NEW FRESH WATER AND LAND SHELLS 221 



Hab. Java. G. Von den Busch, M. D. 



My Cabinet, and Cabinet of Dr. Von den Busch of Bremen. 

 Diam. .8, Length 1.3, Breadth 2.2 inches. 



Shell elliptical, rather inflated, very inequilateral, subbiangular and com- 

 pressed behind; substance of the shell rather thick; beaks scarcely prominent; 

 ligament rather short and thin; epidermis smooth, shining, yellowish brown, 

 very dark on the posterior slope; cardinal teeth very small, double in the right, 

 and single in the left valve; lateral teeth long and curved; anterior cicatrices 

 confluent; posterior cicatrices confluent; dorsal cicatrices placed under the plate 

 between the cardinal and lateral teeth; cavity of the shell rather deep; cavity 

 of the beaks rather shallow; nacre white and iridescent. 



Remarks. — This species has in its exterior somewhat the appearance of a 

 small Anodonta JlumafAlis, (nobis.) The posterior and dorsal margins are sinu- 

 ous. The first grown is large. The second and third are approximate. The 

 beaks of the only specimen I have before me are eroded, but the small undula- 

 tions visible on the posterior slope induce me to believe that when perfect indi- 

 viduals are observed, the tip will be found to be finely undulate. The cardinal 

 teeth are remarkably small. 



Unio orientalis. Plate 18, Fig. 38. 



Testa transversa, subinjlata, valde inaquilaterali ; valvulis suhcrassis; natibus subprominentibus, ad 

 apices undulatis; epidermide luted, nitidd; dentibus cardinalibus longis ; lateralibus longis sub- 

 curvisque; margarita alba et iridescente- 



Shell wide, somewhat inflated, very inequilateral ; valves somewhat thick ; beaks slightly prominent, 

 undulate at the tip; epidermis yellow, shining; cardinal teeth long; lateral teeth long and somewhat curved; 

 nacre white and iridescent. 



Hab. Java.? G. Von den Busch, M. D. 



My Cabinet, and Cabinet of Dr. Von den Busch. 

 Diam. .4, Length .7, Breadth 1.5 inches. 



Shell wide, somewhat inflated, very inequilateral, angular on the u.mbonial 

 slope, substance of the shell somewhat thick; beaks slightly prominent, with 

 small undulations at the tip; umbonial slope with two raised lines and two yel- 

 low rays on each valve diverging from the beak; ligament rather long and thin ; 



