PAEHEYSIA. 171 



rotundato-ovalis, omnino prater ad extremitatein anticain sub- 

 radiatim gran oso-plicif era. 



The dimensions of three specimens given at the foot of the 

 original description are as follows : 



1. 2. 3 (young shell). 



Long. 52 45 34 mm. 



Lat 35 32 26-5 mm. 



Diam 22 20 17 mm. 



Length of ligament 23 20 -5 16 mm. 



Hob. Irawady River at Bharno. 

 The type is in the Indian Museum. 



305. Parreysia (Parreysia) sikkimensis (Lea}. 



Parreysia (Parreysia) sikkimensis (Lea) ; Simpson, Washington, 

 B.C., Smiths. Inst., Nat. Mus. Proc. xxii, 1900, p. 845. 



Unio sikkimensis, Lea, Proc. Acad. Nat. Sci. Philadelphia, iii, 

 1859, p. 151 ; Journ. Acad. Nat. Sci. Philadelphia, iv, 1859, 



tigs. 6, 7 ; Pastel, Conch. Sam. iii, 1890, p. 167. 

 Maryaron (Unio) sikkimensis, Lea, Syn. 1870, p. 64. 



Original description : Testa laevi, obovata, inaequilaterali, sub- 

 inflata, postice obtuse biangulata ; valvulis crassiusculis ; natibus 

 prominulis ; epidermide luteo-fusca, eradiata ; dentibuscardinalibus 

 parvulis, brevibus crenulatis, in utroque valvulo duplicibus ; later- 

 alibus brevibus subcurvisque ; margarita alba et iridescente. 



Nab. Sikkim (H. Cuming Sf Prof. Hanley). Represented in the 

 Indian Museum by specimens from Sibsagar, Assam (S. E. Peal) ; 

 Siliguri ; Namtsik ; Dihang, and Cachar. 



No dimensions being given with the original description, those 

 of three specimens in the Indian Museum are appended : 



1. 2. 3. 



Long 28-5 28-25 19-5 mm. 



Lat 38-5 37-25 2725 mm. 



Diam 20 19-25 12-25 mm. 



The species though varying somewhat, usually in the posterior 

 region, is easily distinguishable from others of the group by its 

 considerable convexity in proportion to its size and by its short, 

 broad, and generally ovately rounded form. 



306. Parreysia (Parreysia) gowhattensis (Theobald). 



Parreysia (Parreysia) gowhattensis (Theobald) ; Simpson, Wash- 

 ington, D.C., Smiths. Inst., Nat. Mus. Proc. xxii, 1900, p. 845. 



Unio gowhattensis, Theobald, J. A. S. B. xlii, 1873, p. 208, pi. 17, 

 fig. 4; Psetel, Conch. Sam. iii, 1890, p. 154. 



Original description : Testa quadrato-ovata, antice rotundata, 



