268 
AUG. F. FOERSTE 
Holtedahl, in his paper on ^^The Cambro-Ordovician Beds of 
Bache Peninsula/’ figures fossils from three horizons. From 
the sandstones at Cape Camperdown, at the southeastern corner 
of Bache peninsula, he figures a cranidium, a free cheek, and a 
pygidium of Ptychoparia. From an overlying light greyish- 
white limestone which crops out midway up the vertical face of 
Victoria Head he figures a cranidium of Illaenurus and one of 
Ptychoparia. From an overlying close-grained brown limestone 
farther up the Head he figures a pygidium of Bathyuriscus, a 
Maclurea, and a Hormotoma. The Clarkoceras and Ellesmero- 
ceras here described were obtained somewhere within the greyish- 
white limestone mentioned above. Since the total thickness of 
the latter was estimated by Per Schei at 350 feet, it is possible 
that more than one horizon here is included. The Illaenurus 
and Ptychoparia figured by Holtedahl suggest the Ozarkian age 
of the including strata, while the cephalopods here discussed 
suggest Canadian age. It is possible that both horizons are 
present in the greyish- white limestone at Victoria Head. 
5. Protocycloceras lamarcki (Billings). 
Plate XXXIII, figs. 7 A, B, C, D 
Orthoceras lamarcki Billings, Canadian Nat. Geol., 4, 1859, 
p. 362; Geol. Canada, Geol. Surv. Canada, 1863, p. 121, figs. 
38 a, b, c; Pal. Foss. 1, Geol. Surv. Canada, 1865, pp. 255, 347, 
fig. 336. 
Protocycloceras lamarcki Hyatt, Zittel-Eastman Textb. Pah 
1, 1900, p. 518; Ruedemann, Bull. New York State Mus., 90, 
1906, p. 441, pi. 15, figs.1-6; pi. 16, figs. 1, 2; figs. 15, 16. 
Types. — The first published figure consists of three views of a 
specimen numbered 550 in the collections of the Geological 
Survey of Canada, and labelled as coming from lot 12, concession 
12, Godmanchester township, in Huntingdon county, Quebec. 
This specimen is 36 mm. long and has 12 annulations in a 
length of 33 mm. ; the diameter at its upper end is 17 mm. ; and 
its apical angle is about 8 degrees. In preparing the first pub- 
lished figure a mirror camera lucida was used so that in both 
