818 L. F. Spath — Jurassic Ammonites from East Africa. 



is very near to the present specimen both in whorl-shape and suture- 

 line. The latter also greatly resembles Ph. Riazi de Loriol ^ from the 

 Renggeri marls. The very complicated suture-line of the latter, 

 however (at equally small dimensions), is distinguished by a lesser 

 number of elements. 



Horizon and Distribution. — Phylloceras Kunthi is widely dis- 

 tributed in the Callovian of the Mediterranean region (Austrian Alps, 

 Hungary, Sicily, Daghestan, and India). The type comes from the 

 zone of Macrocejolialites niacrocephalus . Haug ^ records this species 

 with Ph. disputabile, Protetragonites tripartitum, and other Bathonian 

 fossils from Chaudon, Basses- Alpes, whereas the ammonites doubt- 

 fully referred to it by Waagen ^ and Neumayr et Uhlig ^ came from 

 the at?deta beds. 



Locality. — No. 550/1, Mwachi River, Pipe-line Crossing. Found 

 together with Protetragonites cf. tripartitum Raspail sp. and 

 Hecticoceras sp. juv. 



Phylloceras cf. disputabile Zittel. (PI. V, Figs, ia-d.) 



1893. Phylloceras disputabile (Zittel) Pompeckj, loc. cit. : Revision, p. 32. 



See there for synonymy. 

 1905. ,, ,, (Zittel) T^opovici- Hatzeg, loc. cit., p. 13, pi. ii, 



figs. 1-9, text-fig. 3 on p. 13, figs. 4 and 5 on 



p. 1-4. 



Dimensions. — Diameter . . ? 28 mm. 



Height of the last 



whorl . . ? 55 per cent of the diameter. 



Thickness . . ? 30 ,, ,, ,, 



Umbilicus . . ? 14 ,, ,, ,, 



Description. — This specimen consists of a whorl-fragment, about 

 27 mm. long, and the above measurements are based on the 

 restoration of the complete shell given in Fig. 4&. The fragment is 

 worn, and there is no trace of the shell-ornament left. The rounded 

 umbilical edge is apparently preserved near the smaller end, and 

 the sectional view, given in Fig. 4c (magnified two diameters), is 

 drawn from this portion. Fig. 4a shows the (morphologically) left 

 side of the specimen, which is poorly preserved, and does not show the 

 constrictions. On the opjDosite side, represented in Fig. 46, the two 

 constrictions are present, but they become indistinct on the lateral 

 area. The constrictions pass across the periphery with a slight 

 forward bend, but the forward convexity at the side and the 

 umbilical curve, indicated in the figure, are hardly distinct enough 

 to warrant a definite description of their course. The sides of the 



^ " Etude sur les Moll et brach. de I'Oxf. Inf. d. Jura Bern." : Mem. Soc. 

 Pal. Suisse, vol. xxv, 1898, p. 110, pi. viii, figs. 8-12 and text-fig. 29 on p. 111. 



- TraiU de GMogie. vol. ii, fasc. 2, 1908, p. 1023. 



^ " Jurassic Fauna of Kutch " : Pal. Indica, ser. ix, vol. i. 1873, p. 25, 

 pi. V, fig. 2. 



* Loc. cit., 1892, p. 33. 



