Dr. W. B. Carpenter on Eozoon canadense. 457 



lets are in-egularly piled one on the other (see p. 281, fig. 1) ; 

 and the parallelism of the tubuli to the walls of the chamber- 

 lets thej- adjoin, simply arises from the fact that thej are 

 passing-by these, in that perpendicular course from the cham- 

 herlets in which they originate^ toicards the external surface^ 

 which Mr. Carter himself recognizes as perfectly normal. 

 This is shown in the subjoined figm-e (a) traced from a trans- 

 parent section in my possession — the p)recise counterpart to 

 it [b) being shown in those Numraulites which have the " alar 



Fi-. 1. 



Parallel tubulation in acervuline 

 portion of Eozoon canadense, 

 showing tlie course of the tu- 

 buli between the irregularly- 

 piled chamberlets. 



Parallel tubulation of Nummulites 

 Icevif/ata, showing the course of 

 the tubuli between the alar pro- 

 longations of successive whorls. 

 After D'Archiac and Haiine. 



prolongations " of successive whorls prolonged over those 

 which preceded them, so as to be piled one upon another, often 

 dividing themselves into irregular chamberlets. For when 

 these are laid open by vertical section, it continually happens 

 that tlie tubuli coming off vertically from the chambers of an 

 inferior plane, lie parallel to the sides of the chambers of the 

 plane above them ; so that, if the chambers and tubuli were 

 infilti'ated with serj^entinc, and the calcareous skeleton were 

 removed by acid, the appearance presented would be exactly 

 that figured by Messrs. King and Rowney, which Mr. Carter, 

 with all the weight of his authority, pronounces to be " utterly 

 incompatible with Foraminifcral structure." — That I have not 

 evolved this parallelism out of my own consciousness, will be 

 manifest to any one wlio may take the trouble to refer to the 

 admirable plates of Nummuline structure given by MM. 

 D'Archiac and Ilaime in their ' Animaux Fossiles du Groupe 

 Nummulitique de I'lnde.' For it is distinctly seen in every 

 one of their thin vertical sections of those species in which 

 the " alar prolongations " are conspicuous — as N. intermedia, 

 Ann. <Ss Mag. N. Hist. Ser. 4. Vol. xiii. 33 



