb. nitida, Adams and Reeve. 



cocblearis, Hinds. ornatissima, D'Orb. 



concinna, Hinds. Pbilippinensis, Hinds. 



costata, Sow. rosea, Hinds. 



costellata, Desk. rostrata, Chem. 



cuspidata, Olivi. Singaporensis, Hinds. 



didyma, Hinds. trigona, Hinds. 



Genus THEORA, H. and A. Adams. 



Animal unknown. 



Shell compressed, smooth, Polished, hyaline, valves 



