﻿232 CRISTARIA 



1 am (ioul)tful vvluthcM- this is more than a variety of T. 

 discoidca. tlie specimen fii^nred hy TIeiulc bcin^ a young shell. 

 I have seen a shell, which I believe is Heude's species, tha^ 

 differs from the young of C. discoidea in being darker colored, 

 a little rougher, and duller colored, in having longer, more 

 delicate and more curved i)scudocar(linals, and a little darker 

 nacre. . All the young of discoidea T have seen are slightly 

 biangulate behind : this is hardlv so. 



Cristaria RiiiNiANA vou Martens. 



Shell elliptical or slightly rhomiboid. rather thin, subcom- 

 pressed, with a small post-dorsal wing, which is straight above 

 and angular behind ; posterior ridge but slightly developed, 

 there being three faint darker ridges; beaks low and com-- 

 pressed, their sculpture consisting of feeble ridges parallel to 

 the dorsal line ; on the posterior slope there are sometimes a 

 few^ slight plications ; color greenish or brownish, sometimes 

 rayed ; there is a single rudimentary, linear pseudocardinal in 

 each valve and one slender lateral ; plications of the posterior 

 slope scarcely developed ; muscle scars shallow ; nacre bluish- 

 white. 



Length 55, height 35. diam. 18 mm. 



Length of largest National Museum shell 60, height 35, 

 diam. 18 mm. 



Japan. 

 Cristaria reiniana von Martens, Jahrb. Mai. Ges., II, 1875, 



p. 136, pi. Ill, fig. 4. — Simpson, Syn,.. 1900, p. 585. 

 ? Dipsas reiniana Kop.kt.t. Abb. Senck. Nat. Ges., XI, 1879,. 



p. 432. pi. XII. fig. 4 ; XXI, fig. 2. 

 Anodonta reiniana von Ihkring. Abh. Senck. Nat. Ges.. 



XVIII. 1893. p. 147. 

 Barhala reiniana P.t-:tki.. Conch. Sam., III. 1890, p. 175. 

 PletholopJnis reiniana Pki'STon, Rec. Ind. Mus., VII, 1912, p. 



281. 



The species is rather more rhomboid than C. discoidea, to 

 which it is nearlv related. 



