23 
Canada 
Geological Survey 
Victoria Memorial Museum 
BULLETIN No. 1 
IV. — Notes on Cyclocystoides. 
By Percy E, Raymond. 
The recent discovery by the writer of a Cyclocystoides at so low 
a horizon as the lower part of the Lowville in Central Ontario, 
extends the known vertical range of this peculiar organism, and 
furnishes a text for a few observations upon the structure of the 
animal. It may be well first to review briefly the known occur- 
rences of species of this genus, beginning with the oldest. 
(1.) Beatricea beds of the lower Lowville, below the range of 
Tetradium cellulosum; 1 specimen, collected by the writer, on 
lot 25, con. VI, of Carden, Ontario, The specimen is about 15 
mm. in diameter and is badly preserved. It seems to have had 
30 plates in the sub-marginal ring. It is exposed from the upper 
side, but the plates of that side of the disk are entirely worn away, 
so that the plates of the opposite surface are exposed from the in- 
ner side. These plates are preserved in only a portion of the speci- 
men, and show a radial arrangement of small plates with large 
pores between them. On one of the sub-marginal plates, the 
outer, excavated portion is retained, and shows two depressions 
to the plate. Some of the more weathered plates seem to show 
two pores which penetrate the plate longitudinally and connect 
the outer cup-shaped depressions with the inside of the disk. 
(2.) Black River, Tetreauville, Que., near Ottawa. Mr. J.E. 
Narraway collected a slab showing the impressions of six rather 
small individuals. The specimens are too poor to furnish any 
information, but are important as indicating the presence of the 
genus in these strata. The Black River at Ottawa is believed 
to be of the age of the Leray in New York. 
24853 — 2\ 
