t^^l

136 UNIONID^.
Original description :—Shell narrow, elongated, v.ery tumid, very
thick, covered with a black, smooth epidermis, white within,
anterior teeth large, jagged, posterior teetli laminar, elongated;
posterior side oblique, angular, acuminated at the end of the
angle, ventral margin slightly swelled posteriorly, then contracted,
straight in the middle; anterior side very short, umbones large.
iSfo dimensions are given with the description, but the following
are taken from Sowerby's figure.
Long. 35'5, lat. 99 mm.
Jlab. India.
267. Nodularia (Nodularia) cseruleus (Lea).
Nochdaria (Nodularia) ccerideus (Lea); Simpson, Syn. Naiades,
Washington, D.C, Smiths. Inst., Nat. Mus. Proc. xxii, 1900,
pp. 811, 812.
TJnio ccendeus, Lea, Philadelphia, Pa., Trans. Amer. Phil. Soc. iv,
p. 95, pi. 13, fig. 25; Obs. on Unionidoe, i, p. 105, pi. 13,
fig. 25.
Margarita ( TJnio) cceruleus, Lea, Syn. 1836, p. 26; 1838, p. 20.
Margaron (Unto) carideus, Lea, Syn. 1852, p. 30; 1870, p. 47.
Unio gerbidoni, Eydoux, in Guer. Mag. de Zool. 1838, p. 9, pi. 118,
figs. 2, 2 a, 2 6 ; H. & T., C. 1.1876, p. 6, pi. 12, fig. 2.
Unio substriatus, Lea, Proc. Acad. ISIat. Sci. Philadelphia, viii,
1856, p. 93; Obs. on Unionida;, vi, 1867, p. 20, pi. 26, fig. 14.
Margaron (Unio) substriatus, Lea, Syn. 1870, p. 47.
Unio humilis, Lea, Proc. Acad. Nat. Sci. Philadelpliia, viii, 1856,
p. 93; Obs. on Unionidffi, vi, 1857, p. 16, pi. 26, tig. 10.
Margaron ( Unio) humilis, Lea, Syn. 1870. p. 32.
Unio corrianus, Kuster, Conch.-Cab., Unio, 1861, p. 229, pi. 67,
fig. 5.
Unio leioma, Benson, A. M. N. II. 1862, p. 192 ; H. & T., 0. L
1876, p. 6, pi. 12, fig. 6.
Unio pilatus, Lea, Proc. Acad. Nat. Sci. Philadelphia, x, 1866,
p. 133; Journ. Acad. Nat. Sci. Philadelphia, vi, 1868, p. 181,
pi. 38, fig. 95.
Margaron (Unio) pilatus, Lea, Syn. 1870, p.47.
Unio evittatus, Lea, Proc. Acad. Nat. Sci. Philadelphia, 1868,
p. 133; Lea, Journ. Acad. Nat. Sci. Philadelphia, vi, 1868,
p. 279, pi. 38, fig. 92.
Margaron (Unio) cristatus. Lea, Syn. 1870, p. 47.
Unio trirostris, Sowerby, Conch. Icon, xvi, pi. 65, fig. 331.
Original description:—Testa angusto-elliptica, transversa, inaequilaterali,
subcylindracea; valvulis tenuibus ; natibus prominulis,
rotundatis; dentibus cardinalibus lamelliformibus, at in dextra
valvula sola duplicibus; lateralibiis rectis margarita cseruleo-alba
et iridesceute.
Ilab. Eiver Hooghly.
To the above locality may be added the following, from which
specimens are represented in the Indian Museum, Calcutta: Sampur;
Siliguri; Patna; Jamalpur, Phenchooganj, Central Sylhet;
Barrack Kiver, Silchar; Darjiling; Kochk ; Rajputana ; Manblioom;
Eohri, Sukkur District, Slud; Saharumpur, United
Provinces; Lower Nerbudda; Sarabalpur, Bengal; Bhagulpur ;
Eajmahal; TJmballa; Poonassa; Burwani; Bagh ; Hazrapur.