OF SOUTHERN INDIA. 377 
XCIII. MARGARITA, Leach, 1819. 
1. MARGarira orBICULATA, Stoliczha, Pl. XXIV, Fig. 16. 
Marg. testa orbiculata, tenui, late conica, apice sub-acuminato ; anfractibus 
postice anguste applanatis, subconvexis, sublevigatis, transversaliter minute striolatis, 
ultimo ad peripheriam angulato, ad basin convexiusculo, late umbilicato ; apertura 
quadrangulari. 
Spiral angle 100° ; sutural angle 8°. 
Height of shell : diameter of its basis (considered as 1:00) ono ORGS 
The whorls of this species are posteriorly narrowly flattened, slightly convex, 
and only marked with transverse strie of growth; the last is angular at the 
periphery, and broadly umbilicated at the basis, the edge of which is not crenulated, 
though the transverse striz are particularly distinct on this portion of the shell, 
being thin as usual in recent species belonging to this genus. The aperture is 
quadrangular, but its margin is not perfect in our specimens. 
Localities—Near Andoor, in whitish, and near Garudamungalum, in bluish 
sandstone ; very rare. 
Formation.—Trichinopoly group. 
XCIV. DELPHINULA, Zamarchk, 1803. 
1. DELPHINULA ANNULARIS, Sfoliceka, Pl. XXV, Fig. 3. 
Delph. testa orbiculato-conica, crassa, spira subturrite-elevata ; anfractibus 
postice applanatis, lente-convexis, spiraliter quadri-jugosis, transversaliter striolatis, 
ultimo convexo, extus 7-8 jugis spiralibus, distantibus ornatis ; basi late wmbilicata : 
apertura subrotundata, marginibus paulo expansis, attenuatis instructa. 
Spiral angle about 110°. 
Approximate height of the shell : diameter of its basis (considered as 1:00)... 0°83. 
The shell is composed of about four volutions, which are posteriorly broadly 
flattened, and on the sides slightly convex and ornamented with four spiral, sharp 
ridges, two of them being placed nearer to the upper angle and two nearer to the 
anterior suture. The last whorl is convex on the periphery, and on the basis 
ornamented with about seven or eight similar ridges, which are rather distantly 
placed from each other. The entire surface of the shell is besides covered with very 
numerous, thin, transverse striz. The spiral ridges are wanting on the posterior 
flat portion of the whorls. The umbilicus is largely opened, with a very sharp 
rib near its edge. The aperture is rounded and only attached to the previous 
volution by a very narrow inner lip; its margins were somewhat expanded, as 
may be observed on several complete casts in our collection. 
This shell is very distinct from any other cretaceous form known, and it is a 
true Delphinula, being allied to several recent species, as D. laciniata, Lam., 
D. tyria, Reeve, and others from the Eastern seas. 
Locality.—W. and N. of Odium, in brownish sandstones ; not very rare. 
Formation.—Ootatoor group. 
AZ 
