148 Records of the Indian Museum. [Vol. XXII, 



1879. Batissa similis, Clessin, Cycladeeii in Martini-Chemn. Conch.- 



Cab., p. 213, pi. xxxvi, fig. 3. 

 igo8. Batissa capillata, Preston, Rec. Iiid. Miis. II, p. 207, pi. xvi, 



%■ 39- 

 1915. Batissa similis and B. capillata, Preston, Fatin. Brit. Iiid. 

 Freshii'. Moll., p. 208. 



The specific identity of Preston's B. capillata with Prime's 

 species has been remarked on in the introductory part. The fol- 

 lowing notes on the specimens in the Indian Museum may be of 

 interest as supplementing Prime's description of the species. 



The shell in this species varies from subtrigonal or obovate to 

 ovate-orbicular ; it is very inequilateral, with a short anterior side 

 which regularly slopes down and is straight or only slightly con- 

 cave ; the posterior side is much longer and somewhat biangulate 

 in its distal part. The umbones are very anteriorly placed, being 

 recurved forwards and inwards but widely separated from one 

 another ; in most cases they are greatly eroded. Hinge. — There 

 are onh' two laterals in each valve. The anterior lateral may be 

 described as consisting of two parts, a distal curved part forming 



Text-kig. -'. — Photographs of the left \alves (x 3) of [a) B. similis. Prime; 

 [b) B. iitflata, Prime. 



the upper boundary of the impression for the anterior adductor 

 muscle and the proximal thicker nearly straight part in the hinge 

 region. The posterior lateral is blade-like, but slightly arched and 

 rather longer than the anterior. Both the teeth are finely serrate 

 along their upper inner margin. Of the three cardinals the anterior 

 is most small and conical in the right valve, somewhat larger and 

 knob-like in the left valve ; the middle one of the right valve has 

 the shape of the molar teeth of mamm.als but has only a single 

 furrow along its free edge, in the left valve it is much thinner but 

 larger ; the posterior one is thinner than the other two but more 

 elongate and somewhat curved and not so much compressed. The 

 areas between the three teeth are dee^ily canaliculate. 



Measurements (in millimetres). 



