314 CRETACEOUS GASTROPODA 
descriptions of three new species, Naticina ornata, Amplostoma awriforme, and. 
Velutina orientalis, all from the highest beds of the South Indian cretaceous rocks, 
the Arrialoor group. 
LXXI. NATICINA, Gray, 1842. 
1. Narictna orNATA, Stoliczka, Pl. XXIII, Fig. 6. 
Nat. testa ovato-globosa, spira paulo elevata; anfractibus tribus, convexis, 
postice sub-applanatis ; superficie costulis spiralibus, alternatim fortioribus et tenui- 
oribus, atque striis increment minutis ornata. 
A small sub-globose shell consisting of three convex, rapidly increasing volu- 
tions which are posteriorly somewhat flattened, over the entire surface ornamented 
with coarse and thin spiral ribs, and very numerous fine strive of growth. In 
our specimen the surface is only on the last whorl partially preserved; having 
posteriorly near the suture six thinner spiral ribbings and on the lower and more 
convex portion seven stronger ones, which alternate with one to three finer strie, 
also unequal in strength, the striae of growth producing a fine crenulation 
on the former. This ornamentation is a little different from that usually found in 
Naticina, and more resembles that of the species described by Gabb as Lysis. The 
form of the aperture of our Indian species agrees, however, better with that of other 
Naticine, the aperture being wide, not much elongated, and having apparently the 
inner lip not remarkably thickened. 
Locality.—S. E. of Arrialoor, in light coloured sandstone ; very rare. 
Formation.—Arrialoor group. 
LXXII. VELUTINA, Fleming, 1820. 
1. VELUTINA ORIENTALIS, Stoliczka, Pl. XXITI, Fig. 4. 
Velut. testa sub-globosa, levigata, tenw, spira parum elevata; anfractibus 
tribus, conveaxis, suturis impressis junctis, postice paulo applanatis, ultimo valde 
inflato, convexo, latiore quam alto; apertura subrotundata, labio tenui, moderate 
curvato, labro arcuate expanso. 
This species has very much the form of the recent Velut, capuloidea, having 
the spire slightly elevated, the whorls separated by deep sutures and the aperture 
enlarged and roundish. The inner lip is thin, and there is no distinct umbilical 
opening. The surface of the shell exhibits very fine strize of growth, but is otherwise 
smooth. 
Locality.—Near Comarapolliam, in whitish sandstone; very rare. 
Formation.—Arrvialoor group. 
