140 



TNIOIS'IDJE. 



aud the colour of the interior of the shell also distiuguishes it 

 from that species. 



271. Nodularia (Nodularia) chaudhurii, Preston, 



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

 cutta, vii, 1912, p. 290. 



Original description: — Shell small, rather thin, eloiigately ovate, 

 pale olive, covered with a finely laniiniferous periostracuiu ; both 

 valves concentrically striate, sculptured x^ith irregular, minute, 

 nodulous, radiate ridges which appear posteriorly as regular corru- 

 gations ; umbones small, somewhat prominent ; dorsal margin 



Fio 



-1 k 2. Nodularia (N.) chaudhurii, Preston (type), iiat. size. 

 3. Hinge a-jcl luusc-ular 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'T5, lat. 'J3 mm. 



Hah. Upper Jjurnia. 



The type is in the Indian Museum. 



272. Nodularia (Nodularia) bonneaudi {EijdouM). 



Nodularia {Nodularia) bonneaudi (Ey^QWx):, Simpson, Washington, 

 D.C., Smiths. List., Nat. Mus. Proc. xxii, I'JOO, p. 813. 



Unio bonnmudi, Evdoux, in Mao-, de Zool. 1838, CI. v, pp. 10-11, 

 pi. 119, figs. 1, l'« ; H. & T., C. I. pi. 10, tig. (J. 



Mar(jaron ( 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 striae, 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 



