Cretaceous Gastropoda, and Pelecypoda from Zulidand. 29 
longitudinal lines ; the bicarinate area is slightly concave and bears 
the same character of ornamentation as the remaining part of the 
whorl, with the exception that the spiral lines appear to be more 
numerous and more delicate whilst the longitudinal striations are 
mostly coarser. 
Dimensions (specimen without spire). — 
Length 32 mm. 
Width 19 
Observations.- — This Gastropod is represented by a matrix-cavity 
associated with Inoceramus expansus, Baculites (see p. 96), &c., its 
characters being drawn up from a wax squeeze. Although only 
the body-whorl is preserved, and that a dorsal view, it appears to 
be closely related to Semifusus ? {Mayeria ?), sp., figured by Mr. H. 
Woods from the Campanian of Pondoland [Ann. South African 
Museum, 1906, vol. 4, pi 40, fig. 5, p. 324), both exhibiting the 
bicarinate character, a similar surface structure, and a depressed 
posterior region above the periphery of considerable width. 
A similarly related form is also met with in the Ariyalur Cretaceous 
of Southern India, that is, judging from a specimen described and 
figured by Stoliczka as Lagena secans (Cretaceous Gastropoda, 
Southern India, Pal. Indica, 1867, pi. xi., fig. 20, p. 138). Certain 
resemblances likewise can be traced with Semifusus dakotensis 
var. Vancouver en sis of Whiteaves, from the Upper Cretaceous of 
Vancouver and Dakota (Mesozoic Fossils, Geol. Surv. Canada, 1879, 
vol. 1, pi. 15, fig. 5, p. 119 ; and Meek, Eept. Invert. Cretaceous and 
Tertiary Fossils, Upper Missouri Country, United States Geol. Surv. 
Territories, 1876, pL 32, fig. la, p. 375), although that form is 
inclined to show a more or less nodose peripheral keel, whereas the 
specimen from Zululand does not appear to possess these ornaments. 
Two further species might well be placed with the genus Semi- 
fusus, viz., Fusus alhensis, of Orbigny (Pal. Francaise, Terr. 
Cretaces, Gasteropoda, 1842, pi. 222, figs. 8-10, p. 334), and Fusus 
(Murex) quadratus, J. de C. Sowerby {Trans. Geol. Soc. London, 
1836, Ser. 2, vol. 4, pi. 18, fig. 17, p. 343, and Mineral Conchology, 
1823, vol. 5, pi. 410, fig. 1, p. 7), both of which are of Albian age 
and exhibit the bicarinated character. Notwithstanding these 
records this genus was not particularly common in Cretaceous times, 
being probably better known in the Tertiary epoch, one of the most 
familiar species being Solander's Stromhus errans, found in the 
Barton Beds of Hampshire. It is interesting to mention that M. 
Cossmann has refei-red to S. errans and other forms of Semifusus 
under Bellardi's ''Mayeria,'' in his Essais de Pal^oconchologie 
Compar^e," 1901, part 4, p. 93. 
Locality. — Umkwelane Hill. 
