﻿4lS ANODONTA 



Anodouta arcccfoniiis var. flavotincta vox Martens, Zool. 



jalirb. Suppl.. \"III. 1905, p. 64, pi. II, fig:. 4. 



"Compared witli otlicr shells of the same size and for its 

 actual size very thick-shelled, and conse(iuently the sjiecimens 

 cannot be considered to be youns^ shells ; the i)eculiar yellow 

 band on the inside is ])resent in all the specimens, thouj^h dif- 

 fering in intensity; IJeude mentions nothing of the kind in 

 his description of arca-formis. The fact that the wing is not 

 angulated at the end, as in Heude's figure and in our speci- 

 men, shows that this is not the young of that species, as in the 

 Anodons the rule is settled that in the young the wing is 

 stronger than in the adult. 



A very similar specimen is in the 1 Berlin Museum from 

 Ning[:)0 in Central China, but somewhat larger, 54 mm. long, 

 with a darker, greener and rather shining epidermis, the yel- 

 low band is clearly shown ; this chiefly jirevents me from de- 

 scribing f!ai oti)icta as a species. One s]:)ecimen from Kcum- 

 gang has on the posterior half of the shell, near the l)asal mar- 

 gin, a spot I T mm. long and 7 mm. high, with six flat, vertical 

 ridges around it, se])arated only by small grooves ; this also 

 appears on the interior of the shell." 



Group of Anodouta ^randis. 



Shell oval, inflated, with a slight post-dorsal wing; umbonal 

 region inflated ; beak sculpture consisting of several coarse, 

 irregular, often broken, ridges, which are more or less doubly 

 looped and generally nodulous, especially at the bases of the 

 loops; epidermis usually rather smooth. 



Animal having the gills large, inner the larger, especially in 

 front, free nearlv or quite the entire length of the abdominal 

 sac ; palpi large and long ; mantle much thickened at the border. 



AXODONTA GRANDIS Say. 



Shell long ovate, subrhomboid or subelliptical, generally 

 rather strong, subinflated, inequilateral ; beaks usually full and 

 more or less elevated above the dorsal line, their sculpture con- 

 sistinsr of a few strong, irregular, broken ridges, which are 



