20 
The suture line of one side of this specimen has been prepared. It is 
moderately complex. The ES is broad, deeper than broad, and deeply 
divided by a long, narrow lobule; SI is much smaller, but is of about the 
same proportions as ES; S2 is broad, but very shallow; LI is somewhat 
longer than EL, has a long, slender, median lobule, and long, slender lobules 
on each side; L2 is short, narrow, simple, and cruciform, a little inclined, 
and has a long, narrow, median lobule; auxiliaries are narrow and aslant. 
The tubercle is about on the border between L2 and S2. 
Horizon and Locality. The holotype was collected by J. Richardson 
in 1872 from Skidegate channel and is probably from the lower Yakoun 
formation at Mackenzie bay. The plesiotype is from the lowest and 
fossiliferous beds of the Yakoun formation on the northeast shore of 
Mackenzie bay, northwest shore of Maude island. 
Types. National Museum of Canada, Ottawa; holotype, Cat. No. 
5013; plesiotype, Cat. No. 9006. 
Zemistephanas funteri n. sp. 
Plate X, figure 1 
Diameter 
102-0 
95-5 
78-0 
65-0 
Height, whorl 
23-1 
26-2 
32-4 
36-0 
Thickness, whorl 
Width, umbilicus 
52-8 
43-5 
41-0 
39-4 
Tubercles per whorl 
16 
As only one part of one side is preserved, the above measurements 
are only approximate. The shell form, proportions, and size, as far as 
they can be determined, are somewhat similar to those of Ze?nistephanus 
richardsoni (Whiteaves). The umbilical expansion begins at about the 
same stage of growth as that of the holotype of that species, i.e., at a 
diameter of about 80 mm. The umbilical expansion, however, is more 
abrupt than in Z. richardsoni. Nearly three-fourths of a whorl of living 
chamber is preserved. The primary ribs have low relief and end in large 
conical tubercles. The secondary ribs on the penultimate whorl are small 
and about 8 in number between tubercles. On the ultimate whorl they 
are fewer and larger. The suture line is much as in Z. richardsoni ; Ll is 
long and cruciform with a long, narrow, median lobule and a fairly long 
lobule on either side; it is slightly asymmetric, the median lobule being a 
little towards the inner side; L2 is small, similar to that of Z. richardsoni , 
but a little shorter; the auxiliaries are small and inclined; SI is smaller 
than ES, and S2 is broad and shallow. The tubercle is about on the 
border between L2 and S2. 
The species name is given for Robert Funter. 
Horizon and Locality. From the lower Yakoun on the northeast side 
of Mackenzie bay, northwest shore of Maude island. 
Type. National Museum of Canada, Ottawa; holotype, Cat. No. 
9007. 
Zemistephanus vancouveri n. sp. 
Plate XI, figures 1, 2 
Diameter 101-6 
Height, whorl 42-3 
Thickness, whorl 70-0 
Width, umbilicus. 40-0 
