PLATE XXXIII 
Fig. 1. Clarkoceras holtedahli Sp. nov. Cross-section of specimen, Figure 2 
on Plate 27, from Bache peninsula. 
Fig. 2. Eremoceras syphax (Billings). Cross-section of specimen, Figure 8 
on this plate, from Point Levis, Quebec. 
Fig. 3. Ellesmeroceras scheii Gen. et Sp. nov. Cross-section of specimen, 
Figure 3 on Plate 27, from Bache peninsula. 
Fig. 4. Protocycloceras whitfieldi Ruedemann. Vertical section of a specimen 
from Fort Cassin, Vermont. 
Fig. 5. Protocycloceras cf. lamarcki (Billings). A, cross-section; B, vertical 
section; both sections based on specimen. Figure 5 on Plate 27, from Bear Island, 
but restored in part. 
Fig. 6. Deltoceras (?) sp. A, chiefly a longitudinal section through the center 
of the siphuncle, parallel to the dorso-ventral diameter. B, an attempted resto- 
ration, based on the preceding. C, cross-section, showing the siphuncle. Same 
specimen as Figure 6 on Plate 27. From Bear Island. 
Fig. 7. Protocycloceras lamarcki (Billings). A, specimen No. 550a of the type 
series, showing sutures of the septa. B, specimen No. 550b of the type series, 
showing the upper surface of a septum, with part of margin of siphuncle distorted 
by crushing. C, specimen No. 550c of the type series, showing sutures of the 
septa only near the base of the specimen. D, vertical section through the com- 
posite specimen 508 and 508a, showing the siphuncle. A, B, C, from Huntingdon 
county, Quebec. D, from Romaine on the Gulf of St. Lawrence. Of Canadian 
age. All specimens in the Victoria Memorial Museum, at Ottawa, Canada. 
Fig. 8. Eremoceras syphax (Billings). A, ventral view, showing the large 
siphuncle. B, lateral view, with siphuncle on left. C, dorsal view, with pseudo- 
siphuncle made by tool-marks of the original cleaner of the specimen, formerly 
misinterpreted as the siphuncle. From Point Levis, Quebec, in strata of Canadian 
age. Type, numbered 819 in the Victoria Memorial Museum, at Ottawa, Canada. 
Fig. 9. Eurystomites (?) boreale (Foord). A, lateral view of type specimen. 
B, incorrect cross-section, secured from cast of type at point B in Figure 9A. 
C, cross-section prepared from the original specimen, probably along the crack 
crossing the center of the type diagonally, as in Figure 9A; part of a figure drawn 
by Dr. F. A. Bather from the original specimen. From the Wellington Channel, 
in Arctic America, collected by Captain Inglefield. No. 96955 in the British 
Museum of Natural History, in London. 
