OF SOUTHERN INDIA. 125 



TELLINA, Linne, 1758. 



(Including sub-genera^ vide p. 116^ &c.). 



1. Tellina [Tellinella] petrosa, Stoliczlm, PL XVI, Figs. 27-28. 



Tell, testa elongata, multo longiore quam alta^ parte antica paululum longiore 

 qiiam postica^ utrinque dtstincte attenuata, marginibtis superiorihis declivis, sub- 

 rectis, antice anguste-rotundata^ Jpo5^^^^ suh-angulata^ plicatura paulo elevata ; 

 margine inferiori lentissime curvato ; superficie striis crassiusculis lamelliformibus 

 confer lis notata. 



This is a Tather elongated form, of the type of the recent Tell, rostrata, nearly 

 or fully double as long as high ; with the upper edges descending gradually and 

 meeting at the beaks under an angle of about 132 degrees; the anterior edge 

 is somewhat convex, the posterior nearly straight ; the anterior end is rounded, the 

 posterior obtusely angular ; the inferior margin is very slightly curved. The shell 

 is thin, though not particularly so ; the surface is covered with concentric lamellar 

 striae ; the posterior plicature is slightly elevated, though distinct. I have not been 

 able to observe the hinge of this species, but there can be little doubt that it 

 belongs to the sub-genus Tellinella, On the specimen represented in fig. 28, 

 which is a cast, the lateral teeth are observable as impressions. 



Locality, — Garudamungalum, in a bluish calcareous sandstone. 



Formation, — Trichinopoly group. 



y/'2. Tellina [Tellinella] Arcotensis, StoUczka, PL V, Pig. 2. 



Tell, testa transversaliter elongata, valde compressa, fere cequilaterali, antice 

 latiore^ rotundata^ postice angustata^ sub-rostrata ; prope marginem distincte sulcata ; 

 umbonibus prominulis, late7Hbus superio7'ibus paululum declivis, fere rectis, margine 

 p)ostico antice convexo, postice insinuato ; superficie striis confertis, siibtilissimis 

 concentricis eleganter notata, Cardo in valva sinistra duobus dentibus cardinalibus 

 atque duobus lateralibus elongatis, sed paulo prominulis, instructus. 



Shell thin, very much compressed, transversally elongated, nearly equilateral, 

 anteriorly rounded and broad, posteriorly gradually attenuated, angular, a distinct 

 groove, bounded on either side by a moderately elevated ridge, running to the pos- 

 terior end ; beaks prominent, pointed, the upper sides nearly straight, descending, 

 meeting at the beaks under an angle of 135 degrees ; lower margin anteriorly 

 convex, posteriorly flexuous, insinuated; surface minutely and very regularly 

 concentrically striated. The hinge has in the left valve as usual .two cardinal and 

 two slightly prominent lateral teeth. 



This is a true species of Tellinella ; it greatly resembles several recent species. 



Locality, — Ninnyoor, in a white earthy limestone. 



Formation, — Arrialoor group, 



2 H 



