412 PAPHIIM. 



Genus cumingia, Sowerby. 



Shell equivalve, inequilateral, anteriorly rounded, poste- 

 riorly sub-truncate and slightly gaping. Hinge with a 

 small, anterior primary tooth in each valve ; cartilage inter- 

 nal, in a spoon-shaped cavity projecting into the cavity of 

 the valves ; one strong lateral tooth on each side of the 

 hinge in one valve, no lateral teeth in the other. Anterior 

 muscular impression irregular and oblong, posterior 

 rounded ; pallial line with a very large sinus. 



Ex. 0. mutica, Sowerby, pi. 105, fig. 6, 6, a. 



The species of Cumingia are usually found in sponges, 

 sand, and the fissures of rocks ; the valves, in consequence, 

 often assume an irregular aspect. Examples of the genus 

 have occurred in Australia, the Philippine Islands, India, 

 Western America, and the West Indies. 



Species of Cumingia. 



Antillarum, D'Orb. similis, A. Adams. 



Californica, Conr. sinuosa, A. Adams. 



Clerii, A. Adams. striata, A. Adams. 



coarctata, Soiv. tellinoides, Conr. 



fragilis, A. Adams. tenuis, H. and A. Adams 



lamellosa, Soiv. (Antillarum, A. Adams). 



mutica, Sow. trigonularis, Soiv. 



Petitiana, D'Orb. 



o~- 



Sub-fam. PAPHIINiE. 



Animal with the siphons separate and diverging. 



Shell equivalve, closed, with the cartilage in an internal 

 pit, and with a simple, compressed primary tooth, and a 

 rudimentary process in the place of the second tooth. 



