300 dr. l. r. spatii 0^ [vol lxxix, 



species, also to the Perispliinctes sp. (stenocycli) of the same 

 author. 1 The lateral lobe, however, is deeper and wider in the 

 New Zealand form, and the rib-curve is different. Despite the 

 similarity of the fragment here described to European Kimme- 

 ridgian Ataxioceratids, its affinities, as of A. brownei, are probably 

 with the Tithonian Perisphinctids of the Spiti Shales and their 

 equivalents in the Malaj r Archipelago and New Guinea. Aulaco- 

 sphinctoides cliidamensis and A. sparsicosta (Uhlig) 2 are, perhaps, 

 closest among the Spiti forms. They differ in whorl-section, and 

 the latter also in its shorter lateral lobe. The genotype oiAulaco- 

 spltinctoides, A. in^'undibvlus (Uhlig), with regularly bifurcating 

 ribs on the outer whorl, like the fragmentary specimen referred 

 above to A. brownei, shows less resemblance to the example here 

 described than do some forms of Virgatospliinctes. 



Perispliinctes ( Procerites) matsusliimai Yokoyama, 3 on the 

 outer whorl, shows ornamentation similar to that of the fragment 

 now described, but, like the other Japanese forms of Perispliinctes, 

 figured by the same author, is not identifiable from the figure. 

 Perispliinctes durangensis Burckhardt, 4 with which the Japanese 

 species has been compared, differs from the fragment here described 

 in being less involute, and in having quite a different t} T pe of 

 eostation. 



Apart from the trif urcation of some of the ribs on the outer 

 whorl-portion of our example, there is considerable resemblance to 

 some Kachh species of the group of Perispliinctes bleiclieri 

 Waagen non P. de Loriol, P. eudicliotovms Waagen non Zittel, 

 and P. occultefurcatus Waagen, all from the Umia Beds (see, for 

 instance, B.M. 499, 486, Blake Coll.), but believed by me 5 to 

 belong to the Kimmeridgian Torquatisphinctes, not the Tithonian 

 Aulacospliinctoides. Unless the outer whorls are preserved, how- 

 ever, even generic distinction is extremely difficult. 



Locality. — Te Puti Point, Kawhia Harbour. 



Horizon. — Tithonian (?). 



(3) Conclusions. 



The Lower Hettangian age of the forms here recorded as 

 Psiloceras (Enpliyllites ?) sp. nov. ind., Ps. (En.) sp. indet., 

 and Psiloceras. sp. cf. calcimontanum (Wsehner) is undoubted, 

 and they suggest deposits probably belonging to the megastoma 

 subzone : that is, the upper part of the planorbis zone in the 

 wider sense. 



The three species PhyUoceras aff. partsclii (Stur MS.) Hauer 

 sp., Pliacoplryllites aff. diopsis (Gfemmellaro), and Tlrysanoceras 



1 Ibid. p. 51 & pi. xix, fig. 3. 



2 Op. cit. (1910) pi. lxxiv, figs. 1 & 2. 



3 ' Jurassic Ammonites from Echizen & Nagato ' Journ. Coll. Sci. Impel'. 

 XJniv. Tokyo, vol. xix, Art. 20 (1904) p. 3 & pi. i, fig. 1. 



4 ' Faune Jurassique & Cretacee de San Pedro del Gallo ' Bol. Inst. Geo], 

 Mexico, No. 29 (1912) p. 16 & pi. iii, fig. 1. 



5 L. F. Spath, op. cit. Pal. Indica, 1923. 



