102 CEETACEOUS PELECYPODA 



described as Solecurtus by Eorbes, but tlie form of the muscular impressions 

 and the very sliort pallial sinus make it much more probable that it belono-s to 

 Fharella, One of our specimens shows the hinge line below the beaks preserved, 

 but there are no teeth perceptible on it, which must have been broken off before the 

 specimen was buried in the rock, as is of common occurrence in recent species 

 of Pharella. In shape our species recalls d'Orbigny's Sol. Guerangeri. 



Locality. — Pondicherry, in a brownish, grey, compact, highly calcareous 

 sandstone. 



Formation. — Valudayur group (?). 



TAGELUS, Gray, 1847, (seep. 98). 

 Tagelus Albertinus, d'Orhigny, PI. IV, Eig. 3. 



1847. Tellina Albertina, d'Orb., Pal. de la voy. Astrolabe, pi. 4, fig. 23. 



y 



Tag. valva sinistra elongata, fere cequilaterali, parte posteriori paulo longiori 

 quani anterio^H, superjicie concentrice striata, in medio impressa atque ad marginem 

 ventralem insinuata, antice rotundata ; umbone pjrominente, postice versus incurvo, 

 fulcro ligamenti longo aa crassulo, umbone dtiobus dentibus parcis distantibus 

 instructo. 



Height of the valve : its approximate length ... ... 0-37 



Only the single figured left valve has been found. Its elongated form de- 

 pressed in the middle, the distinct concentric striation, the great length of the 

 fulcrum and the presence of two (though very small) teeth on a thickened margin of 

 the hinge so entirely agree with the recent species of Tagelus, that I have no hesi- 

 tation in placing our fossil in that genus. The recent Tageliis mostly are brackish 

 water species ; but although we have in South India not yet proved the existence 

 of a large brackish fauna, the occurrence of Helicivje in marine beds at Comara- 

 poUiam suflS.ciently indicate that land was not far off, and if this were the case 

 the want of rivers would also be extremely improbable. Our species has a close ally in 

 d'Orbigny's Solec. (TagelusJ Mobinaldinus, which is only somewhat more elongated 

 in proportion to its height. 



D'Orbigny's figure of Tellina Albertina is in proportion a little higher, but 

 there can be no doubt that it represents the same species as ours. 



Locality. — ComarapoUiam, in a soft, whitish sandstone. 



Formation. — Arrialoor group. 



