OF SOUTHERN INDIA. 23 
Shell ovate, pointed at each end, consisting of five or six convex volutions, the 
last of which is the most ventricose occupying about three-fourths of the total 
height of the shell. The upper whorls are densely covered with fine spiral strize, 
which do not seem to increase in number with the breadth of the whorls, but they 
become gradually more distant and are nearly obsolete on the last whorl. This one 
exhibits transversally strong flexuous ribs, originating at the suture and disappear- 
ing gradually on the anterior portion, where they are often replaced by strie of 
growth only, and in which case the spiral striation assumes again a little more dis- 
tinctness. ‘The outer lip is much thickened, expanded into a roundish or angulated 
wing, inside smooth and somewhat reflected, having a sharp margin; exteriorly it 
shews a kind of lamellar structure ; anteriorly and posteriorly it is insinuated. The 
posterior insinuation is rather deep, but the exterior margin is simply rounded or 
angulated and always somewhat more thickened, not, however, prolonged into a hook, 
as in the two other species of Pugnellus. The inner lip is in both equally thick, 
eallose, covering the preceding whorl nearly totally (Fig. 10). The canal is thin, 
contorted, terminating with a sharp point and bent inwards. The callosity of both 
margins extends over it, but it becomes much thinner here, and covers chiefly the 
exterior surface. This pointed form of the canal, and the want of a hook-like lobe 
on the outer lip, combined with the slight but broad anterior emargination are the 
principal and characteristic distinctions of this species from the two others. Speci- 
mens devoid of the callose covering and of the wing are nearly smooth and resemble 
a Buccinum, as Prof. Forbes remarks, or still more a Phasianella. 
Even the imperfect and cast specimens of this species are easily distinguished 
from those of the other species by their gradual, not abrupt tapering or contraction 
towards the anterior termination of the canal. 
Localities. W.of Parchairy and W. of Kullygoody; E. of Anapaudy and near 
Arrialoor. At all these localities the species is not very common ; the first three are 
in the Trichinopoly, the fourth in the Arrialoor group, of the Trichinopoly district. 
Formation. 'Trichinopoly and Arrialoor groups. 
II. APORRHAIS, da Costa. 1778. 
TT. ALARIA, Morr. & Lye. 1854. 
IV. ROSTELLARIA, ZLamk. 1799. 
and allied genera. 
By far the greater number of conchologists agree in the application of the 
name Rostellaria to the fusiform, chiefly smooth, species with a long anterior and 
short posterior canal, and a moderately expanded, entire or slightly digitated wing, 
having near the canal one distinct sinuation. The &. rectirostris and fusus are known 
as the best examples. The cancellated species with a short canal have been partly 
separated by Agassiz as Rimelia, and there are numerous fossil tertiary and cretaceous 
forms, which belong to this group. The fossil species with a very large wing and a 
short pointed canal, as 2. macroptera and others, belong to Hippocrene, Montf. 
