140 



and the colour of the interior of the shell also distinguishes it 

 from that species. 



271. Nodularia (Nodularia) chaudhurii, Preston. 



Nodularia (Nodularia) chaudhurii, Preston, Rec. Ind. Mus., Cal- 

 cutta, vii, 1912, p. 290. 



Original description : Shell small, rather thin, elongately ovate, 

 pale olive, covered with a finely laminiferous periostracum ; both 

 valves concentrically striate, sculptured with irregular, minute, 

 nodulous, radiate ridges which appear posteriorly as regular corru- 

 gations ; umbones small, somewhat prominent ; dorsal margin 



Fig. 7. 1 & 2. Nodularia (N.) chaudhurii, Preston (type), nat. size. 

 3. Hinge and muscular scars of same. 



slightly arched ; ventral margin straight ; anterior side produced, 

 rounded : posterior side bluntly rostrate, abruptly sloping above 

 and below ; hinge teeth elongate, anteriorly projecting ; anterior 

 scars deep, roundly triangular ; posterior scars scarcely impressed ; 

 interior of shell iridescent, nacreous, posteriorly corrugate. 



Long. 12-75, lat. *J3 mm. 



Hob. Upper Burma. 



The type is in the Indian Museum. 



272. Nodularia (Nodularia) bonneaudi (Eydoux). 



Nodularia (Nodularia) bonneaudi (Eydoiix) ; Simpson, Washington, 

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



Unio bonneaudi, Eydoux, in Maff. de Zool. 1838, Cl. v, pp. 10-11, 

 pi. 119, figs. 1, I a ; H. & T., C. I. pi. 10, fig. 6. 



Maryaron ( Unio) bonneaudi, Lea, Syn. 1852, p. 32 ; 1870, p. 50. 



Shell oval, transverse, swollen, inequilateral, of thin texture, 

 gently sinuous in the median region ; the anterior side obtuse, 

 short ; posterior side obscurely angled ; umbones scarcely promi- 

 nent and not eroded ; the outer surface irregularly furrowed by 

 multitudinous stria?, covered with a thin yellowish green perio- 

 stracum ; interior of shell nacreous, white ; hinge narrow, the 

 anterior margin of the right valve bearing two lamelliform teeth 

 of equal size, the left valve bearing a single rather large crest-like 



