PLATE XLIII. 



Fig. ... 1. Gi!YPHa;A vESiccLAKis, Lam., p. 465; inner- and front-views of an old, but 



fragmentary valve ; Comarapolliam, Arrialoor group. 



Fig. ... 2. CriiYPHJ5.\ Aeiaka, 5^0^., p. 465 ; an old shell, upper- and front- views; the shell 



was attached \>j an oblique, flat surface at the side of the umbo ; Comara- 

 poU'iam, Arrialoor group. 



Figs. 3 — 7. O.STEEA [Alectryonia] Arcotensis, /S/o/., p. 471; specimens of various shapes; 



3, in, 2>b, side,- inner- and front-views of an upper valve which was probably 

 attached to a branch of a tree or a stem of a coral ; 4, 4a, lower valve attached 

 by a large umbonal portion ; 5, lower valve, with a very small place of attach- 

 ment ; 6, lower valve, inner-, side- and front-views ; place of attachment 

 imperfect ; the costulation extends up to near the beak ; 7, la, lb, upper 

 valve, side-, inner- and posterior-views; from near Arrialoor, Arrialoor group. 



