PLATE XI. 



Pijjc;, ] — o_ FuAGUM piLEcrRiiENS, 8tol., p. 222; Kort/i of Odium, Ootatoor group. 



Flo's. 3 — 7. Cakdium [TiiACHYCARUiuJi] incomptom, Fori., p. 216; 4, a front-view, com- 

 posed of two different valves; in 5 the surface of the valve is greatly worn off; 

 6 and 7 are perfectly preserved specimens ; 3, 4, 5 are from Serdamungalum ; 

 6 and 7 from AnajjaiiJi/ ; Trichuinpol// qroiip. 



Figs. 8 — lU. Caedium [Acanthocaudium] pillatum, Sfol., p. 21S; 10 is a right valve, eii- 

 lartjed twice the natural size ; 8, 9 rt, 10 are from Anapiaudy ; 9 is from Vyla- 

 pauili/, with the granulations on the rihs greatly worn off ; Tncliinopoly group. 



Figs. 11 — lo. Cakdium [Thachycardiuji] exulaxs, Slol., p. 216; all figures, in natural size; 

 from near Arrialoor, Arrialoor group. 



Fig. ... 11. Caudium [ ? Pectuncclus] scrobiculatum, Stol.,]}. 11^ ; side- and front- views of 

 a left valve, thrice the natural size ; Gariidamungalum, TrlcUuopolij group. 



Fiirs. l.j — IG. Cakuu'.m [Teachycardium] produqtuji, iSo^o., p. 217; 16, side-view; 16(/, frout- 

 view of another specimen, the right valve partially restored from tig. 16 ; Kulo- 

 ture, Ooiaioor group. 



