OF SOUTHEEN INDIA. 465 



The species greatly resembles the European O. Scaniensis, Coq., (Mon, Ostr. 

 cret., 1869, p. 44, pi. 17, figs. 14—16), but is comparatively shorter and has not 

 a trace of radiating ribs on the convex valve. Should, however, the presence of 

 those ribs not prove to be an essential character in Scaniensis, there would hardly 

 remain sufficient grounds for separating both. Another allied species is 0. rediviva, 

 Coq., (loc. cit., p. 154), which only differs from the Indian form by its much nar- 

 rower and more elongated shape. 



Ijocalities. —'East and west of Arrialoor, in whitish sandstone and in a brownish 

 conglomerate. 



Formation. — Arrialoor group. 



3. Gryph^a Aeiana, StoliczTca, PL XLIII, 'Ei^. 2 ; PL XLIV, Pigs. 1—3. 

 Gri/ph. testa elongata, sub-lmguiformi, curvata, crassissima, concentrice lamel- 



lose striata; valva maj. convexa, lateraliter ad umhonem sessili, umbone hreviter 

 incurvo, fovea ligamentali lata, modice excavata, ad apicem valde angustata et cur- 

 vata, impressione museulari late ovata, fere centrali ; valva superiore swpissime 

 paulo concava, apice ohtusa aut truncata, area ligamentali latissima, suh-plana ; mar- 

 gine interno Icevi, 



Shell very solid, elongated, somewhat curved and usually sessile at the beak 

 of the convex valve ; both valves are only marked with strong lamella of growth ; 

 the muscular impressions are nearly central, ovate ; the ligamental area excavated 

 in the convex, flattened in the other valve, and in both very large. Prom the 

 small G. Arrialoorensis the present species is easily distinguished by its more gib- 

 bous form and the more obtuse beaks. 



Locality » — ComarapoUiam, in conglomeratic sandstone. 



Formation, — Arrialoor group. 



4. Gryph^a yesiculaeis, Lamarch, PL XLII, Pigs. 2 — 4 ; PL XLIII, 



Pig. 1; PL XLV, Pigs. 7—12. 



1806. Ostrea vesicularis, Lam., Ann. Mus., viii, pi. 22, fig. 3, 



1869. „ „ Coquand, Mon. Ostr. cret., p, 35, cum synon. 



Gryph, testa irregulariter suh-rotundata aut elongato ovata, valva inferiore 

 crassa, gibbosa, sub-lcevigata, concentrice lamellose striata, interdumque radiatim 

 sparse sub-costata, libera aut sessili, lateraliter ad marginem (inferiorem) lobata, 

 lobo postice nonmmqnam sinii distincto separato ; umbone obtuse attenuato, modice 

 incurvo, haud torto, nonnunquan indistincto et breviter adnato ; area ligamentali 

 magna, late sub-trigona, medio excavata ; impressione muse, sub-centrali, paulo inferius 

 posita, excavata, late sub-rotundata ; valva superiore aut plana aut paulo concava 

 altera multo minor e et tenuiore, l(Bvi, lineis radiantibus nonnullis interdum not at a ; 

 margine pall, in utraque valva prope umbones rugulose plicatulo. 



This well known upper cretaceous species is found abundant in the Arrialoor 

 group of South India. Young specimens often show on the flat valve some 



5x 



