182 DR. C. T. TRECHMA^X OlS [vol. Ixxiii^ 



fossils of the Otapiri Series, and this attribution is confiimed by 

 Diener on the strength of a specimen which Prof. Marshall sent 

 to Boehm. Several specimens of this shell that I collected contirm 

 Diener's observations on the external ornamentation, which consists- 

 of longitudinal lines crossed b}'' fine transverse lines. The sutures 

 show a ver}" shallow ventral lobe and similar, but rather deeper, 

 lateral lobes, and a small, well-marked, annular lobe. The siphuncle 

 in a specimen of three whorls occurs about midway between the 

 centre and the ventral margin. 



Locality and horizon. — Bed c, Otomita, Hokonui Hills; 

 Nugget Point, and other localities. Carnic. 



CLTDONArTiLrs (Peoclydoxal'tilus) cf. SPIEOLOBUS Dittmar. 

 (PI. XVII, fig. 3.) 



1902. E. von Mojsisovics, ' Ceplialopodeii der Hallstiitter Kallce ' vol. i, Suppltm^ 



p. 211 & pi. X, tiff. 3, pi. xi, tiff. 1. 

 1910. G. Jiuehm, Centralblatt f. Min. &c. p. 634. 



A Nautilid with angular sutures was sent b}^ Prof. Marshall to 

 Boehm, and handed on to Diener, who identified it as near the 

 above species. In specimens that I collected the lobes are angular 

 and the saddles rounded, strongly recalling those of a nearlv-allied 

 species Pr. goniatifes Hauer. The siphuncle of a specimen of 

 three whorls is dorsad of the centre. The surface of the shell 

 slopes more towards the venter, and is less rounded than in either 

 Fr. spirolohiis or Pr. goniatites ; while the venter itself is narrow 

 and gently rounded. 



Locality and horizon. — It is common in Bed c, Otamita 

 (Hokonui Hills), and occurs also at Nugget Point and other 

 localities. 



Aecestes sp. 



1909. Arcestes Jiolomii P. Marshall, Trans. N.Z. Inst. vol. xli, p. 144. 



1910. G. BtjL'lun, Centialblatt f. I\lin. &c. p. 634. 



Arcestids are fairly common in the Carnic beds, especially in. 

 Bed c at Otamita. Prof. Marshall sent a specimen from this 

 locality to Boehm, who submitted it to Diener. As the living 

 chamber was missing, he could not say whether it was Arcestes or 

 Proarcestes, and considered it better not to give any specific name. 

 No specimen that I saw or found had the living chamber, and so I 

 cannot add an^^thing to Diener's observations. If more complete 

 specimens could be obtained, it would probably be found that several 

 species of Arcestes are present in the New Zealand Trias. 



Arcestes cf. rh.t^ticus W. B. Clark. (PL XYII, fig. 1.) 



1883. Am. Journ. Sci. ser. 3, vol. xxxv, p. 119. 



1895. J. K. Ponipeckj, ' Ammoniten des Rhat ' Neues Jalirb. vol. ii, pt. 1, p. 3. 



Shell smooth, sides and venter rounded, umbilicus wide and 

 deep ; the umbilical shoulders are rounded, and slope towards the- 



