OF SOUTHERN INDIA. 231 
The Scazz are only doubtfully represented in the jurassic period, but many 
very characteristic forms are to be found already in the lowest cretaceous beds, and 
from that period they gradually increase up to the present time. 
Pictet and Campiche (Mat. p. 1. Pal. Suisse, 3me. Ser., p. 336, ete.) enumerate 
thirty European cretaceous species, some of which are, however, very doubtful, 
though most of them belong probably to this family and especially to Scala. To this 
number have to be added Se. compacta, (Dixon, Geol. of Sussex, p. 349, Dinars 
fig. 32) with numerous thin, transverse ribs, like Acrilla, and Se. albe-crete 
Tate, (Quart. Journ. Geol. Soc., London, 1865, X XI, p. 38, pl. 3, fig. 6) from 
the cretaceous deposits of Ireland. Se. canaliculata, Vilanova, was identified by 
Coquand with Cerith. Forbesianwm, D’Orb. (Mon. Etage Aptien, 1866, p. 85). 
Of African species there is only one known. From North America six are quoted by Meek, 
(Check list cret. and jur. foss., 1864, p. 20) namely, Se. annulata, Morton ; Se. bicarinifera, Shumard ; 
Se. cerithiformis, Meek and Hayden; Se. Forshayii, Shum. ; Se. damarensis, Shum.; Se. Sillimani, 
Morton; to which has to be added Se. Mathewsonii, Gabb (Pal. Calif. 1864, I, p. 212, pl. 82, 
fig. 278). I have compared in the museum at Bonn the original of the Se. Texana, Romer,—placed 
by Meek in his Check list, ete., p. 20, under Chemnitzia,—and found, that it is based upon an imper- 
fect specimen of an Aporhais, The Se. Chilensis was first described by D’ Orbigny as a tertiary 
species, but the author does not say upon what ground he transferred it (Prodrome II, p. 216) into 
the Senonien. A similar doubt exists with regard to Sc. Auca, D’Orb. and Se. Pattonii, Gabb 
(Proc. Am. Phil. Soc., Philad., VIII, p. 185), whether they are cretaceous or tertiary species ! 
The South Indian cretaceous deposits have yielded four species; one already 
described by Prof. Forbes and named subsequently by D’Orbigny Se. subturbinata ; 
two species, Sc. Clementina, Mich., and Sc. striatocostata, Miiller, are to all appear: 
ance identical with European forms; and one is new, which has been named 
Se. Shutanurensis. 
Thus the number of cretaceous species of Scazip#, as at present known, 
will be about forty-five. 
XLIX.—SCALA, Klein, 1753. 
1. Scata Crementina, Wichelin, sp. (var.?), Pl. XVIII, Fig. 1 
1842. Scalaria Clementina, D’Orbigny, (Melania id. Michelin), Pal. Frang., crét. II, p. 52, Pl. CLIV, Figs. 6-9. 
It is possible, that we have this characteristic gault species represented in India, 
but the single figured fragment is so very incomplete, that we cannot vouch for its 
identity. The only difference between ours and D’Orbigny’s figure is the smaller 
spiral angle of the latter shell, but the form of the whorls with their posterior 
contraction, the number of transverse ribs varying from twelve to fourteen and 
disappearing on the posterior suture, do not show any difference from those in the 
European form. It is sufficient for the present to draw attention to this species, 
and defer its exact determination until the discovery of better materials. 
Locality—The figured fragment was found in the calcareous sandstones North 
of Odium in the Trichinopoly District. 
Formation.—Ootatoor group. 
