OF SOUTHERN INDIA. 197 
7. CpritHium Arcorensn, Stoliczka. Pl. XV, Figs. 2—5. 
Cerith. testa conica, elongata, spira subulata, in medio atque antice subcylindrica : 
anfractibus numerosis, planiusculis, liris spiralibus alternatim crassioribus atque 
costulis transversalibus obliquis granulosisque ornatis, ultimis varicibus plus minusve 
numerosis interruptis, granis in serie posteriori juxta suturam positis multo fortioribus 
quam ceteris et nonnunquam linea impressa spirali rursus divisis ; costulis lirisque 
infra seu antice semper tenuioribus atque interdum in anfractibus ultimis omnino 
obsoletis ; apertura ovali, in utraque extremitate angustata ; labro paulo expanso, extus 
varicoso, intus levigato ; labio postice wni-dentato ; canali brevi atque angusto. 
Spiral angle 25°—30°; sutural angle 12°—13° 
Height of last whorl : total of shell (consd. as 1:00) ee coc (ai! 
Height of penultimate whorl : height of the spire (consd. as 100) ... 0-17 
sees i » 2 its width (consd. as 1:00) sh vee =0°54—0°58 
This elongated conical shell consists always of a large number of flattened 
volutions, the first few of which form a subulate apex, and begin to erow with an 
angle of 25—30 degrees, becoming subsequently almost cylindrical in shape. Each 
of the whorls is ornamented with a number of oblique, transverse ribs, interrupted 
at some distances by thicker varices, and with four or five spiral strize, which usually 
alternate in their strength, and produce a granulation on the former. The posterior 
series of these granules is always the strongest, the following series become 
gradually smaller, and towards the last volution all the ornamentation gets often 
more or less obsolete. The last whorl shows occasionally a little irregularity in its 
coiling by descending somewhat lower. The aperture is oval, posteriorly acute, and 
considerably narrowed by a strong fold-like tooth on the inner lip, and terminating 
anteriorly with a short, slightly bent canal. The outer lip is somewhat expanded, 
and thickened exteriorly so as to form a varix. 
This species has rather more the general form of Vertagus, but there is no trace 
of a fold on the columella, which is only sharpened where it terminates on the ante- 
rior canal. It approachesin ornamentation and form very much to the Cerith. rude, 
Sow. (D’Archiac, Gr. Numm. de I’Inde, p. 299, Pl. XXVIII, Figs. 9—12) from the 
numimulitic deposits of Scinde. The latter species has, however, the transverse ribs 
nearly always equally strong in their total length, and the tubercles are more 
rounded than spirally elongated. 
Localities.—N. HK. of Anapaudy (white sandstones) ; near Veraghoor (yellowish 
sandstones); and near Coothoor, in a whitish siliceous sandstone ; very common. 
Formation.—Axrialoor group. 
3C 
we. 
