﻿COLLETOPTERUM 439 



surface with delicate growth Hues ; epidermis brilliant, of a 

 clear yellow, reddish at the beaks and greenish at the post- 

 dorsal region, with a few rays ; nacre white, iridescent, hinge 

 arched, short. There is a small lamella in one valve which fits 

 into a groove in the other. 



Length 55, height 42, diam. 15 mm. 



Servia, at Belgrade. 

 Anodonta letourneuxi Bourgulgnat, Ann. Mai., I, 1870, p. 76. 

 Anodonta (Collctoptcnim) letourneuxi WesTicrlund, Faun. 



Pal., Pt. 7, 1890, p. 310. 

 Colletopterum letourneuxi Bourguignat, Mater. Moll. Aceph., 



1, 1881, p. 76.— Servain, Bull. Soc. Mai. Fr., VII, 1890, pi. 



VI, figs. I, 2. — Simpson, Syn., 1900, p. 649. 

 Anodonta piscinalis letourneuxi Kobeet, Icon., new ed., XVIII, 



I912, p. 47, pi. CCCCEXXI, figs. 2532-2534; pi. CCCCLXII, figS. 



2535-2538. 

 Anodonta prccclara Bourguignat, Ann. Mai., I, 1870, p. 78. 

 Anodonta (Colletopterum) prceclara Westerlund, Faun. Pal., 



Pt. 7, 1890, p. 310. 

 Colletopterum prccclarum Bourguignat, Mater. Moll. Aceph., 



I, 1881, p. 78.- — Simpson, Syn., 1900, p. 649. 

 Anodonta eximia I'ourguignat, Ann. Mai.. I, 1870, p. 80. 

 Anodonta (Colletopterum) eximia Westei^lund, Faun. Pal., 



Pt. 7, 1890, p. 310. 

 Colletopterum eximium Bourguignat, Mater. Moll. Aceph., 



I, 1881, p. 80. — Simpson, Syn., 1900, p. 649. 

 Anodonta tanousi Bourguignat, x\nn. Mai., I, 1870. 

 Anodonta (Colletopterum) tanousi Westerlund, Faun. Pal., 



Pt. 7, 1890, p. 311. 

 Colletopterum tanousi Bourguignat, Mater. Moll. Aceph., I, 



1881, p. 83. — Simpson, Syn., 1900, p. 649. 



The descriptions of the hinge of this shell given by authors 

 are rather vague and conflicting. According to Bourguignat 

 the hinge is practically edentulous, there being a feeble lamina 

 in one valve that fits into a socket in the other. It is quite 

 likely that the species is only a peculiar Anodonta and possibly 

 a form of .-^. cygnea. 



