OF SOUTHERN INDIA. 257 
the spire. The surface is spirally and transversally striated. On the flat sutural 
portion there are sometimes present only two or three elevated spiral lines, but the 
transverse strize are generally stronger here, than on the rest of the shell. Below 
the angle there is, about the middle, one line prominently stronger than the others. 
Along the anterior margin there is always a keel present, being on the periphery of 
the last whorl specially distinct, but always obtuse or rather turned upwards, so as 
uniformly to curve on the base. The latter is convex, and the spiral striz near 
the periphery are somewhat stronger than those, which are placed nearer to the 
centre. Very seldom, and only in very young specimens, are all the spiral strize of 
the shell nearly equal, but in this case they are very fine, (see Fig. 4, Pl. XX). 
The umbilicus is crenulated on the edge, and its width measures about one-third 
of the basal diameter. The aperture is almost quadrangular, with very thin 
margins. 
Our species is closely related to Sol. moniliferum,* Michelin (not Sol. moni- 
liferum, Brown)+, but it wants the posterior tuberculated edge and the strong 
anterior keel on the whorls, which are so characteristic for Michelin’s species. — 
Localities —Karapaudy, 8. of Arrialoor, Comarapolliam, and near Veraghoor ; 
in coarse, siliceous sandstone ; common. 
Formation.—Arrialoor group; the last named locality is on the boundary 
between this and the Trichinopoly group. 
4, SOLARIUM VYLAPAUDIENSE, Stoliczka, Pl. XX, Figs. 5-6. 
Sol. testa orbiculata, seu depresso conica ; anfractibus in junioribus speciminibus 
ad margines posteriores paulo contractis atque spiraliter minutissime striatis, in 
adultis fere planis levigatisque, ultimo ad peripheriam acute angulato, ad basim 
convexiusculo, spiraliter atque transversaliter striato: striis transversalibus ad mar- 
ginem wnbilici multo fortioribus; wmbilico angustato, margine crenato; apertura 
obliqua, subquadrata. 
Spiral angle 105°- 120°. 
The form of the shell varies from a broadly conical to an almost discoidal 
shape. In young specimens the whorls are somewhat constricted posteriorly, and 
very finely spirally striated; in older specimens they are almost perfectly flat, 
separated by impressed sutures and smooth. The last volution is angular at the 
periphery and convex at the basis, which is provided with a fine spiral and 
transverse striation; these strize being much stronger round the umbilical 
edge, on which they produce a slight crenulation. The spiral striation becomes 
very often obsolete, at least tuwards the peripherical margin. The umbilicus 
is of moderate size, its width being about one-fourth of the total diameter of the 
basis; aperture quadrangular and oblique. 
* D’Orbigny, Pal. Franc. terr. crét., IT, p. 197, pl. 179, figs. 8-12, 
+ S. submoniliferum, D’Orb., Prod. III, p. 45. 
