OF SOUTHERN INDIA. 387 
imperfectly preserved specimens there are on the upper whorls transverse ridges 
(see Fig. 2a.) traceable, which appear to owe their origin to lamellar thickenings, 
slightly projecting in the internal space of the whorls; they disappear as soon as 
the shell attains a larger size. The entire surface of the shell is spirally striated, 
the striz usually alternating in strength, though none of them are of any consi- 
derable thickness. The striz of growth are much thinner and produce a fine 
granulation on the former, being clearly perceptible when the surface of the shell is 
well preserved. 
The basis of the last whorl is more or less sharply carinate at the periphery, 
slightly convex, depressed in the centre, distinctly umbilicated and spirally striated, 
the striz being in old specimens more distinct near the umbilicus and at the 
periphery, than between them. The aperture is quadrangular, rather oblique in 
well preserved shells, having on the outer lip a deep, very narrow slit. 
This species is very closely allied to a large number of cretaceous Leptomarie, 
like Lept. (Pleur.) gigantea, striato-granulata, Goldf., Lept. Anstedi apud Pictet and 
Campiche,* and several others which are extremely variable in form. We are in 
possession of a large series of the present Indian species from different localities 
and beds of the Trichinopoly district, but it is impossible to detect in the degree of 
the angular shape of the whorls, or in the spiral striation, any characters which 
would indicate a farther specific distinction. In most cases the differences in the 
ornamentation and also in the convexity of the whorls appears to us rather to 
depend upon the preservation of the shell, than upon anything else. It is always 
a great mistake to determine species only from their casts, but in the case of this 
peculiar type of Pzrevrorouariup.», to which the present species belongs, such deter- 
mination actually appears to have no value whatever. From all our cast-specimens 
(about 100) I can hardly find two which are in every detail identical. 
There are often specimens met with which on the upper whorls seem to have 
had portions of the thin shell near the band fractured, and though these places 
become subsequently restored, they always are traceable from the interruption of 
the spiral and transverse strize (see Fig. 2 a). 
Localities —Neighbourhood of Odium and Moraviatoor, in brown calcareous 
sandstone (Ootat. gp.) ; Olapaudy, Veraghoor, Comarapolliam, Arrialoor, Mulloor, 
ete., in light coloured sandstone (Arr. gp.) 
Formation.—Ootatoor and Arrialoor groups, more common in the last one. 
LVI. Family,—_HALIOTIDZA. 
According to the observations of Cuvier, Deshayes and others, the animal of 
Haliotis is distinguished by a large foot provided with two lateral fringes, composed 
of equally formed filaments, resembling those of the S7omwarrp#; the muzzle 
of the head is produced and thick, the tentacles rather long, and usually not 
* Mat. Pal. Suisse, IIIme. Ser., pl. 80, fig. 3; this does not-appear to be identical with Forbes’ Pl. Anstedi 
in Quart: Journ. Geol. Soc., London, 1845, I, p. 349, pl. 13, fig. 1. 
