OF SOUTHERN INDIA. 243 
LII. VERMICULUS, Lister, 1688. (Vide p. 239). 
1..VERMICULUS ANGUIS, Forbes, sp., Pl. XXVIII, Fig. 1. 
1847. Vermetus 2? anguis, Forbes, Trans. Geol. Soc., Lond., VII, p. 124, Pl, XIII, Fig. 1. 
Testa anfractibus crassis, sub-rotundatis, sinistrorsis, disjunctis, in superficie 
exteriore liris spiralibus atque transversalibus decussantibus, subtuberculatis ornatis. 
The only known fragment of this species is that originally described by Prof. 
Forbes. The shell is sinistrorse, very thick, and the whorls have the outer surface 
ornamented with a number of spiral and transverse ribs, forming at the places of 
junction more or less sharp and elevated tuberculations. The columellar surface of 
the whorls is only spirally striated. The strize of growth are numerous and very 
fine. The fragmentary specimen of the shell is very likely the lower and more 
uncoiled portion of a species of Vermiculus, because it does not show any place of 
attachment. 
Our representation on Pl. XXVIII is taken from Prof. Forbes’ original speci- 
men, now in the collection of the Geol. Soc. of London, as no other of this interest- 
ing species has been found since its first discovery by Messrs. Kay and Cunliffe. 
Locality—Pondicherry, in a bluish sandstone. 
Formation. —Valudayw—or Arrialoor—group; the last named is probably the 
correct one. 
LIII. THYLACODES, Guettard, 1774. (Vide p. 240). 
1.—THYLACODES LAMELLOSUS, Stoliczka, Pl. XVIII, Figs. 9-10. 
Thyl. testa irregulariter spirata, adherente, plus minusve acglomerata; anfractibus 
subtubulosis, paulo depressis, in superficie transversaliter numerose lamellatis, supra 
interdum spiraliter sub-carinatis ; sectione anfractuum ovalt. 
The tube of this species is spirally coiled in the first stages of age, attached to 
various submarine objects; in more advanced age it grows rather in a straight 
direction, and is apparently partially free. The section of the tube is always more 
or less oval, which is especially the case in the fixed portions of the whorls. 
The surface is covered with transversal lamellee, which are evidently the remnents 
of the enlarged margins of the aperture. On the outer surface there are occasion- 
ally present two or three, partially obsolete keels, the rest of the surface being 
smooth. In young specimens the transversal lamelle are more distant, but less 
prominent, than in older ones, and recall very much the form of Vermicularia 
umbonata, Mant. (Foss. Sth. Downs, 1822, p. 111, pl. 18, fig. 24,) from the Chalk- 
marl of Hamsey. 
Locality.—Comarapolliam, in a gritty sandstone ; rare. 
Formation.—Arrialoor group. 
