136 UNIONIDjE. 



Original description : Shell narrow, elongated, very tumid, very 

 thick, covered with a black, smooth epidermis, white within, 

 anterior teeth large, jagged, posterior teeth 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. 



No dimensions are given with the description, but the following 

 are taken from Sowerby's figure. 



Long. 35*5, lat. 99 mm. 



Hob. India. 



267. Nodularia (Nodularia) caeruleus (Lea). 



Nodularia (Nodularia) caruleus (Lea) ; Simpson, Syn. Naiades, 



Washington, D.C., Smiths. Inst, Nat. Mus. Proc. xxii, 1900, 



pp. 811,812. 

 Unto ccendeus, Lea, Philadelphia, Pa., Trans. Amer. Phil. Soc. iv, 



p. 95, pi. 13, tig. 25 ; Obs. on Uniouidae, i, p. 105, pi. 13, 



fig. 25. 



Margarita ( Unio) cceruleus, Lea, Syn. 1836, p. 26 ; 1838, p. 20. 

 Margaron (Unio) cantleus, Lea, Syn. 1852, p. 30; 1870, p. 47. 

 Unio gerbidoni, Eydoux, in Guer. Mag. de Zool. 1838, p. 9, pi. 118, 



tigs. 2, 2 , 2 b ; H. & T., C. I. 1876, p. 6, pi. 12, tig. 2. 

 Unio substriatus, Lea, Proc. Acad. Nat. Sci. Philadelphia, viii, 



1856, p. 93 ; Obs. on UnionidaB, vi, 1857, p. 20, pi. 26, tig. 14. 

 Margaron ( Unio) substriatus, Lea, Syn. 1870, p. 47. 

 Unio humiiis, Lea, Proc. Acad. Nat. Sci. Philadelphia, viii, 1856, 



p. 93; Obs. on Unionidae, vi, 1857, p. 16, pi. 26, tig. 10. 

 Margaron ( Unio) humiiis, Lea, Syn. 1870. p. 32. 

 Unio corrianus, Kiister, Conch.-Cab., Unio, 1861, p. 229, pi. 67, 



tig. 5. 

 Unio leioma, Benson, A. M. N. II. 1862, p. 192 ; H. & T., C. I. 



1876, p. 6, pi. 12, fijf. 6. 

 Unio pilatus, Lea, Proc. Acad. Nat. Sci. Philadelphia, x, 1866, 



p. 133; Journ. Acad. Nat. Sci. Philadelphia, vi, 1868, p. 181, 



pi. 38, tig. 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, Couch. Icon, xvi, pi. 65, fig. 331. 



Original description : Testa angusto-elliptica, transversa, inaequi- 

 laterali, subcylindracea ; valvulis tenuibus ; natibus prominulis, 

 rotundatis ; dentibus cardinalibus lamelliformibus, et in dextra 

 valvula sola duplicibus ; lateralibus rectis margarita casruleo-alba 

 et iridescente. 



Ha b. Eiver Hooghly. 



To the above locality may be added the following, from which 

 specimens are represented in the Indian Museum, Calcutta : Eam- 

 pur; Siliguri ; Patna; Jamalpur, Phenchooganj, Central Sylhet; 

 Barrack Eiver, Silchar ; Darjiling ; Kochk ; Rajputana ; Maub- 

 hoom; Eohri, Sukkur District, Siud; Saharumpur, United 

 Provinces ; Lower Nerbudda ; Sambalpur, Bengal ; Bhagulpur ; 

 Kajmahal ; Umballa; Poonassa; Burwani; Bagh ; Hazrapur. 



