144 CRETACEOUS GASTROPODA 
XXXV. NASSA, Lamarck, 1799. 
1. Nassa VYLAPAUDENSIS, Stoliczka. Pl. XII, Fig. 4. 
N. testa conica, spira elongata ; anfractibus senis seu septenis, prope planis, suturis 
parun impressis sejunctis, transversim costulatis, in parte posteriori apud suturam 4-5 
striis spiralibus ornatis ; costulis obliquis, paulo arcuatis, iterstitiis latioribus 
separatis, circiter 20 in uno circutu ; ultimo anfractu ad basim subangulato; basi 
spiraliter dense striata ; apertura— 
Spiral angle 40° ; sutural angle 8°. 
Although the aperture is not quite perfectly preserved in any of our specimens, 
the general form of this shell is so characteristic, that it most probably belongs to 
this genus. It is most nearly allied to those species, which H. and A. Adams refer 
to the sub-genera Zeuxis and Zaphon. 
The shell is conical, composed of six or seven nearly flat volutions, each of 
them being crossed by about 20 transverse ribs. These are slightly curved, oblique, 
and below the suture traversed by four or five spiral striz, becoming gradually 
thinner as the distance from the sutural line increases. The base of the last volu- 
tion is densely covered with spiral strize also. The aperture has been restored in 
its probable shape from a second but otherwise more defective specimen. 'The co- 
lumellar lip appears to have been partially thin, as the spiral striation is traceable 
on the posterior portion quite clearly, but the columella itself was quite solid. 
This species bears a great resemblance to several tertiary forms of Nassa, but 
there is up to the present no cretaceous species known, which could be compared with 
our Indian fossil. 
Locality —Vylapaudy in Trichinopoly ; four specimens have been examined. 
Formation.—Arrialoor group. 
2. Nassa. ARRIALOORENSIS, Stoliczka. Pl. XII, Fig. 3. 
N. testa conico-elongata ; anfractibus senis, convexis, suturis profundis sejunctis ; 
singulis postice ad sutwram valde constrictis, spiraliter dense striatis, transversim 
costatis ; costis circiter denis in uno circuitu, obliqus, crassis, ad suturam abrupte 
tenuioribus atque subangulatis, antice m ultimo anfractu evanescentibus ; apertura 
ovali ; labio levi, crasso, calloso. 
Spiral angle about 40°; sutural angle 11°. 
Tt is with some doubt that I refer this species to Nassa, although it may 
belong to the section Uzita of Adams, as the edge of the columella along the canal 
is somewhat sharpened, not provided, however, with a fold. The great thickness of 
the inner lip, which is smooth internally, and the general form of the shell, makes it 
almost certain that the species has to be classed with the Bucorwrpz. The only almost 
exceptional case, which could be expected when perfectly well preserved specimens of 
