PLATE XXV, 



Fig. ... 1. PixxA AEATA, Fovh., p. 384 ; \l, is an enlarged portion of the shell surface from 

 the lower half of the left valve ; south-east of Koloture, Tnch'mopoli/ group. 



Figs. 2 — 3. PixN-A LATicosTATA, ^tol., p. 385 ; side-, and sectional, views of two fragments; 2 h, 

 represents an enlarged portion of the shell surface of the lower half of the right 

 valve ; both specimens are from CoiuarapoUiam, Arrialoor group. 



