12 CRETACEOUS GASTROPODA 
Locality. N..and close to Alundanapooram, where the single figured speci- 
men was found in sandstone. 
_ Formation. Trichinopoly group. 
I1.—Macrocycuis, Beck. 1837. 
Macro. testa planorboidea, depressa, late wmbilicata, tenwi: anfractibus celeriter 
crescentibus, ultimo prope aperturam sepius inflato atque deflexo; apertura sub- 
rotundata, peristomate tenui, marginibus labro approxunatis antice paulum expanso 
atque reflexo. 
As restricted to the depressed forms with a thin shell, the genus MWacrocyclis 
seems to admit of tolerably good characteristics, although specimens, which are not 
in every way perfect, may be easily confounded with Zonites and others. H. and A. 
Adams quote besides MJacrocyclis four subgenera, which in part include rather 
different forms with strong and consistent shells, thickened peristome and not 
umbilicated; it seems necessary, that these should be separated. The species of 
Macrocyclis are chiefly inhabitants of the Hast. 
We notice one species from the South Indian cretaceous deposits, IZ. carnatica. 
1. Macrocycuis Carnatica, Stoliczka. Pl. I, Fig. 8. 
M. testa planorbulari, tenui; spira immersa, late umbilicata; anfractibus 
quaternis, rotundatis, supra atque subtus omninis conspicuis, transversaliter minute 
striatis : striis supra fortioribus ; apertura rotundata. ‘ 
It is not without hesitation, that we venture to name specifically such an im- 
perfect specimen as that figured. There seems to be no very serious objection as 
to its generic determination, although it exhibits some affinities to Nanina, which . 
genus is, as Mr. W. Blanford informs me, by far more numerously represented 
throughout India, than has been usually supposed. The planorboid form, however, 
making all the whorls visible above and below is rather foreign to true Nanine. 
‘The specimen is accidentally so much injured by pressure, that it is not easy to 
determine the very exact shape in the roundness of the whorls, so as to fix the 
specific characters. The shell is quite depressed, coiled in nearly a regular plane 
with slightly immersed spire and with a perfectly open umbilicus, so as to make 
all the whorls visible below and above. The whorls are only four in number, 
increasing rapidly in width, and covered densely with transverse striz. These 
are oblique, somewhat stronger above than laterally and below, and slightly 
bent forward on the outer periphery. The whorls themselves are roundish, having 
their greatest width above the middle, and being apparently less convex above 
than below. The specimen has not got the aperture preserved, but it could have 
been only very slightly enlarged, as traces of the peristome were lost in cleaning 
out the specimen. 
Locality. Near Veraghoor, in soft reddish coloured sandstone. 
Formation. Arrialoor group. 
