On the Senonian Ammonite Fauna of Pondoland. 
115 
monograph in 1906. In this paper * Woods also mentioned that Crick 
hoped to give an account shortly of other Pondoland species of Eulophoceras 
in the British Museum. The omission of any reference to this genus, pro- 
posed by Hyatt in 1903, in the (meaningless) description of the new genus 
Spheniscoceras as "intermediate between Placenticeras and Sphenodiscus," 
may indicate that Crick's account was written before 1903 ; a copy of 
Hyatt's description of the genus Eulophoceras, however, was added at the 
end of the MS. by Mr. Crick with the remark, " Not represented in this 
collection." This the writer is at a loss to understand, considering the 
close affinity, if not identity, with Eulophoceras, of Crick's genus Sphenisco- 
ceras. There are, also, discrepancies, e.g. in the naming of some of the 
forty-three examples of Mortoniceras, none of which is described in the MS.; 
but a revision of Crick's MS. has now become unnecessary, for recently 
Dr. van Hoepen f dealt with many of the forms described by Crick. Accord- 
ingly, only a few short extracts from Crick's MS. will here be given, and it 
is hoped that a general account of the collection and a revision of the generic 
nomenclature of all the Pondoland Ammonoidea will prove of general 
interest. 
It has been considered advisable to include in the present paper a review 
of the very important genera Pachydiscus and P arapachy discus . When 
describing some of the forms of this group in the " Cretaceous Cephalopoda 
from Zululand," the writer recognised that Nowak's J treatment of the 
genus Pachydiscus, including in that one polyphyletic genus a host of 
Upper Cretaceous Ammonites of many horizons, was unsatisfactory. 
Much additional work, however, remained to be done, and even now, in the 
absence of original material, it is feared that the interpretation of a number 
of species here referred to must be based merely on the published descrip- 
tions and figures. The genotype species, however, or at least representative 
forms of the various lineages here recognised, are preserved in the British 
Museum collections. This revision was necessary to enable the writer to 
place some undescribed new forms, simply labelled " Pachydiscus " by 
Mr. Crick, but is provisional. The whole family Desmoceratidae, with its 
trachyostracous descendants, including the " Prionotropidae," will be 
dealt with in the writer's forthcoming " Monograph of the Gault Ammo- 
nites." 
After the writer's observations on the Pondoland fauna § were penned, 
an account of the stratigraphy of the Umzamba Beds by Mr. W. J. Plows 
* Annals S.A. Mus., iv, pt. vii. No. 12, 1906, p. 337. 
t " Cretaceous Cephalopoda from Pondoland," Ann. Transv. Mus., viii, 1921, pt. 1. 
% " Untersuch. ii. d. Cephalop. d. Ob. Kreide in Polen," pt. iii, Bull. Acad. Sc. Cracovie, 
CI. Sc. Math, et Natur., ser. B, Sc. Nat., Juin 1913, pp. 337 and ff. 
§ Loc. cit. (Pondoland), pp. 53-56. 
