350 On Eozoin Canadense. 
the base of the Eozodn. The gradual passage from the wile 
chambers and thick septa to the narrower and thinner ones, aid 
finally to the irregularly aggregated mode of growth, designated 
by Dr. Carpenter as acervuline, is well seen. The white patclies 
in the upper portion of the figure do not arise from any impcr- 
fection in the electrotype, but represent the irregular growth of 
this part of the calcareous skeleton.” ; 
Slices of the fossils having been prepared for microscopic ex- 
amination, and submitted to Dr. Dawson, were at once recog- 
nized by him as presenting the characters of Foraminiferal shells. 
After a careful examination of a large number of specimens he 
named and described the fossil as follows. 
““K0ZOGN CANADENSE; gen, et. spec. nov. : 
General form.—Massive, in large sessile patches or irregular 
cylinders, growing at the surface by the addition of successive 
mine. 
ble thickness, which are penetrated by septal orifices irregularly 
disposed. Thicker parts of the walls sth bitldles of fine branch- 
ing tubuli.” 
The grounds on which he inferred its foraminiferal character 
are thus stated by Dr. Dawson: eee 
“1. The serpentine and pyroxene which fill the cavities of the 
calcareous matter have no appearance of concretionary struc- 
ur 
. 
have filled spaces or chambers in a hard calcareous mass. This 
conclusion is further confirmed by the fact, to be refered to in 
moulded on the forms of the serpentine and augite, but his 
i Though the calcareous lamine have in places a erystal- 
line cleavage, their forms and structures have no relation to this. 
Their cells and canals are rounded, and have smooth walls, 
which are Oceasionally lined with films ety of carbonace- 
ous matter. Above all the minute tubuli are different <a 
anything likely ‘to occur in merely crystalline calespar. Aphis 
: CKS é importar ight be attached to extern 
appearances of corals, sponges, or other OF — 4 
ganisms, these delicate internal structures have a mi Be eid 
claim to attention. Nor is there any improbability in the pres 
sd 
