OF SOUTHERN INDIA. 31 
OL 
LXXIII. AMPLOSTOMA, Stoliczka, 1868. 
1. AMPLOSTOMA AURIFORME, Stoliczka, Pl. XXIII, Fig. 5. 
Ampl. testa subovata, sub-depressa, tenwi, spira brevissima, duobus anfractibus, 
suturis profundis junctis, composita, ultimo antice valde producto, obliquo, late 
unbilicato, margine umbilict sub-acuto ; apertura ovata, obliqua, angusta, antice 
atque postice subacuta, ad marginem interiorem dissoluta, labro expanso reflexo ; 
superficie striis incrementi subrugosis obsolete notata. 
This remarkable species very much resembles Swccinea in form, having the 
last whorl rapidly enlarged in size, oblique and anteriorly much produced. The 
shell is thin and the surface almost smooth, leaving only indistinct and somewhat 
rugous striz of growth traceable. The aperture is rather narrow, oval, anteriorly 
and posteriorly subangular ; the outer lip expanded and with the margin reflexed ; 
the inner lip thin, flattened, and posteriorly detached from the previous whorl ; 
umbilicus large, with a sharpened edge round the basal periphery of the last 
volution. 
IT have already stated that this species is classed in the Vazurinip# principally 
on account of its thin shell, for in other respects it very much recalls the form 
of a Coralliophila. 
Locality —Comarapolliam, in light coloured sandstone ; very rare. 
Formation.—Arrialoor group. 
XLI. Family — JTANTHINIDA. 
H. and A. Adams, Gen. II, p. 85; Gray, Guide, 1857, p. 51. 
This family is classed by the authors of the ‘Genera’ in the Heteropoda, but 
we believe that its proper place is in the neighbourhood of the Vazorinrpz. 
The shells are so very thin and fragile that it must be considered an exception to 
the general rule, if any species belonging to this family are met with in a fossil state, 
though shells of Janthina and Recluzia are at present not at all uncommonly 
thrown up on the sea-shore. 
I do not know any cretaceous species which belong to the family. I may, 
however, take the opportunity of drawing attention to a few interesting paleeozoic 
forms which may belong to it; as, for instance, Scalites, Conrad, Raphis- 
toma, Hall, and others. It is not correct to place Raphistoma in the Prevro- 
Tomariup#&, because Hall distinctly says that the strie of growth are continuous 
and simply curved (like in Janthina), but not interrupted so as to form a separate 
band, as is invariably the case in all the genera of the Przvroromarup 2. 
XLIT. Family,—CALYPTRIDZ. 
H. and A. Adams, Gen. I, p. 363 ; CaLYPTREADZ, Gray, Guide, 1857, p. 115 ; Chenu, Manuel, p. 323. 
Gray proposed a separate division under the name of PLACOMOBRANCHIA includ- 
ing this and the next family, and added to these the Vawzxorrtp# (= Nerzrropsinz) 
which appear to be, however, better placed next to the Narzcrvz2, Deshayes 
