QUADRULA 923 
QUADRULA MORELETIANA (Heude). 
Shell ovate, very heavy, subcompressed; beaks but slightly 
elevated, placed at the upper part of the anterior end, but not 
terminal ; anterior end widely and almost evenly rounded; post- 
dorsal and basal lines evenly curved; posterior end narrowed 
and somewhat rounded; surface with subobsolete, concentric 
ridges, covered with scattered, coarse nodules, and having a 
few curved, subnodulous ridges on the posterior slope; epi- 
dermis brownish-chestnut; pseudocardinals somewhat elon- 
gated, slightly curved; laterals with vertical striation; beak 
cavities deep, compressed; nacre dirty white. 
Length 80, height 55, diam. 40 mm. 
River Konang-té-tcheou, China. 
Unio moreletianus Hrupr, Conch. Fluv. Nank., VIII, 1883, 
eins pi Kees er 
Quadrula konangensis SIMPSON, Syn., 1900, p. 799. 
The outline of this species is almost exactly egg-shaped, and 
the species differs from all allied forms in this character. In 
the Synopsis I changed Heude’s name moreletianus to konan- 
gensis because the name moreleti had been previously applied 
to a Unio by Deshayes. But as the two names differ slightly, 
it is probably better that Heude’s name should stand. 
QUADRULA PoLysticra (Heude). 
Shell somewhat rhomboid in outline, moderately inflated, 
solid; beaks high, full, terminal; anterior end cut away slop- 
ingly below, rounded where it joins the straight or lightly 
curved base; outline of dorsal slope raised to a low angle be- 
hind the ligament; posterior ridge well-developed, subangular ; 
surface covered with rather close, large tubercles; dorsal slope 
with curved, subnodulous ridges; epidermis light brownish, 
somewhat silky; pseudocardinals elongated, radial, curved, 
more or less split; laterals vertically striate ; beak cavities very 
deep; anterior muscle scars small, deep; nacre dirty white, 
thinner behind. 
Length 82, height 58, diam. 36 mm. 
China. 
