234 



POPULAR CONCHOLOGY. 



I pli ige n iabraziliensis. 



closed, triangular, nearly equilateral, 

 covered with a strong epidermis ; 

 the hinsre in the right valve has two 

 teeth, in the left a single one 

 doubly cleft, which interlocks with 

 them ; no lateral teeth ; ligament 

 external ; mantle impression with 

 a sinus. Animal unknown. — 3 

 species. 



Two species are known from Brazil and Central America, 

 as well as one from Senegal ; all are supposed to be found 

 in fresh water, and if this is certain, Philippi remarks, the 

 genus must be retained. 



Glauconome. Gray, — Shell oval, thin, equivalve, 

 slightly ventricose, inequilateral, 

 rounded anteriorily, more or less 

 attenuated posteriorily, covered 

 with a thin epidermis which some- 

 times extends beyond the margin ; 

 hinge, three teeth in each valve, no 

 lateral teeth ; ligament external. 

 Animal unknown. — 9 species.* 



Reeve says that these shells are found in brackish water, 

 at the mouths of rivers in the Philippines, the Ganges, &c. 

 They are distinguished by their thin light-green horny 

 epidermis. 



(Fluviatile genus, with the ligament internal.) 



Gnathodon. (Rangia Des Mqulins ; Clathrodon Cour.) 

 — Shell nearly oval, equivalve, inequilateral, and covered 

 with an olive-green epidermis, generally a little decorti- 

 cated at the umbones ; one lateral and two cardinal teeth 



Glaueonome chinensis. 



* Reeve's Iconica. 



