OF SOUTHEEN INDIA. 463 



incurvo, nonmmquam irregularis sessile ; valva minore aut plana aut paiilo concava, 

 suh'lcBvigata, in parte postica et ad marginem undiqiie striis lamellatis concentricis 

 instrticta ; fovea ligament, longa, curvata, angustissima, profunda ; impressione mu^c. 

 ewcentrica, sub-antica, late rotundateque ovata. 



The specimens from South India perfectly agree with the European species, 

 so well known under the name Ex. columha. Irregularities in the lower valves, 

 depending upon the form of the object to which they are found attached, are found 

 in India and in Europe. A peculiar form is represented in fig. 4i, pi. xxxv, in 

 which the shell near the beak is irregularly striated, or rather ribbed, the ribs 

 extending posteriorly almost to the margin. Other forms found in the same locality 

 are quite smooth and barely show a trace of attachment. The species attained in 

 India the same large size as in Europe. 



It seems almost a pity to abandon the well known name Bx. columha, but if 

 strict priority has to be enforced, Lamarck's oldest name suborbiculata must he 

 adopted, and not Batisbonensis of Schlotheim, for Lamarck had no more right to 

 give up the former name, than other authors had a right to prefer Batisbonensis to 

 columba. 



Localities. — Poodoor, Monglepaudy, north-east of Piiravoy, in brownish cal- 

 careous sandstone. 



Formation. — Ootatoor group. 



This species is characteristic for the Upper Greensand, or the middle series of 

 cretaceous deposits (Carentonien of Coquand) ; it holds exactly the same liori- 

 zoD in India. It has been found all through Europe and Northern Asia. 



8. ExoaYRA CANALicuLATA, Soivcrby, PL XLVIII, Eigs. 6 — 8. 



1813. Chama canaliculata, Sow., Min. Conc"h., I, p. 68, pi. 26, fig. 1. 



1869. Ostrea canaliculata, apud Coquand, Mon, Ostr. cret., p. 128, cum syn. 



JEx. testa irregulariter sub-ovata ; valva majore convexa, prope mnbonem lateral- 

 iter sessili et plus minusve irregulariter expansiuscula, Icevigata, lamellis incrementi 

 nonnullis distantibus notata ; umbone angusto, depressiusculo, lateraliter intorto ; 

 valva minore aut planata, aut concava, ad umbonem plus minusve distincter tortum 

 paulo elevata, concentrice crasse lamellata, nonnunquam striis radiantibus, interruptis, 

 indistinctis, sparsim notata, margine ventrali et dorsali prope umbonem denticulato. 



This species is, as pointed out by Coquand, very closely allied to Ex. lateralis 

 of Nils son, the latter having apparently the larger valve longitudinally more nar- 

 rowly convex and the smaller valve less strongly lamellated. In these points the 

 few Indian specimens of the larger valve better agree with canaliculata, and so 

 does also the ornamentation of the smaller valve, possessing on the surface a few 

 radiating lines, which are also indicated in Sowerby's original figure. The Indian 



