NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 641 



ANODONTA CALIPYGOS Kobelt. 



*Anodonta calipygos Kobelt, Abh. Senck. Nat. Ges., XI, 1879, p. 435, pi. xix, fig. 

 1.—* P/ETEL, C. Sam., Ill, 1890, p. 177.—'' von Ihering, Abh. Senck. Nat. 

 Ges., XVIII, 1893, p. 150. 



Japan. 



ANODONTA UNDULIFERA Clessin. 

 *Anodonta imdulifera Clessin, Concb. Cab. Ano., 1876, p. 233, pi. Lxxvi, figs. 1, 2. 

 China. 



(Group of Anodonta arcwformis.) 



Shell elliptical, with the dorsal and ventral lines parallel, greatly 

 inflated, rounded in front, pointed and having a slight dorsal wing 

 behind 5 umbonal region full, but the beaks flattened; the sculpture, 

 consisting of numerous ridges, curved in front and nearly following the 

 growth lines, then running backward in an almost straight line and 

 ending at the low ijosterior ridge. 



Animal unknown. 



fANQDONTA ARCiEFORMIS Heude. 



*Anodon arcwformis Heude, C. F. Nauk., Ill, 1877, pi. xix, fig. 40. 

 '^Anodonta arcwformis P^tel, C. Sam., Ill, 1890, p. 176. 



China. 



(Group of Anodonta grandis.) 



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 with large gills, inner the larger, especially in front, free 

 nearly or quite the entire length of the abdominal sac; palpi large and 

 long; mantle much thickened at the border. 



fANODONTA GRANDIS Say.' 



Anodonta grandis Say, N. Harm. Diss., II, 1829, p. 341. — ■" Coxkad, New F. W. 

 Shells, 1834, p. 73.—* Ferussac, Guer. Mag., 1835, p. 25.—* L. W. Say, Terr, 

 and Fluv. Shells, 1840, p. 12.— * Hanley, Test. Moll., 1842, p. 220; * Biv. 

 Shells, 1843, p. 220.— * Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 264.—* H, 

 and A. Adams, Gen. Eec. Moll., II, 1857, p. 502. — * Clessin, Conch. Cab. Ano., 

 1873, p. 96, pi. XXX, figs. 1, 2 — * B. H. Wright, Check List, 1888.—* Pjstel, 

 Conch. Sam., Ill, 1890, p. 180.—* Baker, Moll. Chicago, Pt. 1, 1898, p. 51, 

 pis. II, III, fig. 1; IV, fig. 1. 



1 A species having a very wide distribution and abundant in individuals. It is an 

 exceedingly variable form, and a large number of names have been bestowed on its 

 mutations, all of which seem to be closely connected. I have retained some of these 

 in a varietal sense. 



Proc. K. M. vol. xxii 41 



