﻿ANODONTA 



407 



Anodonta richthofcni Neumayr, Ergebnisse d. Reise Szecheny 

 Ostasien. II, i8c)8, p. 646, pi. i, fig- i- 



"There has been described from China a considerable num- 

 ber of large Anodontas, which are related to each other and 

 to 4n richthofcni. It is possible that one workmg at leisure 

 and with a greater amount of material would find many con- 

 necting links and be able to unite many forms as varieties of 

 a common type, but for me, with the small amount of material 

 that I have, this is impossible; I must follow the accepted sys- 

 tematic arrangement and deal with the species in accordance 

 with it An. richthofem agrees with none of the described 

 species- from An. cdulis Heude it differs by its greater thick- 

 ness more inflated umbonal region and better developed wing. 

 4n 'sccurifonnis Heude appears still nearer, but the inflation 

 of the umbonal region is smaller, the beaks project more for- 

 ward, and are not wrinkled, the antero-dorsal angle is more 

 n^arked and the wing less developed. An. pac.iica Heude is 

 proportionatelv less high, has smooth beaks and a reddish- 

 brown epidermis. An. tumida Heude is proportionally inflated, 

 the epidermis is olive-brown and the nacre has flesh-colored 

 and violet bands. An. succinca Heu,de has sharp, smooth 

 beaks, keeled posterior slope, a sharp pointed hinder end and 

 a ch;stnut-colored epidermis. An. scaphrduun Heude and 

 puerorum Heude differ entirely." 



Probably one of the many mutations of A. zvoodiana. 



Anodonta fenouilii (Heude). 



Shell rather short, subinflated, subovate, with a well-devel- 

 op;d dorsal wing, which joins the incurved t-"-^-; °\^;^ 

 posterior slope with a decided angle-: posterior ridge low. 

 Zuy double' ending in a wide biangulation on te median 

 line; beaks low, their sculpture not seen, but described b> the 

 author of the species as obscurely sulcate and widely orru- 

 r ed- surface with stronglv marked growth lines epidernn. 

 b ownish or ashy-brown, rayless ; nacre lurid whitish remark 

 ably thickened in front, especially outside the palhal line, the 



