33 
of the body chamber, that is 15 mm. in length, 13 mm. in diameter at the 
top, and 10 mm. at the base, which is the top of the septal portion. Outline 
slightly elliptical. Exterior covered with fine, longitudinal strise. Septa 
about four in 6 mm. Siphuncle eccentric, occupying about one-third the 
diameter of the shell, not well preserved but sufficiently so to show the 
nummuloid form. 
This small species is provisionally referred to the genus Protokionoceras. 
When a specimen is found sufficiently well preserved to show the characters 
of the septal funnels it will be possible to establish the generic relations. 
In the meantime the longitudinal striation combined with the evident 
nummuloid form of the siphuncle suggest the possibility of some early form 
of the Silurian genus Protokionoceras. 
Horizon and Locality. Richmond: Beaverfoot. Eleven hundred and 
fifty feet east of the trail at Palliser pass, and 50 feet above the base of 
the Beaverfoot in a section at the head of Windermere creek, Rocky 
mountains, B.C. 
Spyroceras intermedium n. sp. 
Plate VIII, figure 7 
A western form of Spyroceras which appears to be intermediate 
between Spyroceras and Dawsonoceras , As defined by Hyatt Spyroceras 
includes “longitudinally striated longicones which at some stage of their 
growth are also annulated.” Dawsonoceras forms have “longitudinal 
ridges in the larva and are annulated, but devoid of ridges in the 
adolescent and adults’ ’. S. intermedium carries both at the same time. 
The slightly oblique annulations are covered by an outer layer which is 
longitudinally striated. The specimens are not complete, but the annula- 
tions, though strongly marked where the outer cover is missing, appear 
on the outside underneath the longitudinal strise as undulations so gentle 
that they are visible only in certain lights and even in the most developed 
part of the largest fragment there is no sign either of the annulations 
taking the place of the strise or vice versa. 
The species tapers gradually. The largest piece, 26 mm. in length, 
has a diameter of 10 mm. at the larger end, and 8^ mm. at the smaller. 
In 19 mm. there are seven annulations, not exactly equal, the largest 
2f mm., the smallest a little over 1 mm.; generally speaking those at the 
smaller end are set more closely together. The hollows between are flat 
bottomed. The lower ridge appears to be imbricated over the smaller 
end of the succeeding one. Longitudinal strise If mm. apart where the 
diameter of the conch is 9^ mm. Between each pair of strise is a 
median one not so strong, but standing out in contrast with the very fine 
ones, three to four in number, which He in the hollow on either side between 
it and the large, well-marked ones. Very faint fine cross-striations are 
present, but they are too poorly preserved to count. Interior filled with 
secondary deposits so that it is impossible to be sure of the proportions 
of the siphuncle. 
