﻿228 CK I STAR! A 



each valve, small and short ; beak cavities shallow, with one 

 or two muscle scars : adductor scars shallow ; nacre lurid, pur- 

 plish-white, often blotched. 



Length 170, height 112, diam. 67 mm. 



East Siberia ; Amurland ; North China. ? 

 Anodonta hcrculea MiDoeNDORFF, Bull. Phys. Math. Ac. St. 



Pet., VI, 1848, p. 303. — Sib. Reise, II, 1851, p. 278, pi. xxi, 



fig. 5; XXII, figs. 1, 2; XXVI, figs. I. 2. — Deshayes, Bull. 



Nouv. Arch. Mus., IX, 1873, p. i, pi. i, fig. i. 

 Anodonta (Dipsas) hercidea Cldssin, Conch. Cab. Ano., 1875, 



p. 175, pi. ijx, figs. I, 2. 

 Cristaria herculea von Ihering, Abb. Senck. Nat. Ges., XVIII, 



1893, P- 14'^^- — Simpson, Syn., 1900, p. 584. 

 Barbala hcrculea P.KTivi., Conch. Sam., Ill, 1890, p. 175. 

 Dipsas pliccita var. clcssini Kobelt, part, Abb. Senck. Nat. 



Ges., XI, 1879, p. 429, pi. XV. 



There is a fine specimen of this species in the National Mu- 

 seum collection said to come from Japan. It differs from C. 

 spatiosa in being shorter, more inflated, and in having a much 

 higiier ])osterior ridge, while the plications of the posterior 

 slope are more strongly developed than in that species. From 

 plicata it diiTers mucli in shape, being drawn out to a blunt, 

 rounded posterior ])oinl at the mcflian line ; it is far more in- 

 flated than that species, and has a higher posterior ridge. Its 

 posterior dorsal outline is somewhat incurved. 



Craspedodonta smaragdina Anton, Verz. der Conch., 1839, 

 p. 16, No. 592; Clessin, Conch. Cab. Ano., 1875, P- 93- P^- 

 XXVII, fig. 2 ; a badlv figured little shell, said to come from 

 North America ; may be a young C. hcrculea. 



Ckistaria spatiosa (Clessin). 



Shell enormously large, irregularly long ovate, with a slight 

 wing behind, subsolid, somewhat inflated, gaping before and 

 behind, with a full, widely rounded posterior ridge, which is 

 either straight or curved downward in the middle; the out- 

 line of the shell above the posterior slojie is incurved and it 

 ends in a wide, feeble biangulation behind ; beaks low, moder- 



