OF SOUTHERN INDIA. 225 
carinata ; apertura rotundata, marginibus tenuibus ; labro antice paulo eatenso, postice 
prope medium insinuato. 
Spiral angle 15°- 20°; sutural angle 10°- 12°. 
Height of last whorl : total of shell (considered as 1:00) Si ww. =0'25. 
Height of penultimate whorl : height of spire (consd. as 1:00) von 8 Oeil: 
3 " 5 : its width (op of nea A005 
The principal distinguishing characters of this species are the slender elongated 
form and the numerous slightly convex volutions, which are ornamented with three 
stronger anterior and two thinner posterior ridges. The first are always present, 
while of the two others the upper one generally, and sometimes both, disappear 
on the higher whorls (vide Pl. XVII, Figs. 10,12, 16). In such cases there is 
always a broad smooth space left between the suture and the uppermost of the 
three stronger ridges. The attenuated form and less convex whorls always distin- 
guish such fragments from those of 7. ventricosa, Forb. 
In young specimens the whorls are generally even, the ridges often slightly 
granulated and occasionally of considerable thickness. In some specimens, which 
are certainly not otherwise different, the ridges are from the first to the adult stage 
always smooth, or only partially granulated or interrupted by the lines of growth. 
Very much depends in such cases on the state of preservation of the shell-surface. 
I have repeatedly had occasion to observe, that in living Twrritelle similar 
little changes in the ornamentation often take place in the same species at different 
localities, inhabited by them. 
The entire surface of the shell is covered with fine spiral striz. The basis 
is convex with an additional keel on the periphery. The aperture is roundish, the 
margins thin, and in full grown specimens almost dissolute and separated from 
the rest of the shell along the inner lips; the outer lip is anteriorly expanded and 
externally deeply insinuated about the middle. 
This species is common all through the upper (Senonien and Turonien) 
eretaceous deposits of Germany, and occurs also in those of the Alpine Gosau 
formation. 
Localities.—In India we find it represented chiefly in the upper sandy beds of 
Arrialoor, Karapaudy, Comarapolliam, Mulloor and Vylapaudy; very rarely it does 
occur in the calcareous sandstones of the middle series near Garudamungalum. 
Formation.—Arrialoor and Trichinopoly groups. 
The first notice given of the species seems to be that of Geinitz, when he was 
induced to identify some of the young granulated specimens with 7. granulata, 
Sow. In his later publication (Quader., p. 124) Geinitz refers again some of these 
specimens to Sowerby’s species, but I do not think correctly, with the exception of 
fig. 7 (loc. cit.), for the whorls of the other figures do not correspond in their pro- 
portion with those of 2. granulata. The description and figure of Z. propinqua, 
(loc. cit.) is so insufficient and partly contradictory to the ornamentation of 
T. multistriata, that the identification can be accepted only on Geinitz’s own authority. 
Reuss’ name is characteristic and published previously to those of Goldfuss. 
3K 
