OF SOUTHERN INDIA. 31 



2. ROCELLARIA SP. IND., PL I, Fig. 8. 



A single tube, apparently belonging to a Bocellaria, 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. GASTROCH^NA, Spengler, 1780, (see p. 26). 

 1. Gastroch^na aspergilloides, Forbes, PI. I, Fig. 12. 



1846. Fistulana? aspergilloides, Forbes, Trans. Geol. Soc, Lond., vii, p. 139, pi. 17, fig. 2~ic/cm aiietorum. 



Gast tubo tereti, longo, sub-cylindrico, concentrice sulcata, antice abrupte termi- 

 nanti, clauso, convexiusciilo, 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 Forbes' description, of which I also give a figure. 



Locality. — Pondicherry, in greyish sandstone. 



Formation. — Arrialoor group. 



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

 1. Clavagella semisulcata, Forbes, PI. I, Figs. 9-10. 



18-16. Clavagella semisulcata, ForLes, Trans. Geol. Soc, Lond., vii, p. 139, pi. 17, fig. 1 — idem auetoruni. 



CI. valvis ovalibus, tumescentibus, umbonibus obtuskisculis, anticis instructis, 

 concentrice minute striatis ; tubulis brevibus, irregular ibus, in tola 2^<^'^'>-pheria 

 marginali valvce adnatce et pariter magna ex parte in ea valvce liberce sitis ; tubo 

 jiroducto, lente arciiato, sub-l(Svigato, lateraliter compresso ac obsolete bi- sen tri- 

 stilcato. 



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 j^laced 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. Forbes' 

 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. 



