236 Annals of the Soiiih African Museum. 



Grossouvre, to be quite different from Baily's species. On the other 

 hand, the specimen figured as M. texanum by de Grossouvre* agrees 

 with the example here described, both in the character of the 

 ornament and in whorl-section, though the inner whorls appear to be 

 quite different in so far as the fragmentary condition of the present 

 example permits of comparison. De Grossouvre's example may be iden- 

 tical with Hauer's A. texanus'f = A. quinquenodosus, Redtenbacher,+ as 

 Lasswitz thinks, if the thinness of the latter species is due to crushing, 

 but the writer cannot admit the same author's identification with M. 

 texanum of de Grossouvre 1 s M. campaniense, a form near to M. dela- 

 warense, with which, indeed, de Grossouvre || subsequently united it. 



M. umlcwelanense, Crick,^[ has much thicker whorls, with a square 

 section, but the specimen here compared with Crick's species,** owing 

 to the presence of a slight fifth (lateral) tubercle, is, perhaps, closer to 

 the example under examination than is the type. In both, however, the 

 umbilical tubercle is further away from the umbilical edge than it is 

 in M. sp. aff. soutoni, and whereas in M. umliivelariense and in the 

 close ally, described in this paper, the inner whorls are relatively more 

 coarsely ornamented than the outer, the reverse development is found 

 in the example here compared with M. soutoni. 



It may be added that the great variability of the species here dealt 

 with is shown in a large series of Mortoniceras from Pondoland in the 

 British Museum, referred by Crick to Baily's two species and to an 

 " intermediate " group. 



Locality. Umkwelaue Hill. Coll. Dr. A. L. du Toit. 



GEN. PSEUDOSCHLOENBACHIA, nov. 

 Genotype : A. umbulazi, Baily, 1855, pi. xi, fig. 4. 



A. umbnlazi, Baily, described as Schloenbachia by Woodsff and 

 Crick, ++ has been considered by Kossmat to belong to the " narrowly - 



* Loc. cit. (1894), pi. xvii, figs. 1 a, b, non pi. xvi, figs. 2-4. 



t "Ceph. d. Gosati-Sch." ' Beitr. z. Pal. v. Osterr.,' vol. i, 1858, pt. i, p. 10, 

 pi. ii, figs. 4-6. 



J Loc. cit., p. 108, pi. xxiv, fig. 3. 



" Kreide-Amm. v. Texas," ' Geol. und Pal. Abb. Koken,' N.F., vol. vi 

 (1904), p. 31. 



l| ' Recherclies s. 1. Craie Super.' (1901), p. 379. 



1 Loc. cit., p. 228, pi. xv, fig. 9. 



** See above, p. 234. 



ft Loc. cit. (1906), p. 336. 



JJ Loc. cit. (1907), p. 250. 



" Die Bedeut. d. Siidind. Kreideform., etc.," ' Jb. K.K.E.A.,' vol. xliv (1894), 

 p. 464. 



