198 J. W. Dawson— Mobius on Eozoon Canadense. 
mode of occurrence of the organism, or indeed of its general 
part made up of its remains. He objects strongly to the want 
of definiteness of form and distribution in the chambers and 
connecting passages, without making allowance for defects of 
preservation, or mentioning the similar want of defined form in 
some Stromatopore. Headmits, however, that the modern Car- 
teria and its allies are in some respects equally indefinite. 
He farther objects to the impossibility of detectimg regular 
primary chambers like those in modern foraminifera, but seems 
not to be aware that, as I have recently shown, some Stromato- 
pore originate in a vesicular, irregular mass of cells, and that 
in Lojtusia, both the Eocene L. Persica, and the Carboniferous 
L. Columbiana, the primary chamber is represented by a merely 
cancellated nucleus. 
That he does so is apparent from his stating that the proper 
wall structure sometimes crosses the bands of serpentine and cal- 
cite, and that it presents a series of parallel four-sided 
prisms, whereas, when at all perfectly preserved, it shows 4 
series of cylindrical threads penetrating a calcite wall. That 
some of his specimens have contained the proper wall fairly 
preserved is obvious from his own figures, in which it is poss 
ble to recognize both this structure and chrysotile veins, though 
confounded by him under the same designation. He objects, 
somewhat naively, that many of the chambers fail to exhibit 
* See Journal of London Geol. Soc., January, 1878. 
