On Cretaceous Cephalopoda from Zulu land. 255 



young of Emperocems simplicostatum, Whitfield sp., to Oxybeloceras 

 shows that the interrelations of these genera are very complicated, and 

 that the determination of mere fragments is very difficult, 

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



15. BOSTKYCHOCERAS? sp. illd. 



(PI. XXIV, fig. 2.) 



An impression (No. 5478A) of a whorl-fragment of a form allied to 

 the Heteroceras sp., figured by Woods* but with only three, not four, 

 intermediate ribs and the flares much closer together, is doubtfully 

 referred to the genus Bostrychoceras. In a length of about 40 mm. 

 there are six of these flares, as against four in the Pondoland example. 

 This closeness of the costation approaches the form to " Helicoceras (/) " 

 ven itstii at, Ya bef and "Helicoceras" scalare, Yabe,+ but these have 

 more numerous intermediary ribs and may possibly belong to 

 Hyphantoceras. The peripheral portion of the impression here 

 described, and its whorl-section being unknown, comparison with 

 "Helicoceras''' breu'eri, Grabb, and " Crioceras (/) " flmjitlatum, 

 Schliiter,|| is difficult. They also represent similar fragments with 

 flares, apparently connected with the typical Bostrychoceras by such 

 forms as B.jwponicum, Yabe sp.^f 



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

 in matrix of specimen 5478 = Diaziceras tissotiaeforme, nov.) 



such forms ;is " Hamites " phaleratus, Griepenkerl (" Verstein. d. Senon. Kreicle 

 v. Konigslutter," ' Pal. Abh.,' vol. iv ( 1889), Heft 5, p. 104, pi. xi, fig. 3, and pi. xii, 

 figs. 3 and 4), " Ancyloceras " pseudo-armatum, Schluter (loc. cit., p. 164, pi. xliii, 

 figs. 8 and 9, ? 5 7), and " Ancyloceras " kossmati, Simionescu (" Fauna Cret. Sup. 

 d. 1. Urmos.," 'Acad. Romana,' Publ. Fd. Vasilio Adamachi, No. 4 (1899), p. 21, 

 pi. i, figs. 68). A beautiful, but fragmentary, example of a new form of this 

 group, comparable with " Hamites " quadrinodosus, Jinibo sp., from the Umzamba 

 beds of Pondoland (Coll. Geol. Survey), was sent to the writer, after the com- 

 pletion of this paper, through the kindness of Mr. Henry Woods. The Durban 

 Museum Collection, already referred to, also includes Oxybeloceras ? sp., cf. 

 interruptum, Schluter, and ivernickei, Wollemann sp. ; further, several gen. nov. 

 (Hyphantoceras?) cf. spini<jcrum, Jimbo sp., all from the Pondoland Senonian. 



* Loc. cit. (1906), p. 339, pi. xlii, fig. 4. 



t Loc. cit. (1904), p. 11, pi. iii, fig. 4. 



X Ibid., p. 9, pi. iii, figs. 2 and 3. 



Loc. cit., vol. i, p. 72, pi. xiv, fig. 22 (Upper Chico in Anderson, p. 27). 

 | Loc. rit., p. 101, pi. xxx, figs. 13 and 14. 



If Loc. cit., p. 17, pi. iii, fig. 8. 



