144 



Tranffacfions. 



Rather frequent in the Hokonui Hills. This appears to be the orgarism 

 called in the Geological Survey reports '" Paleenautilus." 



Part of Sdtuke-line of Bi-oncoceras 

 mavdevillei. 



Part of Suture-line of 

 Avceiites hokunui. 



Arcestes hokonui, n. sp. 

 Diameter, 2| in. ; breadth, 



Uin. 



Deeply involute, not compressed. Surface smooth, except for distant 



lines of growth. 



Phylloceras kawhise, n. sp. 



Diameter, 5| in. ; breadth, 2 in. 



Deeply involute, somewhat compressed. Shell smooth, except for rather 

 distant lines of growth. No keel. 



iEgoceras brownei, n. sp. 



Diameter, 2 in. ; breadth, | in. 



Surface marked with transverse ridges, which bifurcate near the venter. 

 Form Anarcestes-\\ke. 



n: 





Suture-line of ^F.goceras hi'OKUci. 



SuTUEE-LiNE OF PhylloceraK kairhi(('. 



Orthoceras brownei, n. sp. 



Diameter, H in. ; length, not known. 



Septa ^ in. apart. Surface smooth. Siphuncle not seen. 



Orthoceras otapiriensis, Hector (?). 



Diameter, 3 in. ; length, not known. 



Septa I in. apart. Surface smooth. Siphuncle not seen. 



This organism appears to be identical with Hector's Belemnites otapiri- 

 ensis, which is described as in all cases of a phragmacone without any guard. 

 He records this form as abundant in the Hokonui Hills, the locality from 

 which this specimen came. 



It is remarkable that such genera as Broncoceras and Orthoceras should 

 be found in strata of such late periods. The former is associated with such 

 a curious assemblage of genera that it is extremely hard to suggest any 

 period to which they could all belong. Among these genera are Ostrcea, 



