1915] PALAEOZOIC FOSSILS FROM HuDSON Bay. 85 
We 
SPECIES FROM THE DRIFT OF UNCERTAIN HORIZON. 
ZAPHRENTIS, sp. indet. 
A single specimen with the following characteristics: Corallum 
conical, almost straight with a slight curvature near the apex only, 
35 mm. long, rapidly expanding to a diameter of 33 mm. in the length 
given. Exterior marked with transverse lines of growth and distinct 
septal furrows. 
A vertical section shows septa and wavy, somewhat oblique but 
entire tabule in the lower third only. Assuming that no internal 
structures are lost, which is very doubtful, the calyx is remarkably deep 
with an oblique and almost straight floor.. This form is externally very 
like Petraia sp. described as No. 298 S. It is possible that the two 
specimens are identical, but the evidence of the internal structure, bad 
as it is, points to a dissimilarity. 
Locality—Drift, Mouth of Nelson river, District of Patricia, Ontario. 
Horizon—Doubtful. 
No. 299 S. Royal Ontario Museum of Palaeontology. 
CYATHOPHYLLUM, sp. indet. 
One fragment of a cylindrical and gently tapering corallite of about 
25 mm. in diameter; it is silicified and very imperfect, but reveals the 
typical structure of Cyathophyllum. 
At a diameter of 25 mm. 33 long primary septa extend almost to 
the centre of the corallite. Well developed septa of the second order 
alternate with the primaries and extend inwards two-thirds of the dis- 
tance to the centre. 
A peripheral zone, corresponding in thickness with the length of 
the secondary septa is filled with vesicular tissue, which appears in 
transverse sections as outwardly arched dissepiments. The central 
third of the corallite is closely tabulate. 
A distinct epitheca is present and shows strong annular rugosities 
or lines of growth. 
Locality—Drift, Mouth of Nelson river, Manitoba. 
Horizon—Doubtful. 
No. 290 S. Royal Ontario Museum of Palaeontology. 
