﻿CRIST/\KIA 



231 



Atwdonta ch'mensis Kusti;k, Conch. Cab. Ano., 1853, p. 51, pi. 



XII, fig. 3. 

 Unio magniUcus Sowerry, Conch. Icon., XVI, 1867, pi. lvii, 



fig. 289. 

 Anodonta gruneriana Clkssin, Conch. Cab. Ano., 1875, P- ^7^> 



pi. i,vi, figs. 3, 4. 



There are often one or two dark rays on the posterior 

 slope. It is a very neat shell and is sometimes so nearly des- 

 titute of teeth that it is taken for an Anodonta. Gray's and 

 Lea's names were published in the same year and I have no 

 means of knowing which appeared first. 



Var. sautteri Haas. 



"Differs from typical discoidea by the strongly developed 

 ciaustra, which are double in the left valve in their praeumbonal 

 as well as in their postumbonal portion." (Haas.) 



Type locality, Lake Candidins, Formosa. 

 Cristaria discoidea sautteri Haas, Ann. Mag. Nat. Hist., (8), 



YI, 1910, p. 499. 



CuiSTAKiA PARVULA (Heudc). 



Shell thin, small, long elliptical or obovate, subcompressed, 

 rounded in front, with a small post-dorsal wing, which in well- 

 preserved shells is angled behind ; posterior ridge low, scarcely 

 biangulate ; beaks low and subcompressed, their sculpture a 

 few longitudinal bars parallel to the dorsal line ; surface with 

 fine concentric growth marks, brownish or olive, rayless ; pli- 

 cations of the posterior slope faint ; left valve with a single, 

 very faint, long and curved pseudocardinal and one low faint 

 lateral ; right valve with two feeble pseudocardinals and a 

 single lateral ; muscle scars faint ; nacre bluish or purplish, 

 iridescent. 



Length 58, height 34, diam. 18 mm. 



Kien-te sud ; Canton River, China. 

 Dipsas parvulus Hejude (part), Conch. Fluv. Nank., IV, 1878, 



pi. XXXII, fig. 65. 

 Barbala parvida P^tel, Conch. Sam., HI, 1890, p. 175. 

 Cristaria parvtda Simpson, Syn., 1900, p. 585. 



