AECTIC ORDOVICIAN AND SILURIAN CEPHALOPODS 249 
Bache Peninsula and the Neighboring Regions of Ellesmere 
Land’’ in No. 28 of the Report on the Second Norwegian 
Arctic Expedition in the ^^Fram” 1898-1902. This expedition 
was led by Captain Otto Sverdrup; Per Schei was the geologist 
of the expedition. Bache Peninsula lies between 79° and 79°16' 
north latitude on the eastern coast of Ellesmereland and extends 
as far eastward as 74° 30' west longitude. Cape Camperdown 
forms its southeastern corner and Victoria Head its northeastern 
corner. The lowest strata on the peninsula are exposed at 
Cape Camperdown. From this locality Dr. Holtedahl figured 
a cranidium, a free cheek, and a pygidium under the teriri Ptycho- 
paria sp. The strata at Cape Camperdown dip north-north- 
west and are overlaid stratigraphically by those at Victoria 
Head. 
From the Orthoceras limestone, ^‘a bed of light greyish- white 
limestone, about 350 ft. thick which cropped out midway 
up the vertical face of Cape Victoria Head,” Dr. Holtedahl 
figured a cranidium of another Ptychoparia and a cranidium of 
Illaenurus. In addition, sections of fossil fragments, especially 
of Orthoceratidae, are fairly common. Of these Orthoceratidae 
Dr. Holtedahl kindly loaned me a number of specimens. At 
first sight these appeared to be very unpromising material, 
consisting chiefly of fragments of conchs exposing oblique cross- 
sections of their interiors. In most cases not even enough of 
the conch is present even for generic determination. However, 
in several cases, by grinding away the matrix, enough of single 
conchs was revealed to admit of fairly detailed study. Two of 
these specimens are figured and described here under the terms 
Clarkoceras holtedahli and Ellesmeroceras scheii; the first is named 
in honor of Dr. Holtedahl, to whose paleontological studies we 
are indebted greatly in our knowledge of Arctic faunas, and the 
second is named in honor of Per Schei whose zeal in collect- 
ing made some of these paleontological studies posssible and 
whose untimely death we mourn. The second species belongs 
to the Endoceratidae, but is regarded as differing sufficiently from 
typical Endoceras to warrant a distinct generic name. It has 
its nearest relatives among Endoceratidae of Canadian age. 
