306 
AUG. F. FOERSTE 
Remarks. — Attached to the upper part of the specimen are 
a brachial valve of Camarotoechia litchfieldensis angustata 
Holtedahl and a pedicel valve of Spirifer vanuxemi prognostica 
Schuchert, the only two brachiopods known so far from this 
fragmental limestone horizon. Unknown species of Fistulipora 
and Fenestella complete our present knowledge of the fauna from 
this horizon, which is correlated by Holtedahl with the Keyser 
member of the Helderbergian. 
PLATE XXVII 
Fig. 1. Cf. Euconia quebecensis Billings. The more apical part of the specimen 
consists of a vertical section passing through the center of the umbilicus. At 
the base, parts of the two lower whorls are exposed along oblique surfaces. From 
Victoria Head on Bache Peninsula, Ellesmereland; in the Orthoceras limestone, 
regarded as of Canadian age. In the Paleaontologisk Museum, Kristiania; 
collected by Per Schei in 1899. Size 22/10. 
Fig. 2. Clarkoceras holtedahli Sp. nov. A, an obliquely lateral view; a rect- 
angular section has been cut out from the right half of the ventral side of the 
conch; one side of this section is parallel to the dorso-ventral diameter, the 
other side is at right angles to the first; the former exposes the siphuncle, and 
the second shows the strong lateral concave curvature of the septa. B, a strictly 
lateral view of the same specimen, with an attempt to indicate the probable 
dorsal and ventral outlines of the conch. Figure 1 on Plate 33 is a cross-section 
of this specimen, made at the seventh septum above its base. From Victoria 
Head on Bache Peninsula, Ellesmereland; in the Orthoceras limestone, regarded 
as of Canadian age. In the Palaeontologisk Museum, Kristiania; collected by 
Per Schei in 1899. 
Fig. 3. Ellesmeroceras scheii Gen. et Sp. Nov. A, ventral view, showing rise 
of sutures toward the siphuncle; size 22/10. B, the same view, but of natural 
size. C, lateral view, with siphuncle on extreme right of figure; along the left 
side of figure the sutures are not preserved. Figure 3 on Plate 33 is a cross- 
section of the conch taken at the top of the phragmacone, the position and size 
of the siphuncle being inferred from the actual exposure of this siphuncle at the 
base of the specimen. From Victoria Head, on Bache Peninsula, Ellesmereland; 
in the Orthoceras limestone, regarded as of Canadian age. In the Palaeontologisk 
Museum, Kristiania; collected by Per Schei in 1899. 
Fig. 4. Cf. Cameroceras tenuiseptum (Hall). A, lateral view, with septa not 
preserved on left side ; sutures of septa apparently form shallow lobes. B, another 
view, oriented so as to show the right side of figure 4A ; the irregularities in the 
course of the septa are due to irregular weathering of the surface of the specimen. 
C, basal view of same specimen, showing cross-section of specimen in its present 
condition, no definite knowledge regarding the siphuncle is presented. Generic 
reference uncertain. From Victoria Head, on Bache Peninsula, Ellesmereland; 
in the Orthoceras limestone, regarded as of Canadian age. In the Palaeontologisk 
Museum; Kristania; collected by Per Schei in 1899. 
