NODULARIA IOII 
inflated. Beak sculpture unknown on account of the great 
erosion. Area low. Hinge weak; two small, lamelliform 
cardinal teeth in the right valve, the lower stronger than the 
upper; one rather strong cardinal tooth in the left valve. 
Angle of the cardinal teeth 35°, of the lateral teeth 20°. Mus- 
cular impressions, anterior large, ear-shaped, not deep, poste- 
rior large, somewhat more shallow; dorsal impressions deep. 
Nacre porcellaneous, bluish-white. Epidermis chestnut-brown, 
strongly, but irregularly, furrowed. 
Length 81, height 56, diam. 37 mm.”’ (Haas). 
Type locality, New Guinea, (Fly River?). 
Microdontia ovata Haas, Nachr. Deutsch. Mal. Ges., 1910, p. 
100; Con. Cab. Unio, 191!0, pl. 16, fig. 5. 
NopULARIA SACELLUS (Drouet and Chaper). 
Shell irregularly rhomboid, thin, narrowed in front, inequi- 
lateral, convex; beaks only moderately full and high; dorsal 
line nearly straight; anterior end rounded; base curved and 
full behind the middle; dorsal slope almost squarely truncated ; 
posterior ridge well developed, somewhat double, ending in 
a feeble biangulation near the base of the shell; epidermis 
dirty brownish-green, sometimes banded; surface almost 
smooth, with a few faint plications on the dorsal slope; teeth 
very delicate, much compressed ; in each valve almost under the 
beaks there is a rounded tubercle; muscle scars shallow; nacre 
bluish, salmon in the cavities, iridescent behind. 
Length 55, height 35, diam. 18 mm. 
Borneo. 
Unio sacellus Drover and CuHaprrrR, Mem. Soc. Zool. Fr., V, 
1892, p. 148, pl. v, figs. 4-6. 
Nodularia sacellus Stmpson, Syn., 1900, p. 818. 
Contradens dimotus sacellus Haas, Conch. Cab., Unio, 1912, 
pl. 109, fig. 6. 
I was at first inclined to believe that this and the next spe- 
cies were merely varieties of the same thing, but close examina- 
tion reveals several minor differences. This species is a 
little higher in proportion to length, is more squarely truncate 
