66 



ME. A, W. WATERS ON TERTIARY CHTLOSTOjUATOTTS 



seeing that while certain important characters show that they are 

 closely allied, in other points there are differences which may he 

 varietal. The oral aperture of the New-Zealand fossil has a 

 narrow sinus and is 0*2 millim. wide, which is larger than in 

 the Australian fossils, but not so large as in the recent examples, 

 in which it is 0 # 32 millim. wide and has a much larger and rounder 

 sinus. 



In both the recent specimens and the New-Zealand fossil the 

 ovicell is more concealed than in the fossil first described, and in 

 both there is a row of pores round the flat central part inside the 

 ridge. In fact, in one specimen from Napier the ovicell is quite on 

 a level with the zocecium, and only the ridge and row of pores is 

 visible. These pores are not mentioned by Mr. Hincks in his 

 description, but occur in a recent specimen from Port Western. In 

 the Napier fossil the avicularia are smaller and more raised than 

 in the others, and there is usually only one avicuiarium to a zocecium ; 

 the centre of the zocecium is plain with large pores round it, whereas 

 in the recent examples there is no plain portion, but there is in one 

 a ridge up the centre as first described. The ovicell of the New- 

 Zealand fossil is so much concealed that I am not sure whether there 

 have been radiating lines on its walls. 



The affinities and differences of these three varieties, separated as 

 they are in time and locality, are very interesting. 



Loc. Living : Port Phillip, Port Phillip Heads, and Port Western 

 (Adelaide). Fossil : Curdies Creek (S.W. Australia), Mount Gambier 

 (S. Australia), and Napier (New Zealand). 



68. Schizoporella OBLiQUA, (?) MacG. (Woodcut, fig. 2.) 



Escliara obliqua, MacGillivra} T , Austr. Polyz., Trans. Roy. Soc. Vict, 

 vol. ix. p. 137 (1868): Zool. Vict, decade v. p. 39, pi. xlviii. fig. 1. 



An adnate specimen, from Waipukurau Gorge, has zocecia sur- 



Pig. 2, 



■Schizoporella obliqua (?), MagG., from 

 WaijmJiurau, New Zealand. 



X25 



rounded by raised smooth lines, and also frequently a raised line 

 across, or partly across, the zocecium below the aperture, and there 



