996 . NODULARIA 
epidermis greenish straw-colored, with narrow, broken, green 
bands and zigzag, green markings, very smooth and shining; 
teeth compressed; beak cavities rather deep; anterior scars 
impressed ; nacre bluish-white, silvery. 
Length 27, height 13, diam. 11 mm. 
Siam. 
Unio phaselus Lea, Pr..Ac. N. Sci. Phila., VIII, 1856, p. 94; 
Obs; VI; 1857) px 17) pl. xx fig. 11; Ja Ae Ne Sel. ila: 
IIT, 1858, p.207, pl. xxvi, fig. Tr. 
Margaron (Unio) phaselus Lea, Syn., 1870, p. 32. 
Nodularia phaselus Stimpson, Syn., 1900, p. 815.—HAaas, Con. 
Cab.,-Wnio; 1910; po Lily ph «xs fe ie, 
I have seen but a single shell of this species, the type, and 
it seems nearly related to NV. crispata. Its smooth surface and 
shining, greenish-yellow epidermis, marked with rich green, 
distinguish it from any allied species. 
NopuLAria ScoBina (Hanley). 
Shell decidedly rhomboid, subcompressed, rather solid, in- 
equilateral ; beaks only moderately full or high; posterior ridge 
well developed, sometimes slightly double, ending in a point 
or faint biangulation near the base of the shell; anterior end 
rounded; base line nearly straight, slightly incurved in the 
middle, a little inflated near the posterior end; dorsal slope 
obliquely subtruncate; surface covered with raised, more or 
less broken, subradial, somewhat zigzag corrugations, in some 
places resembling a worn rasp; epidermis greenish, with a dark 
green ray on the dorsal slope; pseudocardinals somewhat 
rudimentary ; nacre bluish, iridescent behind. 
Length 32, height 17 mm. 
Assam. 
Unio scobina Han ey, Biv. Shells, 1856, p. 382, pl. xx, fig. 
40.—HAnN try and Turorayp, Conch. Ind., 1876, p. 22, pl. 
XLVil, des. ae 
Nodularia scobina Simpson, Syn., 1900, p. 816. 
The shell of this species, according to the figures and de- 
scription, is shaped a good deal like that of N. fluctigera, but is 
more solid, has more broken sculpture and is not so elongated. 
According to Hanley and Theobald it is very rare. 
