OE SOUTHERN INDIA. 419 



Very closely allied to R. carmata, Miinster, which appears to be a somewhat 

 higher shell, with the intermediate ribs obsolete on the posterior part of the shell, 

 while in the Indian form the intermediate ribs are all distinct when the shell sur- 

 face is well preserved. Besides that, the granules on the ribs are much less deve- 

 loped in carinata than they are in interplicosa. 



Locality, — In a whitish sandy limestone at Ninnyoor ; rare. 



Formation, — Arrialoor group. 



A species, quite similar in form to B. interpUcosa, occurs in a brownish lime- 

 stone near Coonum, in a yellowish limestone near Odium, and in a pinkish sandy 

 limestone near Moraviatoor ; but all the specimens are mostly casts. One shows 

 portions of the shell surface preserved, on which intermediate lines are traceable 

 between the larger ribs; but this character is not sufficient to decide upon the 

 identity of the two forms. All three last quoted localities belong to the Ootatoor 

 group. 



8. Eadula sp. indet., PL XXXVI, Eig. 6. 



Two fragmentary right valves of a peculiar species of Eadula were found in 

 a light grey sandstone south-east of Arrialoor ; they are obliquely ovate, moderately 

 tumid, with unequal ears, and covered with numerous rather fine radiating ribs, 

 scaly when well preserved. The two specimens evidently indicate a more tumid 

 species than Bad, ohliquistriata^ but they are not sufficient for specific deter- 

 mination. 



Formation, — Arrialoor group. 



9. Radtjla scabricula, Stoliczha, PL XXX, Eig. 8, 



Bad. valva oblique rotundato-ovata^ tumiditla, parva, radiatim circa 24d-costata, 

 costis trispinulosis, series mediance spinulis vel tuberculis ceteris paulo majorihus^ 

 interspatiis angustis, rugulosis ; auriculis parvis ; umhone paulo exstante^ hreviter 

 acutato, 



A small, slightly oblique, roundly ovate, and rather tumid shell, with the beaks 

 obtusely pointed and slightly prominent beyond the cardinal margin ; the surface 

 is marked with about 24 radiating ribs, each of which is provided with three rows 

 of small spinulose tubercles, the median being a little larger than the lateral ones ; 

 the interspaces between the ribs are finely concentrically rugose, these concentric 

 rugose lines becoming more distinct on the anterior or posterior declivities of the 

 shell, where the radiating ribs decrease in size. 



The species is closely allied to B, granulata^ Nilss., differing from it by a more 

 rounded shape, by the ribs being covered with small spinulose tubercles of sub- 

 equal size instead of spinulose scales, and by the rugose lines in the furrows 

 separating the ribs. 



Locality, — OomarapoUiam, in soft, coarse sandstone. Only a single left valve 

 has been examined. 



Formation, — Arrialoor group. 



