PAEliETSIA. 



173 



posteriorly ; anterior side gently rounded ; posterior side slightly 

 and very bluntly produced, rounded ; cardinal teeth very anteriorly 

 situate, with upper surface multi-ridged and supported in each 

 valve by an enormous column-like callous thickening of the shell ; 

 lateral teeth coarse, rather short, curved ; anterior muscular scars 

 of great depth ; posterior scars subcircular, well impressed ; 

 interior of shell very pale greenish white. 



Long. 37, lat. 55, diara. 33 mm. 



Hob. ISTongyaug Lake, south of Patkai. 



The type is in the Indian Museum. 



308. Parreysia (Parreysia) annandalei, Preston, 



Parreysia (Parreysici) annandalei, Preston, Rec. Ind. Mus., Calcutta, 

 vii, 1912, p. 302. 



Original description : Shell oval, convex, moderately solid, 

 coarsely concentrically ribbed, covered with a thin, smooth, 

 brownish-olivaceous periostracum ; umbones rather small, not 



jrjg > 18. 1 & 2. Parreysia (P.) annandalei, Preston. (Type.) Nat. size. 



3. Hinge of same. 



prominent; dorsal margin arched; ventral margin considerably 

 rounded; anterior side slightly produced and rather sharply 

 rounded : posterior side very bluntly subrostrate ; cardinal teeth 

 two in each valve, somewhat anteriorly situate, rather coarse and 

 corrugated ; lateral teeth strong, curved ; anterior scars rather 



