318 Antialf of the South African Museum. 



Kilian noti Pavlow sp.,* A. tobleri, Jacob sp.,f and Sinzow's various 

 Caucasian Acanthoplites'l) show the peculiar ventral flattening of the 

 costation that is only just indicated in Kreukel's species. The 

 Acanthoplite* of the miUetiamis-jacobi group found in North 

 Germany (Schrammeu, Collet, etc., Colls., British Museum) belong 

 to a different group again. On the other hand, there is a superficial 

 resemblance to certain Calycocems of the Cenomaniau, notably to 

 C. baylei, Pervinquiere, or to the form figured by Vilauova. 



Kilian || first named this species Acanthorenta (Parahoplites) abichi 

 (Anthula) var. ufricana, but Krenlcel drew attention to the differences 

 between the African and the Caucasian forms. The suture-line 

 confirms this separation of Ch. < I >! monetise from Acanthoplites abichi, 

 which latter belongs to the bergeroni-bigoureti group, and was, indeed, 

 united with the last species by Pervinquiere. If 



The genus Paraspiticercis, which shows a change to costation, 

 following on tuberculation, does not have the slightly sigmoidal 

 ribbing which approaches the present example so much to the inner 

 whorls of the Acantlioplites bigoti figured by Sinzow (1907) on pi. iv, 

 fig. 18. 



EXPLANATION OF PLATES XIX XXVI. 



PLATE XIX. 



FIG. 



1. Diaziceras tissotiaeforme, gen. and sp. nov. Upper Senouian, Unikwelane 



Hill. Specimen No. 5478, p. 245. a. Side view of holotype. 5. Peri- 

 pheral view, not quite central, c. Sectional outline, at diameter = 

 50 mm. d. Inner whorls, at diameter = = 3 mm., x 15. The keel 

 appears at a diameter of about 25 mm. e. Adult suture-line, x 2, 

 external portion, f. Internal portion of same. g-k. Development of 

 suture -line, at diameters of 1'5 mm. (//) ; 2 mm. (h) ; 3 mm. (t) ; 5'5 mm. 

 (j) ; 8 mm. (). All greatly magnified. 



2. Parapuzosia sp. nov. ? ind. Upper (?) Seiionian, Railway Cutting, Umfulozi. 



Specimen No. 5513, p. 224. Reduced about J-. After a photograph sent 

 by Dr. A. L. du Toit. 



* Pavlow's form ('Argiles de Speeton,' 1892, p. 152, pi. xi. figs. 20 and 21), 

 according to specimens in the British Museum and information kindly given 

 by Mr. Lamplugh, does not belong to this family and formation. 



t Loc. cit. (' Engelberger Aa,' 1906), p. 11, pi. ii, figs. 4-6 (Parahoplites). 



I Loc. cit. (1907), pi. v. 



'Mem. Geogn. d. Castellon,' pi. ii, fig. 5 (as A. mantelli). The A. cor- 

 inielianus (ibid., fig. 11) of this author is considered by Kilian (1913, p. 341) 

 to belong, probably, to Ch. albrechti-austriae, Hohenegger sp. 



|| Loc. cit. (1902), p. 465. 



^ Loc. cit. (1907), p. 195. 



