﻿4l6 ANODONTA 



hind ; posterior ridj^e fully rounded, curved down in the mid- 

 dle, ending in a [nmM heliind at the median line; post-dorsal 

 wing' hii^h, cut olT behind by an incurved truncation ; base 

 much rounded ; upper anterior part slii;htly angled ; surface 

 with low, wide, concentric ridges, olive-colored; nacre bright, 

 iridescent. 



Length i i i. height 85. diam. 50 mm. 



Xorth China. 

 Anodonta imdulifcra Ci.icssix, Conch. Cab. Ano.. 1876, p. 2t,t^, 



pi. Lxxvi, figs. I. 2. — SiMi\soN, Syn., 1900. p. 641. 



A large, finely-develoi^ed fomi with very full, high beaks, a 

 ■decided wing, and low. wide, concentric ridges. It is jjrob- 

 ably close to . /. woodimia. 



Anodonta iikuuki Xeumayr. 



"Shell thin, inequilateral, approaching elliptical, wider be- 

 hind, inflated, with strong growth-lines ; beaks tlat, not prom- 

 inent, wrinkled, somewhat eroded, situated anteriorly at 1/3 

 .of the length ; dorsal margin not very long, quite straight, 

 slightly angled where it passes into the rounded anterior mar- 

 gin ; basal margin very slightly curved ; posterior margin ob- 

 liquely truncate. Posterior slope bounded by a distinct keel 

 with two lines above it. Epidermis olive-brown. Nacre yel- 

 lowish with violet zones." ( Xeunia\r.) 



Type locahty, unknown. 

 Anodonta Jicudci Nkumayr, Ergebnisse d. Reise Szecheny Os- 



asien, IT. 1898. p. 647. pi. i, fig. 2. 



■'Although this sjiecies has many near relatives, it is not 

 identical with any of them. Anodonta arccrformls Heude. 

 though very close, is nearly e(|uilateral. the dorsal margin is 

 much longer and has no ]50sterior ridge, .hiodonta siibtctra- 

 iiona also has great resemblance, but in that the keel bounding 

 the posterior is nuicli stronger and the beaks are not wrinkled." 



Croup of Anodonta arcccforniis. 



Shell elliptical, with the dorsal and ventral lines parallel, 

 greatlv inflated, rounded in front, pointed and having a slight 

 dorsal w ing l)ehind ; umbonal region full, but the beaks flat- 



