12 
Horizon and Locality. In a sandstone bed near the top of the Yakoun 
formation, on the northeast shore of Maude island. 
Type . National Museum of Canada, Ottawa; holotype, Cat. No. 
9005. 
Genus, Toricelliceras S. Buckman 
Toricelliceras newcombii (Whiteaves) 
Plate Y, figures 2, 3, 4 
1900. Hoplites newcombii Whiteaves, Geol. Surv., Canada, Mes. Foss., 
I, pt. 4, p. 281, PI. 37, figs. 1, la. 
Diameter 
35-6 
38-5 
48-0? 
34-3 
25 
60 
30-5 
39-0 
46-7 
36-6 
27-0 
38-9 
50-0 
370 
200 
37-5 
51-5 
39-5 
Height, whorl 
Thickness, whorl 
Width, umbilicus 
Primary ribs 
Secondary ribs 
The first measurement is taken near the anterior and the last about 
one-tenth whorl in front of the posterior end of the ultimate whorl. The 
whorl shape is that of a stout-whorled serpenticone, latumbilicate, the 
umbilicus contracting with growth. The whorl suture is on the outer 
edge of the lateral tubercles. The whorls are thicker than high. The area 
inside the tubercles is narrow, somewhat flattened and divergent; the area 
outside the tubercles is wide, gently convex, and convergent; the venter is 
tabulate, but is becoming rounded on the anterior part of the ultimate 
whorl. The inner margin is narrow, and its edge abruptly rounded; the 
very angular edge on one side of the specimen is caused by distortion. 
The living chamber preserved is about seven-eighths of a whorl, but the 
aperture is not known. The narrow, elevated, primary ribs are straight 
and inclined on the sides, increase in number with growth, and end in 
narrow, elevated, sharp transverse tubercles. From each tubercle arise 
two secondary ribs and there are some single intercalated secondary ribs. 
The secondary ribs are narrow, elevated, inclined on the sides, but bend 
back ventrally and proceed straight across the tabulate area. The ribs 
are raised and slightly thickened on the borders of the tabulate area; on the 
anterior part of the ultimate whorl the tabulate venter is beginning to lose 
the feeble bordering of incipient tubercles and is becoming rounded. 
The suture line is fairly simple and little lobate. E3 is very deep. 
LI is long and narrow, is about as long as EL, has a long, narrow terminal 
lobule and two short, drooping lobules on either side. SI is smaller than, 
and not as deep as, ES. The tubercle is on its inner edge. 
In proportional thickness of whorl this species resembles Toricelliceras 
torricelli (Oppel) 1 , but in proportional height is less and in umbilication is 
somewhat greater. The suture line is very close to that of T. subsulcatum 
S, Buckman 2 , particularly in the shape of LI. The whorls of T. new- 
combii, however, are proportionally thicker, the venter is not subsulcate, 
the tubercles on the borders of the tabulate area are not so well defined, 
and the secondary ribs are more numerous, narrower, and more elevated. 
USuckman, S. S.: Type Ammonites, pt. 32, PI. 292 (1922). 
*Type Ammonites, pt. 33, PL 310 (1922). 
