Cretaceous Gastropoda, and Pelecypoda from Zididand. 21 
probably being about twelve. The sculpture characters are well 
, depicted, the thick flexuous costae assuming a most regular arrange- 
ment in conjunction with the wide and prominently channelled 
interspaces. Some erosion has smoothed the summits of the axial 
plications, as it is only occasionally the reticulate ornamentation can 
be observed crossing them. The spiral striations are the most 
strongly developed, whereas the longitudinal are finer and more 
numerous. These lines of ornamentation, however, are very difficult 
to see without the aid of a good lens. 
At first sight the specimen roughly resembles such shells as Scala 
dupmiana from the European Albian (Orbigny: Pal. Fran9aise Terr. 
Cretaces, Gasteropods, 1842, pi. 154, figs. 10-13, p. 54), or J. S. 
Gardner's S. canalicidata [non Orbigny) from the Barremian beds of 
Atherfield, in the Isle of Wight {Geological Magazine, 1876, pi. 3, 
fig. 5, p. 107), but from both these species it differs in the possession 
of flattened or very slightly ventricose whorls, the presence of a 
bevelled posterior margin, and the absence of an anterior carination. 
Baily's S. ornata from the Upper Cretaceous of South-East Africa 
(Pondoland) is also a shell with much more convex whorls than the 
specimen from Zululand {Quart. Joicrn. Geol. Soc, 1855, vol. xi., 
pi. 12, fig. 2, p. 459), nor is this type of Scala known in the Creta- 
ceous rocks of either Northern Africa (Egypt, &c.) or Syria. 
For very similar reasons the species is not to be confused with 
any of the forms described by Stoliczka from the Southern Indian 
Cretaceous deposits (Cretaceous Gastropoda, Southern India, Pal. 
India, 1868, pp. 231-234). 
A relationship can be traced with two further species described 
by Mr. Gardner in the previously mentioned paper of the Geological 
Magazine, called Pyrgiscus gaultinus and P. woodivardi, both of 
Albian age, the former having been collected at Folkestone, the 
other at Blackdown. These shells have depressed whorls, an 
almost similar sculpture, and obscure traces, especially in P. gaul- 
tinus, of a bevelled margin to the upper part of the whorl, they are, 
however, of a less extensive basal diameter, whilst the last whorl is 
relatively more elongate. As the affinities of the shell are decidedly 
in favour of association with Gardner's species, it is strongly sugges- 
tive evidence that the Albian portion of the Cretaceous system should 
be recognised as its most probable period of origin. It may be 
mentioned that for those forms of the Scalidte possessing depressed 
whorls, Mr. Gardner adopted Phihppi's generic name of Pyrgiscus, 
but as that genus is recognised as a member of the Pyramidellidae, 
all of which have one or more folds on the columella and are besides 
of small size, it is considered more advisable on the present occasion 
