OP SOIJTHEEN INDIA. 31 



2. EOCELLAHIA SP. IND., PL I, Pig. 8. 



A single tube, apparently belonging to a B^ocellaria^ has been found in the 

 ■uppermost beds of the Arrialoor group at Ninnyoor ; it is somewhat cylindrical, 

 being roundish at the anterior end, and becoming gradually narrower towards the 

 posterior termination, which is laterally somewhat compressed. The species to which 

 this tube belongs is no doubt different from the former, and it is to be hoped that 

 further researches will lead to the discovery of the valves. 



VI. GASTEOCH^NA, Spengler, 1780, (seep. 26). 

 1. Gasthochjena aspehgilloides, Forbes, PL I, Pig. 12. 



1846. Fistulana ? aspergilloides, Forbes, Trans. Geol. Soc„ Lond., vii, p. 139, pi. 17, %. 2— idem auctorum. 



Gast, tuho tereti, longo, suh-cylindrico, concentrice sulcato, mitice ahrupte termi" 

 nanti, clauso, convexiiisculo, acute marginato. 



The great length and the anterior abrupt termination surrounded by a 

 sharpened edge fairly distinguish this tube from that of any other cretaceous or 

 tertiary species. The valves could not be exposed. The only specimen as yet found 

 is the original of Porbes' description, of which I also give a figure. 



Locality. — Pondicherryj in greyish sandstone. 



formation. — Arrialoor group. 



VII. CLAVAGELLA, Lamarck, 1812, (see p. 27). 

 1. Clavagella semisulcata, Forbes, PL I, Pigs. 9-10. 



1846. Clavagella semisulcata, Forbes, Trans. Geol. Soc, Lond., vii, p. 139, pi. 17, fig. 1 — idem auctorum. 



CI. valvis ovalibus^ tumescentibiis, umbonibus obtusiusculis, anticis instructis, 

 concentrice mAniite striatis ; tiibulis brevibus, irregularibiis, in tota peripheria 

 marginali valvce adnatcB et pariter magna ex parte in ea valvce libercB sitis ; tuba 

 producto, lente arcuato^ sub-lcEvigato, lateraliter compresso ac obsolete bi- seu tri^ 

 sulcato. 



The oval form of the valves and the obtuse beaks of the shell when well 

 preserved (fig. 10), and the laterally compressed tube, appear to be good distinguish- 

 ing characters of this species. In the cast (fig. 9) the beaks are more prominent. 

 The left valve is, as usual, grown together to the tube, though well marked on its 

 surface (see figs. 9 and 10), the right valve is covered over by the shelly tube ; short 

 tubuli rather irregularly placed are seen nearly all round the periphery of the 

 valves ; along the margin of the imbedded (right) valve they are, however, much less 

 developed, and in places nearly obsolete. I have given a figure of Prof. Porbes' 

 original specimen after it had been freed from the rock in which it was enclosed. 



Locality, — Pondicherry, in a light bluish or greyish sandstone. 



Formation, — Valudayur group. 



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