1921.] B. Prashad : Xo/cs on LamcUibvanchs. 119 



with the nearly straight ventral margin ; posterior margin much 

 longer than the anterior, very gradually sloping downwards and 

 meeting the ventral margin in a broadly rounded angle, lunule 

 very small or even absent, ligament very long and thick ; hinge 

 as in the genus but with short and neaily transverse anterior 

 laterals and very long, curved posterior laterals ; anterior adductor 

 scar greatly impressed, that of the posterior adductor only feebly 

 marked ; palleal line greatly curved upwards anteriorly and with 

 a very shallow sinus ; nacre whitish with a narrow and indistinct 

 violet band on the margin. 



Measurements (in millimetres). 



I 2 



Length .. .. jrS 31 



Height .. .. 44'6 41-8 



Thickness .. .. 337 3i"2 



Type-specimen — No. M 11896/2 in the registers of the Zoolog- 

 ical Survey of India (Indian iluseum). 



Locality. — Two dry shells of this species were collected by 

 Mr. N. P. Panickkar at Komarakam in the Vempanad backwater, 

 Travancore, with a large series of specimens of V . cyprinoides. 

 The shells of the genus Villorita are locally known in those parts as 

 kayal kaka or backwater shells, no distinction being made between 

 the various species. 



Remarks ^This new species is distinguished by the shells 

 being much higher than broad, the very prominent and recurved 

 umbones, irregular sculpture and the different type of hinge. 



