138 UXlOXIDiE. 



yellowish white ; hinge narrow, rather sinuous in the median part; 

 cardinal tooth lamellit'orm, carious somewhat oblique fitting into 

 the opposite valve between two small unequal teeth joined at 

 their base and denticulated above ; posterior lateral tooth lamelli- 

 t'orm, sharp, inserted in the opposite valve between two lamellae, 

 quite as narrow as that of the left valve ; muscular scars sub- 

 circular, the anterior rather deep, the posterior very superficial. 



Long. 22-.5, Lit. 40-5 mm. 



Ilah. Small streams and marshes of Bengal, it is found in great 

 profusion in the neighbourhood of Chandernagor. 



268. Nodularia (Nodularia) shurtleflBana (Lea). 



Notlularia (Noduktria) slmrtleffiana (Lea) ; Simpsou, Washington, 

 D.C, Smiths. Inst., Nat. Mus. Proc. xxii, p. 813. 



Unio shurtlejficmus, Lea, Proc. Acad. Nat. Sci, Philadelphia, 

 viii, 1856, p. 94 ; Obs. on Genus Unio, vi, p. 22, pi. 27, tig. 17 ; 

 Journ. Acad. Nat. Sci. Philadelphia, iii, p. 802. 



Margaron {TJnio) ><hnrtleffiamis, Lea, Syn. 1870, p. 32. 



Original descrij^iion : — Testa minute plicata, elliptica, inequi- 

 lateral!, subcylindracea, postice obtuse angulata, antice rotundata, 

 ad latus subplanulata ; valvulis subcrassis ; uatibus prominulis, ad 

 apices minute undulatis; epidermide virido-lutea ; dentibus car- 

 dinalibus sublongis, compressis geminisque ; lateralibus longis 

 subrectisque ; margarita salmonis colore tiucta et viridescente. 



Rah. Siria Eiver, India {Major Le Conte) ; Ahmednugger 

 (Shurtleff). 



There are also specimens in the Indian Museum which cannot 

 be separated from this species from Myadong and Shuaygoomyo, 

 Burma. It is of doubtful s])ecific rank, unfortunately very few 

 specimens have been available for examination ; probably, could a 

 large series be brought together, it would prove to be but a variety 

 of i\". cwndea. 



The dimensions of three specimens in the British Museum 

 which agree well with Lea's original figure and description are : — 



1. 2. 3. 



Long 24 22-5 20 mm. 



Lat 44 44 35 mm. 



Diam 14-25 15 12-75 mm. 



269. Nodularia (Nodularia) occata (Lea). 



Nodularia (Nodularia) vccata (Lea) ; Simpson, "Washington, B.C., 

 Smiths. Inst., Nat., Mus. Proc. xxii, 1900, p. 813. 



Unio occatus, Lea, I'roc. Acad. Nat. Sci. Philadelphia, iv, I860, 

 p. 307 ; Journ. Acad. Nat. Sci. Philadelphia, vi, 1863, p. 308, 

 pi. 50, tig. 304 ; Obs. on Genus Unio, x, 1863, p. 34, pi. 50, 

 tig. .304. 



