226 Annals of the South African Museum. 



which is a pachydiscoid development (Parapachydlscus) later than 

 P. denisoniana, and which has Pwaosm-like inner whorls, is also grouped 

 here by JSTowak. But the forms that continue the Pusosia-type into 

 the Senonian (P. ijaitdama, Forbes, P. indopacifica, Kossmat, etc.), and 

 once more produce transitional forms to Kossmaticeras (P. danvini, 

 Philippi in Steiumann), cannot be classed in the same genus with 

 P. (It'iiixnuinna- which developed a " Pachydiscus-st&ge " already in the 

 Turonian.* 



The inclusion of the Zululand example in this polyphyletic genus, 

 then, is only provisional, and based on the assumption that 

 P. da^(,breei is the genotype of Parapuzosia . The ornamentation of 

 the inner whorls shows that it is not a Parapachydiscns and the 

 writer believes that it has nothing to do with the gigantic forms of 

 the type of P. sepjoem*aden.sis, Landois,t which Nowak,^ in the writer's 

 opinion wrongly, also considers possibly to belong to Parapnzosla. 



Locality. Railway cutting, Umfolozi. Coll. Dr. A. L. du Toit. 

 S.A.M. Cat, No. 5513. 



GEN. PARAPACHYDISCUS, Hyatt, 



2. PARAPACHYDISCUS sp. nov. aft'. COLLIGATUS, Binkhorst sp. 

 (PI. XXII, figs. 1 a, 6.) 



1861. Ammonites colligatus, Biukhorst. Mou. d. Gast. & Ci'ph. de la 

 Craie Sup. d. Limbourg, ii, p. 25, pi. viii a only. 



1894. Pachydiscus colligatus, de Grossouvre. Amm. Craie Super., p. 202. 



1908. Pachydiscus colligates, de Grossouvre. Descr. d. Amm. d. Crc't. 

 Sup. du Limbourg, etc. Mem. Mus. Roy. d'Hist. Nat. Belg., 

 vol. iv (1908), p. 28, pis. iv-viii. 



' f Forbes ('Trans.,' 2nd ser., vol. vii, 184(5, p. 114) stated that there was a 

 " fragment of a very large Ammonite, but undeterminable, among the specimens 

 from Trichinopoly." This example, now in the British Museum (Geol. Soc. 

 Coll.), probably belonged to a form of this group of " Puzosia," but consists of 

 one camera only (H. = 170 mm. and Th. just a little less). The extremely 

 complex lateral lobe and short siphonal lobe are like those in P. denisoniana, 

 as figured by Kossmat (loc. cit., pi. xiv, fig. (3), but there is no ornamentation 

 remaining- at this pachydiscoid stage. 



t " Die Eiesen-Amm. v. Seppenrade," 23. Jahresb., ' Zool. Sect., Westfal. 

 Prov.-Ver. f. Wiss. and K.' (1895), pp. 99-108, pis. i and ii. 



t Loc. cit. (1913), p. 365. 



Kossmat (loc. cit., p. 166 [101]) considered the two species, colligatus and 

 otacodensis, to be closely allied, but the latter is quite different, judging by 

 Kossmat's own identifications in the British Museum collections. 



