11 
species have more numerous primary ribs at the same stage of growth. 
The umbilicus is wide for Yakounoceras , but it is contracting with growth, 1 
the specimen is not fully gi-own, and in Yakounoceras , e.g. in Y. abruptum, 
there appears to be umbilical contraction before enlargement. 
The species name is given for Capt. Torrens. 
Horizon and Locality . In a sandstone bed in the upper part of the 
Yakoun formation on the northeast shore of Maude island, Skidegate 
inlet, Queen Charlotte islands. 
Type. National Museum of Canada, Ottawa; holotype, Cat. No. 
9004. 
Genus, Galilaeites S. Buckman 
Galilaeites ? penderi n. sp. 
Plate VIII, figures 1, 2 
Diameter 
Height, whorl 
Thickness, whorl. . . 
Width, umbilicus... 
37-5 
35-0 
31-5 
24-0 
36-5 
38-5 
38-5 
35-0 
43-7 
40-0 
43-0 
43-6 
40-0 
41-0 
44-9 
The first measurement is taken near the anterior and the last about 
one-eighth whorl in front of the posterior end of the ultimate whorl. The 
cone shape is that of a serpenticone with subtrigonal whorls thicker than 
high, broad, flattened, convergent sides outside the line of lateral tubercles, 
and narrow, somewhat flattened, divergent sides inside the tubercles. 
The venter is tabulate. Perlatumbilicate to latumbilicate, the umbilicus 
contracting with growth. The inner margin is narrow and its edge 
abruptly rounded. There are about 22 inclined, narrow, elevated, primary 
ribs, each ending in a tubercle, and about 70 elevated, narrower, secondary 
ribs, arising by trifurcation at the tubercle and also by occasional inter- 
calation. They are inclined slightly on the sides, bent back in some 
places, straight across the tabulate venter, and thickened transversely and 
elevated on the margins of the tabulate area. There is less than half a 
whorl of living chamber. The suture line is rather simple. The EL is 
longer than wide. Ll is as long as EL, is rather narrow, has a long median 
lobule and two small drooping lobules on either side. L2 is also narrow, 
but much shorter than Ll. ES is nearly as wide as deep and is unequally 
divided by a narrow lobule on its inner side. SI is about as deep as ES, 
but much narrower. The tubercle is on the inner side of Si. 
As this may not be a mature specimen and as only one specimen is 
known it does not seem advisable to make a new genus. It resembles 
Galilaeites S. Buckman 2 in the shape of the whorls and in the suture line, 
but has a relatively longer Ll, which is not leaf shaped. Compared with 
Gowericeras S. Buckman 3 , the sides ventral to the tubercles are flatter and 
the rib curve is different. The suture line of Galilaeiceras S. Buckman 4 is 
very different. 
The species name is given for D. Pender, R.N. 
1 In Yakounoceras abruptum , however, the probable umbilical contraction to the approximate sphaerocone stage 
appears to be accompanied by a passing of the whorl suture inside the line of lateral tubercles. 
2 Type Ammonites, IV, pt. 32, PI. 294 (1922). 
* Type Ammonites, III, pt. 29, PI. 254 (1921). 
* Type Ammonites, IV, pt. 32, PI. 290 (1922). 
