PLATE XLVIII. 



Figs. 1 — 2. OsTEEA [Alectuyonia] pectinata, Lam., p. 469; 1, \a, side- and posterior- 



views of a perfect specimen ; 2, 2 a, inner- and outer-views of the umbonal 

 part of a right valve ; Poodoopolliam, Arrialoor group. 



Fig- •■■ 3. OsTREA [Alectryonia] amorpha, /Soz<;., p. 468; a very imperfect specimen on 



a piece of sandstone ; from near Serdamungalum, Trichinopoly group. 



Fig- •■■ 4. Plicatula septemcostata, Forh., p. 447; copy of Forbes' original figure of a 



Pondicherry specimen ; .■' Yaludayur group. 



Fig. ... 5. Ostrea [Alectryonia] caeinata, iaw., p. 468; 5, inner-view of a fragmentary 



right valve, and 5 a, posterior-view of a portion of the same in order to show 

 the tubercles on the ribs; near Veraghoor, TricMnopobj grovp. 



Figs. 6 — 8. ExoGYRA CANALICULATA, Sow., p. 463 ; 6 and 7, lower valves ; from near 



lUpagoodij ; 8, upper valve, natural size, and enlarged; north-easf of Odium, 

 Ootatoor group. 



Figs. 9—12. Anojiia variata, Stol., p. 479; 9, a round valve with the shell-surface very 



much worn oif; 10-12, specimens of various shapes; CotnarapolUam, Arrialoor 

 group. 



