20 
Family, Gowericeratidae S. Buckman 
Germs, Yakounites McLearn 
Yakounites mcevoyi n. sp. 
Plate IV, figures 1, 2 
Mm. 
Mm. 
Diameter 
95 
80 
Height, whorl 
35-6 
46-5 
Thickness, whorl, 
.... . . . . 41 
51-2 
Width, umbilicus. 
...... 25-8 
16-9 
The first measurement is taken at the anterior end of the outer whorl 
and the second about one-fourth whorl back. The posterior part of outer 
whorl is involute, anterior part shows marked umbilical enlargement; on 
outer whorl cone shape is from about sphaeroconic to almost scaphiticonic. 
Whorls are thicker than high, are somewhat flattened and convergent 
on the sides and rounded on the venter. There is whorl contraction at 
the anterior end. There is less than one-half whorl of living chamber. 
The venter of a part of the penultimate whorl is exposed and is rounded. 
The inner margin is narrow and upright and its outer edge abruptly 
rounded. The narrow, angular, primary ribs are curved a little, are slightly 
inclined, and number 29 on the outer whorl. The narrow and elevated 
secondary ribs number four to each primary on the posterior part of the 
outer whorl, and five to each primary on the anterior part. The suture 
line is deeply cut. ES 1 is about one-third deeper than wide and is divided 
on its inner side by a long accessory lobe. SI is smaller and is divided by 
a long accessory lobe. LI is longer than EL and has a long, median lobule 
and short, drooping lobules on either side. 
This is a much smaller species than Yakounites plenus McLearn or 
Yakounites loganianus (Whiteaves); it has relatively somewhat lower and 
thinner whorls, a more abrupt umbilical enlargement, and somewhat 
relatively longer lobes. 
The species name is given for James McEvoy. 
Horizon and Locality . Collected on Ribbon creek, Kananaskis river, 
by James McEvoy in 1908. Presumably from the Fernie formation. 
Type, National Museum of Canada, Ottawa; holotype, Cat. No. 5018. 
Family, Stepheoceratidae S. Buckman 
Genus, Stemmatoceras Mascke 
Stemmatoceras albertense n. sp. 
Plates Y-YII 
Mm. Mm, 
Diameter 145 116-5 
Height, whorl 2/-2 30-2 
Thickness, whorl 44-4 (43*1) 47-8* (47-2*) 
Width, umbilicus 51-7 48-8 
Primary ribs 38 33 
Secondary ribs 118 
* Approximate. 
1 In accordance with common practice, the following symbols are used to designate lobes and Baddies: ES, 
external saddle; SI, first lateral saddle: 82 , second lateral saddle; EL, external lobe; LI, first lateral lobe; L2, 
second lateral lobe; Aux. 1 , auxiliary lobe. 
