946 CUNEOPSIS 
ged; muscle scars deep, the posterior ones oblique and elon- 
gated ; beak cavities deep, compressed ; nacre white. 
Length 70, height 33, diam. 24 mm. 
China. 
Unio heudei Arupe (Bazin manuscript), Jl. de Conch., XXII, 
1874, p. 114. 
Cuneopsis heudei Stmpson, Syn., 1900, p. 805. 
Unio corderii Heupr, Conch.,-Fluv. Nank., I, 1875, pl. 1, fig. 3. 
This species bears a strong superficial resemblance to the 
Unio pazi lea, but is much solider and has deeper beak cavi- 
ties and totally different teeth. The beak sculpture, which is 
somewhat eroded in the specimens examined, seems most like 
that of the Pleurobemas. The National Museum specimens 
gape slightly behind, but are not bent to the right or left. 
CUNEOPSIS CELTIFORMIS (Heude). 
Shell much elongated, slightly inequivalve, inequilateral, 
solid, wedge-shaped, inflated; beaks full and elevated in old 
shells; posterior ridge low, rounded, close to the dorsal line; 
anterior end rounded; base line nearly or quite straight, some- 
times rather full towards the posterior end; dorsal line straight 
or lightly curved; the hinder end of the shell pointed; surface 
with numerous, low, concentric ridges; epidermis light green- 
ish brown in the young state, dark brown when old, silky ; 
left valve with a compressed anterior pseudocardinal, which 
is more or less united to an elongated, triangular posterior one, 
and below and between them there is a deep socket; right valve 
with one elevated, rather solid, pseudocardinal, pseudocardinals 
recurved; laterals two in the left valve and one in the right; 
anterior scars large, deep and rough; posterior scars oblique, 
impressed ; beak cavities very deep, compressed; nacre white, 
thinner behind. 
Length 117, height 38, diam. 31 mm. 
China. 
Unio celtiformis Hrupx, Jl. de Conch., XXII, 1874, p. 113; 
Conch., Fluv., Nank., I, 1875, pl. 1, fig. 4. 
Cuneopsis celtiformis Stmeson, Syn., 1900, p. 805. 
