306 CRETACEOUS GASTROPODA 
2. GYRODES TENELLUS, Stoliczka, Pl. XXI, Fig. 14. 
Gyr. testa semiglobosa, spira brevi; anfractibus paucis, postice truncatis, atque 
applanatis, ultimo maximo, latissimo; basi ad medium late excavata, ad marginem 
angulata, vie crenulata; apertura per-obliqua, antice rotundata, valde producta, 
postice angusta et acuminata, labio tenut. 
Height of the shell : its width (considered as 1:00) odo ar pao). \lfeh}, 
This species is distinguished from the last by its more depressed form, by the 
want of crenulation both on the posterior flattening of the whorls and on the edge of 
the umbilicus, also by a considerably more oblique aperture, which is very narrow, 
posteriorly pointed, and anteriorly broadly rounded; the inner lip is thin, without a 
trace of a columellar callosity. 
Localities.—K. of Anapaudy, (Trich. gp.); Malvoy, W. of Arrialoor, Mulloor, 
(Arr. gp.); not very common; none of the specimens found attain the size of 
the preceding species. 
formations.—Trichinopoly — and Arrialoor — groups. 
XLVIII. MAMMILLA, Schumacher, 1817. 
1. Mammitia EpuRA, Sfoliczka, Pl. XXIII, Fig. 1. 
Mamm. testa semiglobosa, depressa, levigata, spira brevissima, apice acumi- 
nata; anfractibus 3—4, suturis viv conspicuis junctis, ultimo per-lato, postice 
subconvexo, antice ad basin anguste rotundato, late umbilicato ; labio calloso, crasso, 
brevi. 
Spiral angle nearly 130°. 
Height of shell : its width (considered as 1:00) ... po oe po OE 
A much depressed semiglobose shell with a very short pointed spire; the last 
whorl embracing to a great extent all the previous ones, being much broader than 
high. The sutures are scarcely traceable, and there is no perceptible flattening 
of the posterior margin of the whorls to be observed. The species is principally 
to be distinguished by the very great callosity of the inner lip, though the shell 
itself has no considerable thickness; the umbilicus is very large at the base and 
funnel shaped, becoming rapidly narrower towards the interior centre of the 
shell; there is no trace of any contorted thickening of the columella in the 
umbilicus, in spite of the great thickness of the inner lip. The outer lip is sharp 
and posteriorly separated from the former by a narrow channel; the surface of 
the shell is perfectly smooth, and the aperture very oblique and anteriorly 
produced. 
Locality —Ninnyoor ; only a few specimens have been found in whitish, arena- 
ceous limestone, associated with Oypree, Nerinee, and Hippurites. 
Formation.—Arvialoor group, 
