On Cretaceous Cephalopoda from Zululand. 287 



A whorl-fragment (No. 4939) of a specimen of about 35 mm. 

 diameter, with the umbilical portion imperfectly preserved, appears to 

 belong to a flexicostate form of this genus, like some of the varieties 

 of S. dispar, d'Orbigny sp., figured by Choffat and by Pictet & 

 Campiche.* The square whorl-section agrees with that of S. clavigera, 

 Neumayr,t but in this species, as in the still more quadrate-whorled 

 S. tetragona, Neumayr,^ the costation is too straight. There are 

 nine ribs on the fragment, very thick on the periphery, and of 

 varying lengths. 



The specimen of -S'. clavigera from Madagascar, figured by Boule, 

 Lemoine and Tlieveniu, has the inner whorls too poorly preserved for 

 comparison with the much smaller fragment here described. 



It should be mentioned that there is no indication of tuberculatiou 

 on the periphery, such as is shown in Choffat's figs. 5 and 7, in Pictet 

 and Campiche's fig. 1&, and in Stoliczka's fig. 3 a feature that becomes 

 permanent in the later Mantelliceras, e.g. M. hoplitoides, Lasswitz,|| 

 and M. martimpreyt (Coquaud), Perviuquicre.^f Mantelliceras is 

 known to occur in Zululand,** but the presence of a Stoliczkaia in the 

 Mauuan Creek Fauna is of interest in vieAv of the occurrence of this 

 genus in India and Madagascar, on the one hand, and in Angola and 

 North Africa on the other. 



Locality. South side of Manuan Creek Valley. Coll. W. J. 

 \Y v bergh . 



" Loc. cit. (1>S(>0), pi. xxxviii. S. dispur, d'Orbigny sp., and S. notha, Seeley 

 sp., are too compressed and too rounded ventrally. 



t In Stoliczka, luc. cit. (1865), pi. xlv, fig. 1 (refigured in Lasswitz, ' Kreide 

 A. v. Texas,' loc. cit., pi. iv, fig. 2), and fig. 3 (refigured Kossmat, loc. cit., 

 pi. xxiv [x], fig. 2). Kossmat included the Angola specimens in &'. clavigera 

 Neumayr, but they belong to several distinct varieties. 



J In Stoliczka, loc. cit., pi. xlv, fig. 2. 



Loc. cit. (1907), pi. ix, fig. 1, p. 33 (apparently reduced by half, though 

 stated to be natural size). 



l| Loc. cit. (1904), p. 19, pi. iii (xv), fig. 3. The suture-line of this form 

 (text-fig. 4, p. 19) is little advanced from that of LyelliceratideB, so that Man- 

 telliceras is not a direct descendant of Stoliczkain, but more or less a parallel 

 development with Neophlt/cticer/i.t, nov. (genotype = A. Irottianus, d'Orbigny, 

 ' Pal. Fran*;. Ter. Cret.,' pi. Ixxxv, figs. 8-10), and Stoliczkaia, of LyelliceralidfE. 

 (See, however, Nowak, " Unters. Cephal. Ob. Kreide Pol.," II. Skaphiten, 'Bull. 

 Acad. Sci. Cracovie,' July, 1911, p. 55-i, text-figs. 1 and 2.) 



T Loc. cit. (1907), pp. 289 and 389. 



** E. g. M. chnff'ati, Kossmat sp. 



