PLATE XX. 



Figs. 1 & 3. Teigonoarca Buahminica, Forbes, p. 354 ; from near Karapaudy, Arriatoor group. 



Figs. 2, 8j 9, 10. Trigonoarca Trichinopolitensis, Forbes, p. 353 ; 2, 8, 9 are from north of 

 Alundanapooram ; 10 from Serdamungalum ; Trichinopoly grovp. 



Figs. ... 4 — 5. Teigonoarca Gamana, Forbes, ^.2,'b\; from near Foodoor, Oolatoor group, (see 

 pi. 1, fig. 7). 



Figs. ... 6 — 7. Macrodon [ Grammatodon ?] dispaeilEj d'Orb., p. 351; uorih of Alundana- 

 pooram, Trichinopoly group. 



