SAXGUINOLARIA. 391 



Sub-gen. psammocola, Blainville (Azor, Leach, not Gray). 



Shell with the surface of the valves smooth ; the hinder side 

 but slightly angulated. 



castrensis, Chem. oriens, Desk. 



florida, Gould. solida, Gray. 



grata, Desh. Strangei, Gray. 



lata, Desh. togata, Desh. 



maxima, Desh. tristis, Desh. 



nivosa, Desh. vespertina, Lam. 

 occidens, Lam. 



Sub-gen. AMPHiCHiENA, Philippi (Psammobella, Gray). 



Shell elongated, gaping at both sides, the hinder side rounded. 



augusta, Desh. Menkeana, Desh. 



caudidula, Desh. modesta, Desh. 



costulata, Turton. petalina, Desh. 



Kindermanni, Phil. tellinella, Lam. 



Genus SANGUINOLARIA, Lamarck. 



Shell equivalve, inequilateral, transversely oblong, thin, 

 compressed, a little gaping at both sides, attenuated but 

 not carinate posteriorly; margins curved, not parallel. 

 Hinge with two approximate primary teeth (sometimes bifid) 

 in each valve; ligament external, conspicuous, on a 

 prominent fulcrum or thickening of the hinge-margin. 

 Pallial line with a deep sinus. 



Syn. Lobaria, Schum., not Mull. 



Ex. S. sanguinolenta, Chemnitz, pi. 103, fig. 3, 3, a. 



The siphons of the animal, like those of most of the genera 

 in this family, are very long and slender, the mantle is freely 



