On Specimens of Eozoon Canadense. 217 
Fig. 11. Hozoon Cunadense. (1) Small specimen disengaged by weathering. 
(2) Acervuline cells of upper part—magnified. (3) Tuberculated surface of 
lamina—mag. (4) Laminz of Serpentine in section, representing casts of the 
sarcode—mag. 
obtained by Mr, E. H. Hamilton, who collected for me at 
that place; and these, on comparison with several less per- 
fect specimens in our collections, have established the fact 
that the normal shape of young and isolated specimens of 
Lozoin Canadense is a broadly-turbinate, funnel-shaped, or 
top-shaped form, sometimes with a depression on the upper 
surface giving it the appearance of the ordinary cup- 
shaped Mediterranean sponges. (Fig. 11.) These speci- 
mens also show that there is no theca or outer coat either 
above or below, and that the lamins pass outwards with- 
out change to the margin of the form, where, however, they 
tend to coalesce by subdividing and bending together. The 
laminw are thickest at the base of the inverted cone, and 
become thinner and closer on ascending, and at the top they 
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