OF SOUTHERN INDIA. 471 



Western Germany, in France, England, North America, fO. lar/m of Lam.), 

 Northern Africa, Poland (near Lemberg), Prussia, Asia Minor, Arabia, &c. Forbes 

 and d'Orbigny both proposed a new name for the Indian fossil, but its iden- 

 tification Avith the European one has been already pronounced by Coquand, 

 a conclusion to which I also arrived already some few years previous when I had 

 an opportunity of examining Forbes' and d'Orbigny's original specimens. 



7. OsTEEA [Alectryonia] Arcotensis, StoUczka, PL XLIII, Figs. 3 — 7. 



Ost. [Alectr.] testa parva, irregtdariter stih-ovata, incequivalvi, valva wferlore 

 moclice convexhiscida, ad umbonem plus mimisve ohtusatum sessili, val. sup. aid paido 

 elevata aid plauiuscula ; tdraqiie radlatim crasse costata, costis crassis, sub-acutis, 

 slmplicibus vet dichotomis, sub-cequalilius, sub-lcevigatis, striis nounuUls incremoiti 

 distantibus transcendentibus, ad marginem oblique terniinantibiis ; margine ventrali 

 minide plicato, intus midtidentato, reliqiio crassius dentato ; area Ugamentali modica, 

 sub-triangidari, in valva inf. medio excavata, in vale. sup. ^j^«;?«; Unpress. muse, 

 excentrica, p)ostica, hand procula margine vent, sita, transversaliter sub-semicirculari ; 

 impress, pall, dorsaliter nonnunquam p>licatula. 



A small, sub-ovate, slightly bent species, the lower valve of which is moderately 

 convex, the upper more or less flattened. Both valves are covered with numerous 

 radiating, sub-equal, somewhat obtuse, ribs, crossed at certain intervals by a few 

 lamellar striae of growth and terminating obliquely near the margin, which is 

 strongly toothed, except at the ventral side, where the denticulation is much finer 

 and more numerous than anywhere else. In ornamentation, and partially also in 

 form, this species very closely resembles Ost. Villei, Coquand, from Algiers, 

 (Monog. Ostr. cret., 1869, p. 27), and I would have identified both were it not 

 for the very different shape of the muscular scars, which in the Algerian species 

 are much more transversally elongated and placed more posteriorly. 



Localities. — South-east of Arrialoor (in grey sandstone), north of Poodoo- 

 polliam, in a white calcareous sandstone. 



Formation . — Arrialoor group . 



8. OsTREA ACUTiROSTRis, Nilsson, PI. XLV, Figs. 1—6. 



1827. Ostrea aciUirostris, Nilsson, Petr. Suec, pi. vi, fig. 6. 

 1869. „ „ Coquand, Monog. Ostr. eret., p. 75. 



Ost. testa aut elongata, aid irregnlariter late ovata, inceqnivalvi ; valva inferiore 

 sessili, contexiuscida, concentrice crasse undulatim lamellosa et striata, radiatimqne 

 snb-costulata, costidis pliciformibus, cBquidistantibus, scepe indistinctis et lateraliter 

 obsoletis; timbone prodncto, rostrato, nonmmquam paulmn incurvato; area Ugamentali 

 medio fossula profunda instructa ; valva superiore scepissime pauhim minore, irregu- 

 lariter planulata aut sub-convexinscida, concentrice lamellata et striata, hand radiatim 



