6 
MUSEUM BULLETIN NO. 29. 
Buchdola dilata n. sp. 
Plate I, figure 7. 
Outline and general features as shown in the figure. This shell 
differs from B, retriostriata in the character of the ornamentation on the 
radiating ribs. The transverse retrally curved ridges which cross the 
radiating plications are coarser and much more widely spaced in this shell 
than in B. retriostriata . The total number of these transverse ridges on 
the longer ribs does not exceed ten or twelve, whereas on a normal specimen 
of B. retriostriata th^re are two and a half to three and a half times that 
number. This shell bears some resemblance in the wide spacing of these 
ridges to B. halli, but the absence of the fine concentric lines which cover 
the nodes of that species distinguishes the two. 
The species is known only from the single specimen figured. 
Horizon and Locality. Simpson shale; Mackenzie river 5 miles above 
Rabbitskin river. 
Paracardium doris Hall? 
t . 
Paracardium doris Hall, Pal. N.Y. 1885, vol. Y, pt. I, p. 428, pi. 70, figs. 
10 - 11 . 
The collection contains a single fragmentary shell which probably 
belongs to this species. 
Horizon and Locality. Simpson shale; 5 miles above Rabbitskin 
river. 
pte!ropoda. 
Styliolina fissurella Hall. 
JStyliolina .fissurella Hall, Pal. N.Y., vol. Y, pt. II, p. 178, pi. 31 A, figs. 1-36. 
This minute, needle-like pteropod occurs sparingly. It is unknown 
in this fauna in the extreme abundance which characterizes its presence 
in some of the dark shales of the upper Devonian in New York, probably 
because this dark shale facis appears to be absent from the Portage of 
Mackenzie River province. 
Horizon and Locality . Simpson shale; Mackenzie river, 11 miles below 
Wrigley. 
Tentaculites mackenziensis n. sp. 
Plate I, figure II. 
Shell conical with a very attenuate apical part which ^lightly expands 
about 1 mm. above the tip of the cone. Length about 5 mm. and width 
at the aperture 1 mm. Annulations very fine and closely placed extending 
to the tip of the cone. They increase regularly in size to the aperture and 
number about 100. Longitudinal striee are absent. 
This species differs from T. tenuicinctus in its more rapid expansion, 
its width at the aperture being about three times that of T. tenuicinctus . 
t 
