294 DR. L. F. SPATH ON [vol. lxxix„ 



New Caledonian specimen, recorded by Piroutet, 1 had been com- 

 pared. Lytoceras siemensi (Denckmann), 2 which maybe identical 

 with the Whitby form, has a similar whorl-section ; but, since the 

 New Zealand example, like the Phylloceras described above, has- 

 been crushed, at least at the smaller end, perhaps not much 

 importance can be attached to the compressed whorl-shape. More- 

 over, the Lower Liassic Fimbrilytoceras, for instance F. tuba (De 

 Stefani), 3 and the Middle Liassic Lytoceras sensu stricto, for 

 instance L. post-jimbriatum Prinz, 4 may show compressed whorls 

 similar to the Toarcian Thysanoceras of the cornucopia type. The 

 reticulate ornament is shown also in the true Fimbrilytoceras 

 fimbriatum (J. Sowerb} 7 ), 5 although here the ribs are not inclined 

 backwards as in the Toarcian form. 



Lytoceras francisci (Oppel) 6 = Ammonites fimbriatus Hauer 7 

 ex parte, differs from the example here described in having costation 

 with an anteriorly convex sinus on the periphery ; but there is no 

 resemblance to Lytoceras cereris (Meneghini) Bonarelli, 8 with 

 which form Rosenberg 9 included Hauer's example. Fimbrilyto- 

 ceras Jimbriatoides (Gremmellaro) 10 is distinguished from the 

 form here described by its circular cross-section. 



The details of the suture-line, with its extremely wide first 

 lateral and high external lobes, are not preserved ; but, although 

 the specimen is slightly worn, probably there were no plain ' flares ' 

 as in the true Lytoceras. 



Locality and horizon as above. 



(C) Upper Jurassic. 

 Genus Phylloceras Suess. 

 Phylloceras aff. meliterra^eum (Neumayr) auct. (PL XIV,. 

 fig. 1.) 



The large example illustrated in PI. XIV, fig. 1 (reduced to about 



1 ' Note Preliminaire sur la Geologie d'une Partie de la Ntravelle Cale- 

 donie ' Bull. Soc. Geol. France, ser. 4, vol. iii (1903) p. 155. 



2 ' Fauna des Oberen Lias von Dcernten ' Abhandl. K. Preuss. Geol. Landes- 

 Anst. toI. viii (1887) p. 156 & pi. i, fig. 8. 



3 ' Lias Inferiore ad Arieti, &c.' Atti Soc. Tosc. Sci. Nat. Mem. vol. viii 

 (1887) p. 62 & pi. i, figs. 17, 18. 



4 ' Fauna der iElteren Jurabildungen im Nordostlichen Bakony ' MitteiL 

 Jahrb. K. Ungar. Geol. Anst. vol. xv (1904) pp. 52-53 ( = Ammonites fim- 

 briatus A. d'Orbigny, pi. xcviii, non Sowerby). 



5 See S. S. Buckman, ' Yorkshire Type-Ammonites ' vol. ii (1919) pi. cxxxc, 

 fig. 2. 



6 ' Die Tithonische Etage ' Zeitschr. Deutsch. Geol. Gesellsch. vol. xvii 

 (1865) p. 551 ; non Lytoceras francisci Vacek, 'Oolithe von Cap San Vigilio ' 

 Abhandl. ILK. Geol. Reichsanst. vol. xii (1886) p. 4 (60) & pi. ii, figs. 1-2. 



7 ' Cephalopoden aus dem Lias der Nordostlichen Alp en ' 1866, p. 62 & 

 pi. xxii, figs. 1-2 only. 



8 ' Le Ammoniti del Rosso Ammonitico, &c.' Bull. Soc. Malac. Ital. vol. xix 

 (1894) p. 216 (—Ammonites cereris Meneghini, in Stoppani, ' Pal. Lombarde ' 

 [4] 1867, pi. xxi, fig. 3 only). 



9 ' Liasische Cephalopoden-Fauna der Kratz-Alpe im Hagengebirge ' Beitiv 

 Pal. Geol. (Esterr.-Ung. vol. xxii (1909) p. 241. 



10 Op. cit. (1884) p. 13 & pi. iii, figs. 20-23. 



