NODULARIA 977 
bluish-white. Epidermis green or yellow, on the wrinkles 
yellowish-brown to brown, eroded on the beaks. 
Length 38, height 19.5, diam. 16 mm.” (Haas). 
Type locality, Hunan, Central China. 
Nodularia persculpta Haas, Nachr. Deutsch. Mal. Ges., 1910, 
p. 98; Con. Cab., Unio, 1910, p. 105, pl. x, figs. 4-7. . 
Group of Nodularia sagittaria. 
Shell elongated, the hinder point above the middle of the 
shell, with a sharp posterior ridge and a faint ridge above it; 
beaks rather low, their sculpture irregularly radial; disks 
finely concentrically striate, not otherwise sculptured; epider- 
mis yellowish-olive, cloth-like; pseudocardinals greatly elon- 
gated, compressed sometimes dentellate under the beaks; lat- 
erals long, compressed. Animal unknown. 
NopULARIA SAGITTARTA (Lea). 
Shell elongated, subinflated, subsolid, inequilateral; beaks 
not greatly elevated; posterior ridge rounded or feebly bian- 
gulate, sometimes there are two slightly pinched-up ridges, 
ending in a point above the median line; dorsal and ventral 
outlines nearly parallel; anterior end rounded, sometimes sub- 
angular above; post-basal region but slightly produced, grad- 
ually curved up to the much-produced posterior point; surface 
with irregular growth lines but not otherwise sculptured; epi- 
dermis grayish or yellowish-olive to greenish-olive; teeth 
lamellar, rather feeble, the pseudocardinals sometimes slightly 
dentellate under the beaks; muscle scars shallow; nacre sil- 
very and iridescent. 
Length 50, height 18, diam. 14 mm. 
Siam ; Cambodia. 
Unio sagittarius Lea, Pr. Ac. N. Sci. Phila., VIII, 1856, p. 93; 
iss coUN<} Sct veitia.. Uh te57 ps 206, pl. xvi, fier 12 5 
Ops; VI, 1857, po £6, pl. xxvii, fie. 12. 
Margaron (Unio) sagittarius Lea, Syn., 1870, p. 58. 
Nodularia sagittaria Simpson, Syn., 1900, p. 811. 
Oxynaia sagittaria Haas, Con. Cab., Unio, 1910, pl. xv, figs. 
4-6. 
