OF SOUTHERN INDIA. 465 



The species greatly resembles the European O. Sccmieusis, 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 O. recliviva, 

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

 rower and more elongated shape. 



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

 conglomerate. 



Formation. — Arrialoor group. 



3. GrvTi'nj:A Ariana, StoUczka, PI. XLIII, Pig. 2 ; PI. XLIV, Pigs. 1—3. 

 Gryph. testa elongata, siib-linguiformi, curvata, crassissima, concentrice lamel- 



lose striata; valca maj. convexa, lateraliter ad iimhonem sessili, umbone hreviter 

 incurvo, focea Ugamentali lata, modice excavata, ad apicem valde angnstata et cur- 

 vata, impressione miisculari late ovata, fere centrali ; valva superiore scepissime 

 paulo concaca, apice obtusa aut trimcata, area Ugamentali latissima, sub-plana ; mar- 

 gine interna Icevi. 



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

 of the convex valve ; both yalves are only marked with strong lamellae 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. Arrialoo)'eiisis the present species is easily distinguished by its more gib- 

 bous form and the more obtuse beaks. 



Locality. — Comarapolliam, in conglomeratic sandstone. 



Formation. — Ai-rialoor group. 



4. Grtphj^a vesiculaeis, Lamarcli, PI. XLII, Pigs. 2 — 4 ; PI. XLIII, 



Pig. 1; PI. XLV, Pigs. 7—12. 



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



1869. „ „ Coquand, Mon. Osh'. cret., p. 35, cum synon. 



Gryph. testa irregulariter sub-rotundata aut elongato ovata, valva inferiore 

 erassa, gibbosa, sub-lcBvigata, concentrice lamellose striata, interdumque radiatim 

 sparse siib-costata, libera aut sessili, lateraliter ad marginem (inferioremj lobata, 

 lobo postice nonnunquam sinu distincto separate ; xmibone obtuse attennato, modice 

 incurvo, hand torto, nonnunquan indistincto et breviter adnato ; area Ugamentali 

 magna, late sub-trigona, medio excavata ; impressione muse. stib-centraU, paido inferius 

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

 altera multo minore et temiiore, Icevi, lineis radiantibus nonnulUs interdum notata ; 

 margvne 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 



