OF SOUTHERN INDIA. 195 
appear smooth, the tubercles being more or less rounded and somewhat prolonged in 
a spiral direction. The basis of the last whorl is only a little produced, slightly 
convex, and on the periphery bordered by an obsoletely tuberculated keel. The 
aperture was angular and somewhat roundish ; the inner lip smooth, with an elonga- 
ted posterior tooth; the canal has not been observed. 
The very marked ornamentation easily distinguishes this species from others. 
In Fig. 14 on the same plate is represented a fragment of a large specimen from 
the white, soft sandstones near Ninnyoor (Trichinopoly district, Arrialoor group). 
The form of the whorls, the character of the transverse ribs and of the spiral 
striation agree quite with those of the above species, and are different from any other 
shell, which we know from the South Indian cretaceous deposits. It is difficult to say, 
without actual observation of intermediate forms, that the spiral tuberculated bands 
of Cerith. limbatwmn ought to disappear without leaving even a trace of their former 
existence in more fully grown specimens ; that, however, similar changes do often occur 
in other species of Cerithiwm is well known. Still we desire by figuring the said 
fragment merely to draw the attention of any future observer to this very interest- 
ing fossil. 
Locality.—In light coloured sandstones near Coothoor; very rare. 
Formation.—Arrialoor group. 
5. CERITHIUM CARNATICUM, Sfoliczka. Pl. XVI, Figs. 1 and 2. 
Cerith. testa ovate-elongata ; anfractibus paucis, postice valde contractis, infra 
contractionem transversaliter tuberculate 8-13-costatis, spiraliter minute striatis ; 
ultimo iuflato, fere dimidium totius altitudinis teste formante ; apertura ovata, 
utraque extremitate attenuata; ladio postice arcuato, antice prope recto atque crasso 
et solido ; canali—? 
Spiral angle about 40°; sutural angle 6°—10°. 
Height of last whorl : total of shell ... ... (considered as 1:00) ... 0:48 
Height of penultimate whorl : height of spire ( Me bo. ope ad enecos. Ossi 
5 5 es B) ans} yuatoba, 6 Se Eee O49) 
The peculiar shape of the whorls, being much contracted posteriorly and each 
of them ornamented below this contraction with from 8—13 short tubercle-like 
transverse ribs, is very characteristic for this rare species. The surface of the shell 
is besides covered with fine spiral strive, which, however, become easily obliterated | 
with age, in which case the strize of growth appear usually more strongly marked. 
The last whorl is remarkably high in proportion to the total height of the shell, 
and similar forms to these are only to be found in the genus Cerithiwm proper, for 
which reason we have placed this and the following species here, although the 
anterior canal of either is unknown. 
The aperture of the present species is oval, pointed on both ends; the outer lip 
could not have been much expanded, but is not known in a perfect state; the inner 
lip was callose, arcuated, above the middle and anteriorly nearly quite straight, solid 
‘. 
