218 Canadian Record of Science. 
become confounded in a general vesicular or acervuline 
layer. I feel now convinced that broken fragments of this 
upper surface scattered over the sea-bottom formed those 
layers of Archwospherine which at one time I regarded as 
distinct organisms. 
It is to be observed, however, that other forms of Eozoon 
occur. More especially there are rounded or dome-shaped 
masses, that seem to have grown on ridges or protuber- 
ances, now usually represented by nuclei of pyroxene. 
(2.) Osculiform tubes. 
In the large number of specimens of Hozoén which have 
been cut or sliced in various directions, and are now in our 
museum at Montreal, it has become apparent that there are 
more or less cylindrical depressions or tubes, sometimes 
filled with serpentine and sometimes with inorganic calcite, 
crossing the lamine at right angles. These seem to occur 
chiefly in the large and confluent masses, and are without 
any regular or definite arrangement. In some of the nar- 
rower openings of this kind the lamine can be observed to 
subdivide and become confluent on the sides of these tubes, 
in the same manner as at the external surface. This cir- 
cumstance induces me to believe that these are not acci- 
dental, but original parts of the structure, and intended to 
admit water into the lower parts of the masses. (See Fron- 
tispiece.) A central canal of a similar kind is well shown 
in the accompanying illustration. 
