PLATE XXX. 



CJcii as — Callista, Murch . 



Figs. 



1 — G. G. jihdi" (8o\v.). ITpper Greensaud, Blackduwn. Sudgwick Must'uiii, 

 ('ainl)i-i(lov. (!'. 1112.) 



1 (I. vhj;\il valvf ; /;, oriiainciitaliou on the jiustcro- ventral i);irt x (5. 



2. Hin^'u of right valve. The part anterior lo the niiiMle of the anterior pit is 



cliuwu from auothor specimen. 

 'S — G. Left valves. 3 6, interior of 3 a; 3 c, dorsal view of 3 a ; 4fc, auterior view 



of 4rt. 



(Iclins PliOTOCAIiDI A, ISrijrlcIl . 



7. I', (iii'jiicd., Wood.s. howei' Greensaud (Ci-ackers), Atlioi'tk'ld. Sedgwick 

 Muscuiii. (/, left valve X f ; h, dorsal view X 1. (!'. 1 '.»!•.) 



