NODULARIA 1009 
radial plications on the dorsal slope; epidermis dark tawny- 
greenish or brownish with a smoky tint, with one or two pos- 
terior rays, somewhat shining; teeth compressed, the laterals 
curved; muscle scars not deep; nacre bluish-white. 
Length 58, height 33, diam. 24 mm. 
Sumatra. 
Unio sumatrensis Lea, Pr. Ac. N. Sci. Phila., III, 1859, p. 
los. hence Nel ehia.. LV, TO00, p. 230, pl xxxiv, fig. 
118; Obs., VII, 1860, p. 57 pl. xxxiv, fig. 118. 
Margaron (Unio) dimotus LEA, Syn., 1870, p. 30. 
Nodularia dimota SIMPSON, Syn., 1900, p. 818. 
Contradens dimotus Haas, Conch. Cab., Unio, 1912, pl. 19, 
figs. I-5. 
Unio hageni StRuBELL, Nachr. Deutsch. Mal. Ges. 1897, p. 10. 
Unio hagnei Simpson, Syn., 1900, p. 862. 
Rather solider, more inflated and darker colored than N. con- 
tradens. ‘The sculpture is peculiar, and generally more pro- 
nounced than in contradens. 
Changed to dimotus by Lea because sumatrensis was pre- 
occupied for a Unio by Dunker. 
NODULARIA FISCHERIANIA (Morlet). 
Shell subrhomboid, inflated, rather solid, inequilateral ; 
beaks moderately full and high; posterior ridge well develop- 
ed, subangular above, double below, ending in a biangulation 
at and below the median line; anterior end a little narrowed, 
rounded, somewhat angulate above; base line lightly curved, 
full behind the middle; dorsal line curved; dorsal slope 
obliquely and decidedly truncated; surface nearly smooth; 
olive-green with lighter bands; teeth much compressed, lam- 
ellar; muscle scars well marked; nacre bluish-white, yellowish 
in the cavities. 
Length 58, height 33, diam. 27 mm. 
Cambodia. 
Unio fischerianus Morir, Jl. de Conch., XX XI, 1883, p. 109, 
pl. tv, fig. 6. 
Nodularia fischeriana Simpson, Syn., 1900, p. 818. 
