E0Z00N CANADEXSE AT COTE ST. PIEEEE. id 



Stromatoporoid masses, projecting from the weathered beds of lime- 

 stone, would at once attract the attention of any collector ; and the 

 whole conditions of its occurrence, whether entire or in fragments, 

 are precisely those of fossil corals in the Silurian limestones. Fur- 

 ther, the symmetry and uniformity of its habit of growth are much 

 more apparent when they can be studied in large specimens prepared 

 by natural weathering or by treatment with an acid. 



[Note (Oct. 30). — Messrs. Eichardson and Weston, of the Geolo- 

 gical Survey, have recently revisited the locality of Eozoon at Cote 

 St. Pierre mentioned in the above paper, and have collected some 

 additional specimens. One of these deserves notice, as illustrating 

 the nature of Arcliceosplicerince. It is a small or young small speci- 



Figs. 1- 



4. — Small iveatliered Specimen of Eozoon from Petite 

 Nation. 



Fig. 1. Natural size; showing general form, and acervuline portion above and 

 laminated portion below. 



2. Enlarged casts of cells from upper part. 



3. Enlarged casts of cells from the lower part of the acervuline portion. 



4. Casts of sarcode layers from the laminated part ; enlarged. 



men, of a flattened oval form, 2| inches in its greatest diameter, and 

 of no great thickness (fig. 1). It is a perfect cast in serpentine, and 

 completely weathered out of the matrix, except a small portion of 

 the upper surface, which was covered with limestone which I have 

 carefully removed with a dilute acid. The serpentinous casts of the 



