﻿370 ANOnONTA 



ogists has named c\crv conceivable variation, and in very many 

 cases distorted individuals. luiro])e is a densely settled region, 

 and it is possible that the waters of the streams and ponds in 

 many ])laces may be so affected by sewage and other offal as 

 to produce many changes in the mollusks living in them. 



Anudox'i'a KicTTiCKi Drouct. 



Shell large, subovate or subrhomboid. inflated, solid, irreg- 

 ularly marked with growth stride ; epidermis lamellated at the 

 border, shining, brown-olive, somewhat yellow below ; dorsal 

 line slightly curved ; dorsal wing low ; posterior slope ol)li(iuely 

 truncate, the hinder end of the shell widely rounded ; anterior 

 end evenly rounded : basal line incurved behind the middle ; 

 beaks rather full, finely plicate, reddish; muscle scars large; 

 nacre milky-white. 



Length 125, height 70, diam. 50 mm. 



Length 145, height 80, diam. 50 mm. 



Pond in the j^alace of the governor of Samarcand, Turke- 

 stan. 

 Anodoula rcttcri Dkoukt, J. de Conch.. XL\ 11. 1809. P- 4^2, 



fig. — Simpson, Syn.. upo, p. 627. 



This seems quite close to the var. piscinalis of Anodonta 

 cygtwa, but Drouet remarks that it is in certain places 4 milli- 

 meters in thickness. 



Anodonta i.ucasi Deshayes. 



Shell elongated, shining, subelliptical or subrhomboid, some- 

 what inflated, of moderate solidity, inequilateral, with rather 

 full, high beaks for a member of the grouj), their sculpture 

 not observed; posterior ridge full, rounded: dorsal wing some- 

 what developed and angled in young shells, low and hardly 

 angled in old ones : posterior slope subtruncate above, rounded 

 below, dorsal and ventral outlines nearly par;illel ; anterior end 

 a little narrowed, rounded ; epidermis brownish in old shells, 

 pale yellowish-green with brown concentric bands and feeble 

 ravs in young shells; nacre bright, bluish-white. 



TvCngth T14. height 62. diam. T,y mm. 



.'\ltriers. 



