﻿234 CKISTARIA 



ish-ycllow, sometimes with iiuJistiiicl, darker, concentric bands; 

 left valve with a small, lamellar pseudocardinal and one or 

 two blnrred, lamellar laterals ; right valve with one pseudo- 

 cardinal, with vestij:^es of one or two above it and a single 

 delicate lateral ; beak cavities shallow, with one or two faint 

 scars ; muscle scars shallow and indistinct ; nacre bluish-white, 

 somewhat iridescent and having a wide, prismatic border. 



Length 55, height 34, diam. 20 mm. 



I'onkin ; Cambodia. 

 Anodonta szvinhoei II. Adams, Proc. Zool. Soc. Lond., 1866, 



p. 446. — Clkssin, Conch. Cab. .Anodonta, 1876, p. 125, pi. 



i.xxv, fig. 6. 

 Anodon szvinhoei Sowekbv, Conch. Icon., XV'l, 1868, pi. xxvn, 



fig. 108. 

 Cristaria szt'inhoci SiMrsox, Syn., 1900, p. 586. 

 Pletholophus swinhoei Prdston, Rec. Ind. Mus., VII, 191 2, p. 



281. 



.\ species that evidently stands close to C. discoidea and C. 

 gentiliana. It is rather more infiated and elongated than the 

 former, and has more completely developed hinge teeth than 

 either. The laterals of this species are sometimes split up as 

 in Syiiihhyiiota conipressa. 



Cki.stari.\ inangu].ata Haas. 



"Shell short-elliptical, nearly unwinged, rather thin and in- 

 flated, rounded in front and behind. Posterior ridge rounded, 

 low. Basal margin regularly curved. Beaks not prominent, 

 situated at 35/100 of the total length, with low, wide ridges 

 grouped round an apical protuberance, the first ones doubly 

 looped, the following ones beconiing slightly undulate. Epi- 

 dermis greenish-brown, shining, rayed. Hinge consisting of 

 a single, low, lamellar prcT?umbonal, and a single, low, nearly 

 reduced, postumbonal claustrum in each valve, .\nterior cica- 

 trices faint, that of the anterior adductor and that of the an- 

 terior retractor confluent. Posterior cicatrices confluent, faint ; 

 2-3 dorsal cicatrices lying in a row, often united in a groove, 



