OF SOUTHERN INDIA. 223 
In connection with the elongated form and considerable height of the whorls, 
in proportion to their width, the principal distinctive characters lie in the ornamen- 
tation. Each whorl has five spiral ridges, the uppermost or posterior of which begins 
at the suture and the others follow at nearly equal distances from each other. 
The anterior ridge is the thinnest and is nearly all through equal in strength. The 
four above the first are distinctly, although not strongly, granulated, and of these 
sometimes the lowest is thicker than the others, sometimes the uppermost; not 
unusually they have all very nearly the same strength. Besides these ridges the 
entire surface is covered with fine spiral striz, which again often vary a little in 
their thickness. The strize of growth are as usual thin, and strongly insinuated 
above the middle of the height of the whorls. The basis of the last is produced, 
convex, carinate on the periphery and spirally striated; the aperture is roundish 
oval, being somewhat higher than broad. 
Locatity—North of Odium; only a few specimens have as yet been found 
in a greyish calcareous sandstone, belonging to the lowest division of our Trich- 
inopoly cretaceous deposits. 
Formation.—Ootatoor group. 
There exists a considerable difference between different authors as to what 
ought to be called Z. nodosa, quinquecincta, multistriata, Noeggerathiana, a. o. 
Without pretending to be in a position to clear up all these questions, we must give 
full reasons for our own identifications, and shew the extent to which they may be 
accepted. 
a. A reference to our figures and those of Goldfuss’ of 7. quinquecincta will be 
probably found a sufficient proof as to the identity of both fossils. Comparing with 
this the original drawings of Rémer’s 7. nodosa we find, that although identical in 
form and character of ornamentation, it has the fourth ridge from above the strongest. 
This variation does occur in one of our specimens (vide Pl. XTX, Fig. 20). Romer 
speaks only of four spiral ridges, but the existence of the fifth, which is always 
thinner and placed along the anterior suture, is distinctly traceable ou the pen- 
ultimate whorl of his figure. These two forms can therefore without any great 
objection be united under the older denomination of TZ. nodosa, as has been 
done by Geinitz and others. D’Orbigny (Prod. II, 227) considers 7. funiculosa, 
Math. (Cat., Méth. etc. pl. 39, fig. 15) as identical with 7. nodosa. This is, 
however, scarcely admissible from Matheron’s figure, which represents a much more 
conical and less cylindrical species. Its ornamentation appears to be also much 
finer. Very probably also belongs to the true 7. nodosa the form described by Miiller 
(Aach. Kreide., 1851, p. 51) as 7. Noeggerathiana, so far as can be seen on the 
original specimens. 
b. T. Noeggerathiana, Goldf. (Petr. Germ. III, p. 106, pl. 197, fig. 1) is 
a species with somewhat more convex whorls, each of which is ornamented also 
with five ridges, of which the anterior one is usually thinner than the rest. The 
two posterior ones are farther separated from the others, and the anterior of these 
two—that is the second from above,—is the strongest and most prominent of all. 
