part 3] AMMONITES FROM NEW ZEALAND. 299 



the complete ammonite illustrated in rig. "la, or to a closely similar 

 form. The large example has a diameter of 81 mm. and a whorl- 

 thickness of close on 35 per cent, of the diameter. There are 

 ahout four constrictions per whorl. The final constriction probably 

 formed the mouth-border, and is three-quarters of a whorl away 

 from the last septum. The suture-line is j^oorly preserved, but 

 comparatively simple, as ttgured by Budim. 



Mr. Buckman labelled this example ' Perisphinctes cf . pagri 

 Waagen '. A specimen of this form in the Blake Collection 

 (B.M. No. 543), from the Argovian Kantcote Sandstone, shows 

 similarity to the New Zealand species, and Perisphinctes sub- 

 evolutus Waagen (for instance, No. 539), from the Dhosa Oolite, 

 also seems to be close. In these two early species, however, the 

 inclination of the secondary ribs and the constrictions are different. 

 Perisphinctes bnrui Boehm 1 probably belongs to this Argovian 

 group of Perisphinctes, and is thus not related to the somewhat 

 similar New Zealand species of Aulacosphinctoid.es. 



On the other hand, Aulacosphinctoides hundesianus (Uhlig) 

 and A. chidamensis (Uhlig), if we may judge by examples in the 

 British Museum (31107 & C 7676a), are closer to the present 

 species, and one example of the same group of Aulacosphinctoides 

 (33539) from the Spiti Shales might almost be identified with 

 A. broivnei. 



A. uhligi, nom. nov . = Aidacosphinctes torquatus Uhlig non 

 Sowerby 2 (B.M. No. C 5034) is slightly less densely costate ; 

 A. incertus (Uhlig) (B.M. C 76766) and A. serpentinus (Uhlig) 

 (36933) are less closely comparable. 



A. marshalli, nom. nov.= Perisphinctes sp. in Boehm 3 has 

 slightly different costation, as I judge from an example lately sent 

 by the Geological Survey of New Zealand. 



A. sisyphi (Hector) 4 may represent a very large example of the 

 group to which A. broivnei and A. marshalli belong. 



Locality. — Te Puti Point, Kawhia. 



Horizon. — Tithonian (?). 



Aulacosphinctoides sp. indet. (PL XVII, figs. 3a & 3b.) 



This specimen consists of portions of two whorls, showing 

 somewhat corroded suture-lines. Height and thickness of the 

 outer volution amount to 28 mm., and there is an indistinct 

 constriction on this whorl. 



Mr. Buckman labelled this example 'Perisphinctes cf. uni- 

 compti/s Choffat, xviii, 3,' and there is, indeed, great resemblance 

 to the form figured by Choffat 5 and referred to Fontannes's 



1 ' Gcologische Mitteilungen aus clem Indo-Australischen Arcliipel: VI c — 

 Jura von Eotti, Timor, Babar & Burn ' Neues Jahrb. Beilage-Band xxv (1908) 

 p. 334 & pi. xiii. fig. 2. 



2 Oj>. cit. (1910) p. 368 & pi. lxxi. figs. 1 «-l d. 



:| Op. cit. (1911) p. 19 & pi. i, fig. 3, text-figs. 3 «-3 b. 

 * Op. cit. (1886) p. 68 & text-fig. 33, I. 



3 ' Faune Jurassique cm Portugal: Cephalopodes, I — Ammonites du Lusi- 

 tanien ' Comm. Trab. Geol. Portugal (1893) p. 46 & pi. xviii, figs. 3-5. 



