22 
end. Behind the lip there is in succession a slight elevation, a well-defined 
furrow, a low ridge, and a scarcely defined depression. The living cham- 
ber is about three-fourths of a whorl. The primary ribs are short, rather 
broad, low, rounded, slightly inclined, and number 17 on the outer whorl. 
The secondary ribs are straight across the venter, two bifurcate from each 
primary, and in addition there is one intercalated secondary to each 
primary. The suture line is little cut. ES and Si are both deep and about 
equal, Si being a little narrower than ES. S2 is small. LI is shorter than 
EL, has a long, narrow median lobule and a short, narrow lobule on either 
side; it is nearly as broad as SI. L2 is broad. 
The species name is given for Professor J. A. Allan. 
Horizon and Locality. At the base of the Fernie formation on the 
headwaters of Sheep creek, Alberta. 
Type. National Museum of Canada, Ottawa; holotype, Cat. No. 9021. 
Diameter. ....... 
Height, whorl. . . 
Thickness, whorl 
Width, umbilicus 
Saxitoniceras marshalli n. sp. 
Plate VIII, figures 3, 4 
Mm. 
Mm. 
49-2 
42 
43 
48-8 
77 
22-3 
14-2 
The specimen is a little distorted and is imperfect. The maximum 
diameter cannot be measured owing to imperfection of the anterior end. 
The first measurement is taken about one-eighth of a whorl back from 
the anterior end and the second one-half whorl back. The inner whorls 
are sphaeroconic and there is umbilical enlargement on about the anterior 
half of the outer whorl. The whorls are depressed, being much thicker 
than high. A very narrow inner part of the lateral area is somewhat 
flattened; the ventral area is broad and well arched. Not enough of the 
mouth border is preserved to describe. The primary ribs are little inclined, 
are of moderate thickness, and have considerable relief, but at the anterior 
end of the outer whorl are broad, low, and rounded. The secondary ribs 
are about three to each primary, are very little inclined on the sides, but 
are straight across the venter. 
The suture line is rather simple, SI is somewhat smaller than ES. 
LI appears to be a little stronger than EL. L2 is broad. 
Compared with Saxitoniceras allani n. sp. this species is a little 
larger, has much thicker whorls, and differs in details of the suture line. 
Stephanoceras zirkeli Steinmann 1 from Caracoles, Chile, has a larger um- 
bilicus, compared with that of the inner whorls of S. marshalli, has narrower 
and more elevated primary ribs, and shows no umbilical enlargement. 
The suture line is not illustrated and no comparison can be made with it. 
It is probably not of the same genus as S. marshalli. 
The species name is given for J. R. Marshall. 
Horizon and Locality. At the base of the Fernie formation on the 
headwaters of Sheep creek, Alberta. 
Type. National Museum of Canada, Ottawa; holotype, Cat. No. 9022. 
iNeues Jahr. Min. Geol. Pal., Beil.-band, I, p. 269, PI. 12, figs. 5, 5a. 
