336 Annals of the South African Museum. 



Gaiulryceras denmanense, Whiteaves,"'' from the Nanaimo Group 

 of Vancouver, is included by Kossmat in G. Kayei, but is regarded 

 by Yabe as a distinct species. 



Genus HOLCODISCUS, Uhlig. 



HoLCODiscus, sp. 



Plate XLII., fig. 2. 



Description. — Shell discoidal, compressed, consisting of about 

 four whorls. Last whorl with flattened, convergent sides, and 

 rounded periphery ; its greatest thickness is near the umbilicus 

 and is equal to about | of the height ; its height is about {'^ of the 

 diameter. Umbilicus small, with a steep margin, at the summit of 

 which are a few pointed tubercles. 



Whorls ornamented with small flexuous ribs. Last whorl with 

 seven rather strong ribs bounded on each side by a furrow ; the 

 ribs are slightly sigmoidal, being convex forwards on the inner half 

 of the whorl, concave on the outer half ; they cut the external 

 margin obliquely. Between the stronger ribs are several small ribs, 

 some of which start from the tubercles at the umbilical margin ; a 

 few of the ribs bifurcate and new ribs are introduced on the outer 

 portion of the whorl. Sutures not seen. 



Diameter 26 mm. ; height 12 mm. ; thickness 8 mm. 



Bemarks. — There is only one example of this species. It appears 

 to be distinct from the Indian species described by Stoliczka and 

 Kossmat. In general form and in the occurrence of tubercles at the 

 umbilical margin it shows some resemblance to H. maclrasinus. 

 Stoliczka,! from the Ariyalur Group, but the ribs are much finer. 



Genus SCHLCENBACHIA, Neumayr. 



ScHLCENBACHiA Umbulazi (Baily). 



1855. Ammonites Vmbulazi, Baily, Q.J.G.S., xi., p. 456, pi. xi., fig. 4. 



1871. Ammonites CJ/ufeo/a^?', Griesbach, Q.J.G.S., xxvii., p. 63, pi. iii., 



fig.l. 

 1904. Muniericeras (?) Umbolazi, Solger, Foss. Mungokreide in 

 Kamerun, p. 205. 



Between 20 and 30 specimens of this species have been obtained 

 by Griesbach and the Survey. One example has a diameter of 



* Mesozoic Fossils (Geol. Survey, Canada), vol. i. (1879), p. Ill, pi. xiii., fig. 3, 

 and (1903) p. 329. Trans. Eoy. Soc. Canada, ser. 2, vol. 1. (1895), p. 129, pi. ii., 

 figs. 1, 2. Ottawa Naturalist, vol. xv. (1901), p. 32. 



t Cret. Fauna S. India (1865), p. 139, pi. Ixx., figs. 1-3. 



