On Cretaceous Cephalopoda front Ztdifland. 



311 



lower Clausayes horizon == Zone III in Jacob.* Kilianf also puts this 

 horizon as the base of the Albian, but HaugJ has the Clausayes Beds 

 (= " /.one of D. nodosocostatum 71 ) as the uppermost Aptian. At any 

 rate, this East African fauna described by Zwietzycki includes higher 

 horizons than do the Aptiau faunas of Delagoa Bay and of the present 

 locality. 



If the latter come from one horizon, then it is probable that this 

 -cori-esponds Avith what is called the furcatus-zone (?) in the table 

 below. Stolley, probably wrongly, quoted Ch. cornueliamt/m from his 

 "Middle Grault " zone 1, which misled the writer when drawing up 

 the correlation notes, kindly inserted by Mr. L. Dudley Stamp in the 

 " Report of Excursion to Tilburstow Hill and Nutfield."!) The corre- 

 lation with Stolley's horizons of the Upper Aptiau, therefore, has here 

 been corrected : 



Upper Albian 



Middle Albian 



Lower Albian 



. Hor. IX-XIII (Folkestone) . 

 (Upper Gault) 



(Hor. I-VIII (Folkestone) 

 , j (Lower Ganlt) 



{' mammillatum bed.' 



. ,. I reqularis subz.. 



I tardefiircata z. > ?,, ,. 

 I { milletian. 



nodosocostat. z. V a< 



| nolam 



Hor. 7 (Stolley) VI (Jacob). 



6 



Upper Aptian . \subnodosocostatum z. 

 (Gargasian) . [furcatus z. (?) . 



(desliayesi z. 

 Lower Aptian . . . 

 ._-*-. . weissi z. 



/ T1 T 1* \ - M/GtO3l 



(Bedoulian) . |, (orfe - 



z. 



5 I 



4 / 



-' I 



1 ) 



5 



4 



IV 

 III 



lib 

 I la 



GEN. ACONECERAS, Hyatt, 1903. 



1. ACONECERAS NISOIDES, Sarasin sp. 



(PL XXVI, figs. 4 a, b, text-fig. B 9, p. 241.) 



1893. Oppel'm ti /so iiles, Sarasin. " Etude s. 1. Oppelia,etc." Bull. Soc. 



G-col. France (3), vol. xxi, p. 155, pis. iv-vi, figs. lOa-c, text-figs. 



3 and 5 (p. 154). 

 1902. Oppelia nisoides, Sarasiu. V. Koeueu, " Amm. d. Nordd. 



Neocom.," Abh. K. Pr. Geol. L. A., N.F., Heft 24, p. 51, pi. xlv, 



figs. 2 and 3. 



* Loc. cif. (1907), pp. 296 306. 



f Loc. cit. (1913), p. 341. 



I ' Traite,' p. 1 199. 



" Die GUied. d. Nordd. Unt. Kreide," ' Centralblatt f . Min.,' 1908, p. 242. 



y ' Proc. Geol. Assoc./ 1921, vol. xxxii, pt. 1, pp. 30-32. 



