172 



postice declive truncata, margine ventrali recto. Urabonibus 

 decorticatis. Epidermide flavescente, postice viridescente. Testa 

 concentrice striata et rugis plurimis minutis valde approximantibus 

 angulariter seu fulgurate granuloso-crispata, postice tantum radi- 

 atim granuloso-crispata. Dentibus cardinalibus bifidis in utraque 

 valvo. ISTacrea cserulescenti-albida, iridescente. In senioribus 

 granulationes valde inconspicua? fiunt. 



Long. 25*5, lat. 39, diam. 18 mm. 



Hdb. Near Gowhatti, Assam. 



The sculpture of this species much resembles that of Nodularia 

 crispisulcata, Benson. 



307. Parreysia (Parreysia) perconvexa, Preston. 



Parreysia (Parreysia) perconvexa, Preston, Rec. Ind.Mus., Calcutta, 

 vii, 1912, p. 302. 



Original description : Shell ovate, slightly curved, very convex, 

 solid but much eroded, where intact covered by a dark blackish- 



Fig. 17. 1 & 2. Parreysia (P.} perconvexa, Preston. (Type.) Nat. size. 

 3. Hinge of same. 



brown periostracum ; umbones moderately large ; dorsal margin 

 sloping in an anterior direction ; ventral margin slightly curved 



