314 L. F. Spath — Jurassic Atnmonites from East Africa. 



agrees with the whorl-outline of the specimen here described. In 

 Neumayr's figure of Phylloceras Kudernatschi the ventral area is 

 truncated ; but this flattening is shown neither in the type nor in the 

 other illustrations cited, though Dr. Till ^ apparently lays stress on it. 



The suture-line of the tyj)e is slightly more complicated than the 

 one here reproduced (Fig. Ic), as is also that given by Neumayr, 

 and especially the saddles are slenderer. This difference, however, 

 is accounted for by the different size of the specimens. Neumayr's 

 figure, on the other hand, shows exactly the same endings of the 

 saddles as far as the third auxiliary. 



The bundling of the striae seems to become more pronounced in the 

 larger specimens only, but the fact that the ornament is worn in 

 the specimen under consideration gives it a certain resemblance to 

 Phylloceras modestum Tornquist ^ from the Sonninia beds of the 

 Espinazito Pass. This form, however, is thinner, and has a larger 

 umbilicus (9 per cent). 



Horizon and Distribution. — Neumayr and Uhlig ^ stated that 

 (down till 1892) Phylloceras Kitdernatschi was known only from 

 the Mediterranean Klaus beds = Lower Bathonian = zone of 

 Parhinsonia, ferruginea. But in some of the beds referred to this 

 horizon, e.g. the haematite beds of Swinitza or the Posidonomya 

 alpina beds of the Italian Alps, the fusca and even the aspidoides 

 zones of the Bathonian seem to be represented in addition to the 

 lower zone. Haug * records Ph. Kudernatschi from the Bajocian 

 (zone of Cosmoceras suhfurcatum = niortensis up to zigzag hemeree 

 probably) of the Basses-Alpes. The species has also been found in 

 the Grlarner Alps of Switzerland, near Hallstatt, Gosau, A^ienna, etc., 

 in Austria, in the Carpathians, in Sicily, and in the Caucasus. 



Locality. — No. 19. Frombeside the coral limestone on the Mombasa 

 pipe-line at mile V-- (Single specimen.) 



Phylloceras sp. indet. (PI. V, Figs. 2a-c.) 

 Dimensions. — Diameter . . 25 mm. 



Height of the last 



whorl , .58 per cent of the diameter. 



Thickness . .42 ,, ,, ,, 



Umbilicus . .4 ,, ,, ,, 



Description. — This specimen consists of a little over half a whorl 



(wholly septate) ; and it has been rolled, so that though fragments 



of the test remain there is no trace of the ornament. The ammonite 



is very similar in shape to the specimen above referred to Phylloceras 



Kudernatschi, but a little thicker (42 per cent instead of 38 per cent), 



• 1 "Aram. Fauna d. Kelloway v Villany": Beitr. Pal. Gaol. Ost.-Ung., 

 vol. xxiv, pt. ii, 1911, p. 255. 



^ " D. Dogger a. Espinazito Pass" : Pal. Abh. Dames, N.F., vol. iv, pt. ii, 

 1898, p. 29, pi. V (xviii), fig. 2. 



3 Op. cit., p. 33. 



■* " Les Chaines Subalpines, etc." : Bull. Service Carte Geol. France, iii, 

 No. 21, 1891, p. 74. 



