21 
As less than one-half of a side of the specimen is preserved, the above 
measurements are very approximate. The entire specimen is septate and 
no living chamber is preserved. The complete specimen must have been 
larger than any of the other species referred to Zemistephanus. Cadiconic. 
There is no whorl contraction or umbilical enlargement. It is placed in 
Zemistephanus because of its similarity in ornament and its similarity in 
cone shape to the inner whorls of the other species of this genus. The 
walls of the umbilicus are steep and the ventral area is highly arched. 
The primary ribs, of rather low relief, end in large conical tubercles. The 
secondary ribs are rather small, of moderate relief, and are arched forward; 
about three of them branch from each tubercle and in addition there are 
two intercalated secondary ribs per tubercle. The preparation of the 
suture line is not satisfactory. 
Compared with Z. richardsoni and Z. funteri, this species is larger, has 
more highly arched whorls, somewhat fewer tubercles per whorl, and the 
secondary ribs are more strongly arched forward on the ventral area. 
Compared with Teloceras hanksii (J. Sowerby) 1 , the whorls are not so 
thick, are more highly arched on the venter, and the size is probably smaller. 
The species name is given for Captain Vancouver. 
Horizon and Locality. From the lower Yakoun beds on the northeast 
side of Mackenzie bay, northwest shore of Maude island. 
Type. National Museum of Canada, Ottawa; holotype, Cat. No. 
9008. 
Genus, Kanastephanus McLearn 
( Kana , Skidegate channel) 
1927. Kanastephanus McLearn, Trans. Roy. Soc., Canada, 3rd ser., 
vol. 21, sec. IV, p. 73. 
At stage of growth of inner whorls, cadiconic. At stage of penultimate 
whorl, cadiconic, with slightly contracting umbilicus, but whorl becoming 
relatively a little higher and, therefore, somewhat less depressed, as in 
K. altus. At stage of ultimate whorl there is umbilical enlargement and 
rounding and contracting of whorl, chiefly in thickness, i.e., a falling off 
to serpenticone. At all stages, however, whorls are thicker than high. 
The living chamber is nearly three-fourths of a whorl. There are lateral 
lappets. With the falling off to serpenticone at the stage of the ultimate 
whorl, there is also some simplification in ribbing. The primary ribs, 
however, increase in number, not only on the inner whorls, but also on 
the ultimate whorl where there is the greatest number per whorl. The 
simplification on the ultimate whorl is the decrease in number of secondary 
ribs, due to decrease in number of secondaries per each primary, and is 
carried to the stage of two per each primary, arising by bifurcation. The 
ribs are of considerable relief and in some species are slightly inclined on 
the sides, particularly near the anterior end, but in all are straight across 
the venter. There is a single row of lateral tubercles. Suture line fairly 
simple. LI is rather broad stemmed, tripartite, with moderately long 
median lobule, and is about as long as EL. The small L2 is both narrow 
and short. The small aux.l is inclined and the miniute aux.2 is a little 
inclined. ES is much broader and deeper than SI and is unequally 
1 See Buckman, S. S.: Type Ammonites, VI, pt. 59, Pis. 660 A, B (1926). 
