264 CRETACEOUS GASTROPODA 
certain of the determinations of any true cretaceous Littorine. He quotes with doubt 
Litt. gracilis, Sow., and Litt. Roissy, D’Arch. The former is very probably a Sand- 
bergeria, one of the sub-generic groups of Cerithiwm. Specimens from Blackdown, 
which I have examined in the London Geol. Soe’. Collection, are very similar to our 
Cerith. antecedens, (vide p. 202), which I found to be the same as Forbes’ C. Tri- 
chinopolitense. The Blackdown specimens have the aperture anteriorly provided 
with a very short and shallow canal. Litt. carinata, Sow., sp. (Turbo idem) appears 
to be an Amberleya. There is, however, no reason why species like Litt. elegans, 
L. decussata, Desh., LZ. extensa, Sow.,sp., L. sculpta, Reuss and several others, 
should not belong to this genus. 
We have to notice from the South Indian cretaceous deposits the unusually 
large number of six new species, some of which are closely related to forms still 
existing in the neighbouring seas. The most peculiar is the Litt. crassitesta, 
belonging to a somewhat different type, having the outer lip posteriorly insinuated. 
It is, however, impossible in the present case to regard this character as of any 
important generic value, for the transitions to a broad and shallow insinuation, 
like that of Litt. attenuata and ZL. inconstans, are so gradual, that no possible 
limit can be fixed for it. In fact somewhat similar cases,—sometimes even developed 
nearly to the same extent,— can be observed in different varieties of the common 
Litt. littorea. Considering the small number of specimens, by which our Indian 
Littorine are as yet represented, we may expect large additions through farther 
examination of the respective grounds; for there are scarcely any other Gastropoda 
to be found in larger numbers, than the Littorine where they once have made 
their habitat. 
LVII. LITTORINA, Férussac, 1821. 
1. Larrormna unpata, Stoliczka, Pl. XX, Fig. 11. 
Litt. testa elongata, apice acuminata; anfractibus planiusculis, suturis vix im- 
pressis junctis, levigatis, striis incrementi tenuissimis notatis ; ultimo anfractu ad peri- 
pherian convexo ; basi producta ; apertura ovato elongata, postice acummata, antice 
sub-effusa ; labio crassiuscula, levi. 
Spiral angle 44° ; sutural angle 9°. 
Height of the aperture : total of shell ... (considered as 1-00) ... ee 0:45: 
Width of penultimate whorl : its height... ( 90 ATO ecco con | EXO) 
Shell elongated, composed of flattened and smooth volutions with a narrowly 
ovate aperture, being slightly effuse in front. The strie of growth are very fine, 
and a short distance below the suture slightly insinuated, corresponding with a 
shallow constriction of the whorls. The inner lip is thickened and smooth, as in 
other typical Littorine. The species belongs to the same group of smooth forms, as 
the recent Litt. araucana, D’Orb., Litt. zebra, Wood, and others, which are usually 
in a living state ornamented with different zigzag and variegated lines. 
Locality.—Comarapolliam, in whitish sandstone; only a single specimen has 
as yet been found. 
Formation.—Arrialoor group. 
