AND OTHER FAMILIES. 47 



also more straight on the dorsal margin. The smoothness and polish, 

 as well as the brightness of the green of some of the specimens are 

 very remarkable. 



Anodonta Stewartiana, Plate VI. fig. 17. 



»• 



Testa rotundato-ovatu, valde inflatd ; valvulis pertenuibus ; epidermide subas- 

 perd, tenebroso-viridi, natibus prominent ibtts, apicibus granulatis ; cicatricibus 

 subobsoletis aut vix perspicuis ; margarita cceruleo-albd. 



Shell rotundo-ovate, much inflated ; valves very thin ; epidermis roughish, olive 

 green ; beaks prominent and granulate at tip ; cicatrices scarcely perceptible ; nacre 

 bluish white. 



Hab. River Teche, Louisiana. W. M. Stewart. 



My Cabinet. 

 Cabinet of the Academy of Natural Sciences of Philadelphia. 

 Cabinet of Mr Stewart. 

 Diam. 1*8, Length 2, Breadth 3-1 inches. 



Shell rotundo-ovate, much inflated, subangular behind ; dorsal line 

 slightly curved ; substance of the shell thin ; epidermis somewhat 

 rough, olive green and obsoletely rayed ; beaks prominent, granulate 

 at tip in a short double series ; cicatrices scarcely perceptible : cavity 

 of the beaks deep and incurved ; cavity of the disk deep and rounded ; 

 nacre bluish white and iridescent, sometimes tinged with salmon co- 

 lour about the region of the beaks. 



Remarks. — I owe this species with numerous others to my friend 

 Mr Stewart who procured and gave it to me more than two years since. 

 I did not then describe it, although I believed it to be new, intending 

 it to accompany some others which are now embodied in this memoir. 

 It is an interesting species, being much inflated — the young specimens 

 approached the globose form. It is most similar in form to the 

 gibbosa (Say), but is perhaps less inflated, does not possess a polished 

 epidermis, and has granulations at the termination of the beaks, while 

 the gihbosa has undulations. The inflation of the Stewartiana is more 



