NODULARIA 985 
are Deshayes’ U. anceps. The type of the former is not in his 
collection, but there are two authentic, larger specimens. These 
are much more inflated, are more elongated than anceps, and 
have three distinct posterior rays. ‘They are on the whole, 
less strongly sculptured than anceps. While it is possible that 
the two may run together, [ am inclined to believe them dis- 
tinct. 
NODULARIA occaTA (Lea). 
Shell subrhomboid, subcompressed, inequilateral, rather sol- 
id; beaks low and subcompressed, their sculpture consisting 
of radial and somewhat zigzag ridges, this sculpture extending 
over the whole shell and becoming somewhat granulous; an- 
terior end rounded; base line curved, slightly fuller near the 
posterior end; posterior ridge well developed, ending in a 
blunt point below the median line; dorsal slope obliquely, 
strongly truncate; surface covered with granular, concentric 
sculpture; epidermis dirty greenish, dull; pseudocardinals 
rather solid; laterals curved; anterior scars well impressed ; 
posterior scars shallow; nacre bluish-white, flesh-colored in 
the cavities, iridescent. 
Length 36, height 20, diam. 11 mm. 
India. 
Unio occatus, Lea, Pr. Ac. N. Sci. Phila., 1V, 1860, p. 307; 
jl. Ac. N. Sci. Phila.; VI, 1863, p. 398, pl. 1, fig. 304; Obs., 
X, 1863, p. 34, pl. L, fig. 304.—Sowersy, Conch. Icon., XVI, 
1868, pl. LXxIXx, fig. 412. 
Margaron (Unio) occatus Lea, Syn., 1870, p. 31. 
Nodularia occata SIMPSON, Syn., 1900, p. 813. 
Unio macilentus BENSON, Ann. and Mag., X, 1862, p. 187.— 
Hantey, and THroparp, Conch. Ind., 1876, p. 5, pl. x, figs. 
2, ASD. O62, DIL ICLIV, figs 5. 
Unio rugesus HANtEY and THrKoBaLp, Conch. Ind., 1876, p. 
62 pl. CLIV, Hees. 
More compressed than any of the allied species. It is a com- 
paratively short, rhomboid form, covered throughout with 
granular concentric ridges and traces of zigzag sculpture. 
