part 3] AMMONITES FROM NEW ZEALAND. 289' 



the Pluphyllites type : that is, intermediate between Phylloceras 

 and Psiloceras, and the comparison with Wcehneroceras (for 

 instance, the somewhat similar but more closely costate W. ? toxo- 

 phorum Wsehner sp. 1 with appreciably different suture-line) is 

 thus open to criticism. 



- Locality. — Junction of Taylor's Creek with the Otapiri, Hoko- 

 nui Hills. 



Horizon. — Lower Lias, Hettangian ; planorbis zone, s. L 

 {megastoma hemera). 



Psilocebas (Ettphyllites ?), sp. indet. (PI. XII, figs. 3, 4 a,. 

 &4S.) 



The dimensions of the largest example (fig. 3) labelled Wcehner- 

 oceras sp. by Mr. Buckman, are : 39, 30, ?, 41. 3 The periphery 

 is compressed, and the flexicostse are thickened on the inner half of 

 the side as in JEgoceras calcimontanum Wsehner. The specimen,, 

 however, is poorly preserved. 



A smaller example (fig. 4«) has the following dimensions: 25,. 

 40, 31, 34. The last half-whorl belongs to the body-chamber. I 

 succeeded in exposing the suture-line of this form, but the drawing 

 here reproduced is somewhat restored. It is not unlike that of 

 Psiloceras erugatum (Bean MS.) Phillips sp. as figured by me, 3 

 and agrees in general outline and phylloid saddles with the suture- 

 lines of Psiloceras of the meqastoma bed from the Pfonsjoch, in 

 the British Museum (for instance, ISTos. C 13866 & 69 : Psiloceras 

 loxoptychum Wsehner sp. ; C 13781 : P. sp. nov. cf. raliana 

 Wsehner sp.), but is still more phylloid than those of typical 

 species of Wcehneroceras. 



A small and fragmentary specimen (No. 5), not figured, pro- 

 bably belonging to the same form, shows well the fine striation 

 that forms the continuation of the bulging costae of the inner half 

 of the sides. This is exactly like the ornamentation of JSuphyl- 

 lites, but JEiipliyllites struckmanni (Neumayr) 4 has constricted 

 inner whorls. 



Locality and horizon as above. 



Psiloceras sp. cf. calcimontanum (Wsehner). (PI. XII, 

 figs. 2«&25.) 



1884. Mgoceras calcimontanum Waehner, ' Beitrage zur Kenntnis der 

 Tieferen Zonen des Unteren Lias in den Nordostlichen Alpen ' 

 Beitr. Pal. (Esterr.-TJng. vol. iii, p. 112 & pi. xxiv, fig. 1. 



Mr. Buckman compared this specimen, of dimensions : 40, 34, 

 33, 41, with ' JEgoceras megastoma Wsehner, V, 7' (-=2Egoceras 



1 Op. cit. pt. ii, vol. iii (1884) p. 18 & pi. xii, fig. 5. 



2 Diameter in mm. ; greatest whorl-height, thickness, and umbilicus in 

 percentages. 



:i ' The Development of Tragojihylloceras loscombi ' Q. J. G. S. vol. lxx (1914) 

 pi. 1, fig. 4. 



4 See Wffihner, op. cit. pt. viii (1898) p. 284 & pi. xxii, fig. 4 a. 



