On Cretaceous Cephalopoda from Znluland. 281 



D. cottadoni, Pictet sp.,* is too compressed and too evolute ; and, in 

 the sectional view, the outer tubercle is not prominent enough ; but 

 the character of the ribs, with an occasional rib that does not reach to 

 the umbilical border, is very similar. There apparently is no inner 

 tubercle in this small species, but the high umbilical border, shown in 

 Pictet's fig. 1 6 indicates how the line of minute inner tubercles (of 

 some of the costae) of the specimen here described first arises. On 

 the other hand, in such a form of Subschloenbachia / as Quenstedt's 

 evolute "A. varicosus,"-f with the Dipoloceras keel still retained, the 

 inner tubercle has become strongly developed, and the ribbing has lost 

 its flexiradiate and peculiar wedge-shaped character. 



Locality. Middle Branch, Mauuan Creek. Coll. W. J. Wybergh. 



GEN. PSEUDOPHACOCEEAS, nov.J 



Genotype: A. roissyanus, d'Orbigny, 'Pal. Franc. Ter. Cret.,' p. 302, 

 pi. Ixxxix. 



7. PSEUDOPHACOCERAS MANXJANENSE, 11OV. 



(PI. XXV, figs. 1 -d.) 



1907. Scliloenbachia sp., Crick. "Cret. Foss. Natal (III)," Third 

 Eeport, Geol. Surv. Nat. and Zulul., p. 240. 



This species is represented by two specimens, the larger of which 

 is taken as type. Their dimensions are as follows : 



No. 2725. No. 272(5. 



Diameter. . 235 inm. (at) 80 mm. 



Height of last whorl 45 per cent. 52 per cent, of the diameter. 



Thickness 20 22 



Umbilicus . . 21 ,, 15 ,, 



At a diameter of 170 mm. the umbilicus of the large example is 

 only 16 per cent., and the uncoiling that leads to an excentrurnbilicate 

 (scaphitoid) shell is confined to the last half -whorl, belonging to the 

 body-chamber. At a diameter of 80 mm. there are 20-22 primary 

 ribs per whorl ; they bifurcate at varying distances from the umbilical 

 border, and one branch bifurcates again higher up, so that generally 



* Iii Pictet & Eoux, loc. ell. (1847), p. 89, pi. viii, figs. 1 a, b. Pictet & 

 Campiche (loc. cit. [1859], p. 175) wrongly united this species with J. de C. 

 Sowerby's Brancoceras symmetricum. 



t Non Sowerby (' Cephalop./ 1849, pi. xvii, fig. 2). 



$ Dealt with in the writer's Angola paper, above referred to. 



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