OP SOUTHEEN INDIA. 167 



sliape like JPsammocola or Psammobella, most of them having been formerly 

 described as Fsammobia or Solen, In the venerin^ we hardly find a single species 

 belonging to Venus as restricted, and scarcely any of the other subordinate forms, 

 except perhaps Mercenaria, and one species may indicate a Cryptogramma. The 

 Cytherea group are, on the contrary, largely represented. We find many species 

 of Cytherea proper which is of general geographical range, apparently a great 

 many species of Callista and a large number of Caryatis, especially in America ; 

 Dione, chiefly in America, where most of the recent species also occur at the present 

 time, but hardly a single form occurs which could with any probability be referred 

 to Tivella, Of the old Circe group, including Lioconcha and Crista, there is also 

 scarcely a single species to be met with. Neither is there any distinct indication 

 of the occurrence of species belonging to the sunettinm. 



The BosimiN^ are found in large numbers and great variety, both with a solid 

 and with a thin shell. To the latter belong the species of Thetironia (commonly 

 known as ThetisJ, being the old representatives of the recent dementia. One of 

 the oldest cretaceous forms of the group with thicker shells is Uriphyla, but 

 not yet sufficiently well known as to the number of species ; it is decidedly a 

 Bosinia- form, and not an Astarte or Lucina, under which name several species 

 seem to have been described from Jurassic and cretaceous rocks. Next comes 

 Cyprimeria, which also greatly recalls Dosinia, while of this last genus proper there 

 are as yet no species sufficiently ascertained. Of Gemma there may be one 

 or two species, but these also are not certain. 



These general results will, I trust, also indicate how far we are justified in 

 attaching importance to the various genera and sub-genera pointed out in the 

 preceding pages. 



BAEODA, Stoliczha, 1870, (vide p. 145). 



1. Bakoda [IcanotiaJ Pondichekmensis, Forbes, sp., PL IV, Pig. 5 ; 



PI. XVII, Pig. 4. 



1846. Tellina ? Pondicherriensis, Forbes, Trans., Geol. Soc, Lond., vii, p. 142, pi. xviii, fig. 5— idem auctorum. 



JBaroda testa elongata, compressa, antice ac postice rotundata, valde incequila- 

 teralCy margine inferiore et superiore fere parallelis, umbonibus parvulis, acutis, paulo 

 prominuUs ; superficie striis crassis concentricis ac lineis radiantibus suh-obsoletis 

 notata, Cardo valvule dextrce dentibus cardinalibus tribus, duobus anterioribus 

 brevibus, postico elongate, omninisque tenuibus, compressiusculis instructus. 



Height : length ... ... ... ... ,.. 0-47 



Thickness : height ... ... ... ... ... 0'57 



The shell of this species is rather thick, covered with broad and rather strong 

 striae or ribbings, and a number of veiy fine radiating, mostly obsolete lines. These 



