part 3] AMMONITES FROM NEW ZEALAND. 297 



the specimen here described, owing to the somewhat imperfect 

 state of preservation, the differences are not appreciable. In both 

 the New Zealand species the terminal leaflets of the saddles are 

 more elongated than those depicted in Neumayr's figs. 1 & 6 of 

 pi. xvii. 



PhyUoceras insulindce Bcehm l has less numerous and less 

 angular constrictions, and these are still straighter in the group 

 of Ph. calypso (A. d'Orbignjr), Ph. herriasense (Pictet), and 

 Ph. silesiacwm Zittel. 



P. Choffat 3 pointed out that Ph. polyolcum had no greater 

 stratigraphical importance than Ph. mediterraneum, and attention 

 has already been drawn 3 to the unusually extensive vertical range 

 of some of these species-groups of PhyUoceras. 



Locality. — Kohai Point. 



Horizon. — Upper Jurassic (? gigas zone). 



Lttoceras cf. eex Waagen. 



1873. ' Jurassic Fauna of Kutch : I — Cephalopoda ' Mem. Geol. Surv. 

 India, Pal. Indica, p. 36 & pi. viii, fig - . 1. 



A specimen of a Lytoceras of the group of L. liebigi (Oppel), 

 belonging to Prof. P. Marshall, about 170 mm. in diameter, but 

 somewhat distorted, on the earlier volutions shows fairly strong 

 lineation of the type of that of the inner whorls of L. rex, but has 

 close, alternately plain and fimbriate, costse on the outer whorl. 

 At a whorl-height of 73 mm. the thickness is about 59 mm., and 

 the section thus is oval, compressed, with a very slight dorsal 

 indentation, not quite identical with that given by Waagen in his 

 fig. 1 h. The suture-line is perhaps just a little less complex than 

 that of L. adeloldes as figured by Waagen (pi. viii, fig. 2), but of 

 the same type. 



The example now described is completely septate, and does not 

 show the distant fimbria? of the outer whorl of Waageivs gigantic 

 specimen, also the stage with close fimbriae, preceding the final 

 stage, is very short in the Indian form ; whereas, according to 

 Waagen, up to a diameter of 300 mm., the whorls of L. rex are 

 ' covered with fine, closely arranged, undulated ribs, all of equal 

 strength.' The specimen here described, consequently, cannot be 

 definitely identified with Waagen's species. 



The numerous specimens of Lytoceras in the British Museum 

 from Mombasa, East Africa, whence Dacque 4 recorded a Lyto- 

 ceras cf. rex, belong to more finely lineate species. 



Locality. — Totara Point, Kawhia Harbour. 



Horizon. — Upper Jurassic. 



I PalEeontographica, Suppl. iv, pt. 3 (1907) p. 83 & pi. xvii, fig. 2. 



II ' Faune Jurassique du Portugal : I — Ammonites du Lusitanien ' Comm. 

 Trab. Geol. Portugal, 1893, p. 12. 



:! 'Jurassic Ammonites from East Africa, &c.' Geol. Mag. vol. lvii (1920) 

 p. 320. 



4 ' Dogger & Malm aus Ostafrika ' Beitr. Pal. Geol. OEsterr.- Ung. vol. xxxiii 

 (1910) p. 9. 



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