L. F. Spath — Jurassic A'^nr^ionites from East Africa. 817 



Ph. Kunthi Neumayr, but is more rounded, and therefore nearer to 

 the form described as Phylloceras n.sp. ind. by Popovici-Hatzeg, 

 and compared with Ph. Kunthi. The thickness of the adult Ph. 

 Kunthi is only 28 per cent of the diameter, but the inner whorl of the 

 type-figure at a diameter still more than three times that of the 

 specimen here described shows this thickness already increased to 

 32 per cent. The suture-line of Ph. Kunthi, according to Neumayr, 

 is distinguished from that of Ph. Kudernatschi by a tetraphyllic 

 first lateral saddle and a larger number of lobes. Dr. Till ^ also states 

 that the suture-line of the flatter '" Callovian " Ph. Ktinthi is 

 distinguished from that of the thicker Bathonian Ph. Kudernatschi 

 by more numerous and more indented elements. In the small 

 specimen under examination the first lateral saddle does not, of 

 course, attain the great comj)lexity of that of Neumayr's figure. 

 The flatness of the periphery on which Till insists is not shown on 

 the inner whorls, and, probably like that in Neumayr's figure of 

 Ph. Kudernatschi, is accidental. The present specimen, however, 

 is not definitely identified with Ph. Kunthi on account of its 

 immaturity. 



The very compressed Ph. 2oer2)lanum Prinz '^ seems to belong to the 

 same group of forms, but apparefttly in all the Bajocian species of 

 the heterophi/llum group the suture-line has undivided terminal 

 leaflets to the saddles. On the other hand, there is a likeness to the 

 suture-line of Ph. subohtusum Kudernatsch,^ though whorl-shape, 

 ornament, and umbilical rim are very distinct in tliat species. The 

 specimens figured as Ph. suhobtusimi by Popovici-Hatzeg,^ however, 

 agree much better with the East African specimen. Only the 

 umbilicus is larger ; and Popovici-Hatzeg also states that up to a 

 diameter of 25 mm. the shell is perfectly smooth. 



Till * also describes a Ph. aff . plicatum Neumayr from the 

 Callovian of Villany. Neumayr's figure ^ (at a diameter of 58 mm.) 

 shows a whorl thickness of 36 per cent, which agrees very well with 

 that stated above for Professor Gregory's specimen. The absence 

 of the test on the latter, however, prevents closer comparison ; 

 besides, Ph. plicatum is Argovian, though apart from Hungary 

 it has also been recorded from the Callovian of the Maritime Alps 

 and of the Swiss Jura. 



Of later forms, Ph. isotypum Benecke,^ a species of the acantliicus 

 zone (but recorded from the himammatum, zone by Pompeckj ®), 



^ Log. cit., p. 252. 



^ Loc. cit., p. 38, pi. xxvii, figs. 3, 4. 



^ Loc. cit., 1852, pi. ii, figs. 1-3. 



* Loc. cit., 1905, pL ix, fig. 9 especially. 

 = Loc. cit., 1910, p. 254. 



* Loc. cit., 1871, pi. xii, fig. 7 (inner whorl). 



■^ X]h. Trias u. Jura i. d. SiJdalpen " : Geogn. Pal. Beitr., 1865, p. 184, pi. vii, 

 figs. 1. 2. 

 ^ Beitr. Eevision Amm. Schirdb. Jura, 1893, pt. i, p. 29. 



