30 
Transactions of the Boyal Society of South Africa. 
Family EINGICULID^. 
Genus AVELLANA, Orbigny, 1842. 
Pal^ontologie Francaise, Terr. Cretaces, Gasteropoda, 1842, p. 131. 
AvELLANA cf. iNCRASSATA, J. Sowerby. 
Plate VIIL, figs. 6-8. 
Auricula incrassata, J. Sowerby, Mineral Conchology, 1817, vol. 2, 
pi. 163, figs. 1-3, p. 143 ; Mantell, Geology of Sussex, 1822, 
pi. 19, figs. 2, 3, 34, p. 110. 
Avellana incrassata, Orbigny, Paleontologie Francaise, Terrains 
Cretaces, Gasteropoda, 1842, pi. 168, figs. 13-16, p. 133 ; Jukes- 
Browne and Hill, Cretaceous Eocks of Britain, Gault, &c., Mem. 
Geol. Surv. United Kingdom, 1900, p. 461. 
Observations. — The collection contains a single specimen of 
Avellana, which shows affinities with the incrassata of James 
Sowerby, a characteristic species of Albian deposits although found 
as well in rocks of Cenomanian age. The specimen is a good 
deal fractured at the aperture, so that the prominent outer lip is 
altogether absent, but in most other respects it agrees with the 
characters as originally defined, viz., " ovate, ventricose, transversely 
sulcated, longitudinally striated ; spire short ; mouth angular above, 
with very thick lips ; columella three-plaited." A difference is 
noticeable in this last character, as only two plaits are recognisable 
on the present shell — a phenomenon not altogether unusual as an 
examination of some Blackdown specimens readily shows, because 
among such are certain forms with two as well as three folds on the 
columella. The short longitudinal striations between the spiral 
ridges are well preserved although of microscopical size, being clearly 
definable with the aid of a good lens and observed to be equi- 
distantly arranged. It appears to differ from Eriptycha peramjjla 
(= Avellana ampla, Griesbach non Stoliczka) of Mr. H. Woods from 
the Cretaceous of Pondoland {Annals South African Mtiseum, 1906, 
vol. 4, part 7, pi. 41, fig. 2, p. 329) by reason of its more elongate 
form, as well as possessing longer and more developed striations 
between the spiral ridges. So far as can be ascertained without 
actual specimens for comparison, the shell from Zululand is different 
from any of the forms described by Stoliczka as belonging to the 
Indian Cretaceous series. 
Dimensions. — 
Height 15 mm. 
Diameter (max.) 10 ,, 
Locality. — Tributaries of the Manuan Creek. 
