138 UXIOSIDJE. 



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

 cardinal tooth lamelliform, carious somewhat oblique fitting into 

 the opposite valve between two small unequal teeth joined at 

 their base and denticulated above ; posterior lateral tooth lamelli- 

 form, 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, lat. 40'5 mm. 



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

 profusion in the neighbourhood of Chandernagor. 



268. Nodularia (Nodular ia) shurtleffiana (Lea}. 



Nodularia (Nodularia) shurtleffiana (Lea) ; Simpson, Washington, 

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



Unto shnrtlejfianus, Lea, Proc. Acad. Nat. Sci. Philadelphia, 

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

 Journ. Acad. Nat. Sci. Philadelphia, iii, p. 302. 



Margaron ( Unto) shurtleffianus, Lea, Syn. 1870, p. 32. 



Original description : Testa minute plicata, elliptica, insequi- 

 laterali, subcylindracea, postice obtuse angulata, antice rotundata, 

 ad latus subplanulata ; valvulis subcrassis ; natibus prominulis, ad 

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

 dinalibus sublongis, compressis geminisque ; lateralibus longis 

 subrectisque ; margarita salmonis colore tincta et viridescente. 



Hob. Siria Eiver, India (Major Le Conte); Ahmednugger 

 (SJmrtleff). 



There are also specimens in the Indian Museum which cannot 

 be separated from this species from Myadong and Shuaygoomyo, 

 Burma. It is of doubtful specific 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 N. ccerulea. 



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} occata (Lea) ; Simpson, Washington, B.C., 

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



Unio occatus, Lea, Proc. Acad. Nat. Sci. Philadelphia, iv, 1860, 

 p. 307 ; Journ. Acad. Nat. Sci. Philadelphia, vi, 1863, p. 398, 

 pi. 50, fig. 304 ; Ob8. on Genus Unio, x, 1863, p. 34, pi. 50, 

 fig. 304. 



