On the Senonian Ammonite Fauna of Pondoland. 131 
accompanying the keel (of test only) at 90 rnm. diameter, and specimen 
No. C 18535 has a very strong keel, just beginning to become undercut, as in 
H. rembda, at about 110 mm., set on the far less acute periphery of the cast. 
Forbes's type of H. rembda, on the other hand, shows the acute periphery 
of the cast, and the peculiar polygonal keel already at 30 mm. diameter. 
This keel is a more distinct characteristic of H. rembda than the biconvex 
constrictions. 
The suture-line of H. gardeni (Baily's paratype 11371) differs from that 
of H. sulcatum, as figured by Nowak, in the very regular decrease of 
the three auxiliary saddles down to the umbilical lobe, a character shown 
also in some Japanese examples before the writer (Geol. Soc. Coll.). In 
the latter, however, the periphery is more compressed than in H. gardeni 
typus, or in H. fayoli, which latter species they resemble in their con- 
strictions. 
H. gardeni, in the present collection, is associated, in the same hand- 
specimens, with Mortoniceras, Pseudoschloenbachia, and Spheniscoceras. 
15. Hauericeras rembda (Forbes). 
1921. v. Hoepen, loc. cit., p. 28. 
1921. Spath, loc. cit., table to p. 50. 
This species is not represented in the present collection or apparently in 
Dr. van Hoepen's material, but was recorded by G-riesbach and Woods.* 
16. Hauericeras \ sugata (Forbes). 
1921. Desmoceras compactum, v. Hoepen, loc. cit., p. 21, pi. iv, figs. 5-7, 
text-fig. 12. 
1921. Hauericeras ? sugata (Forbes), Spath, Pondoland, p. 46, pi. vi, 
figs. 3a, b. 
Dr. van Hoepen's single immature example hardly justifies the creation 
of a new species, though it is possible that the Pondoland form may not be 
of the same date as Forbes's type. The writer assumed {loc. cit., p. 54) that 
Desmoceratids of the group of A. sugata have a fairly wide vertical range. 
Probably derivatives of several desmoceratid stocks, in the present case 
Schliiteria, successively became carinate and consequently have all been 
included in this well-known species. There is, however, no satisfactory 
character to warrant the separation of the immature Pondoland examples 
from Forbes's species. 
* Loc. cit. (1906), p. 333. 
