308 G. J. HINDE ON CAMBRO-SILURIAN 
pressed and acute; a very strongly marked broad and sharp edge 
on the outer curve, and a similarly sharp but narrower edge on the 
inner curve of the tooth; the central portion convex in section. 
Length 17 line, width of base 3 line. 
Loc. Garrison Common, near Toronto, Ontario. 
PRIonrIopUS ELEGANS, Pander. (Pl. XY. fig. 10.) 
Prioniodus elegans, Pander, Monographie, p. 29, tab. ii. figs. 22, 23. 
Basal portion straight and narrow; at the anterior extremity is 
an elongated tapering main tooth, the lower portion of which appears 
to extend below the front part of the base. On the base are thirteen 
straight, delicate, poimted denticles nearly uniform in size. Both 
main tooth and denticles convex in section. Length of main tooth 
= line, of the horizontal base 2 line. 
My example has not the exterior denticle or the sharp edges 
of the main tooth of Pander’s example, but in other respects it is 
similar. J have found but a single specimen. 
Loc. Garrison Common, near Toronto, Ontario. 
Prioniopus? porirus, Hinde. (Pl. XY. figs. 11, 12.) 
Basal portion of tooth compressed, uneven in width, straight or 
slightly curved; at or near the central part a short robust main tooth 
with a series of short compressed denticles, varying from five to 
eight in number, on either side of it. Length of base from 3 line to 
? line. The specimens haye a bright polished appearance and a 
light horny tint. 
Loc. Garrison Common and Don valley, near Toronto, Ontario. 
Prioniopus FuRcATUS, Hinde. (Pl. XV. fig. 13.) 
Base narrow and strongly arched, at the centre of the arch a 
prominent robust main tooth, slightly curved, depressed convex, and 
with sharp edges, the lower extremity blunted and produced beyond 
the base. On one side of the central tooth the base carries six flat- 
tened denticles inclined to the centre; on the other side are eight 
similar denticles, but vertical to the base. Length of main tooth 2 
line; distance between the extremities of the base 3 line. . 
The strongly arched form, the prominence of the main tooth, and 
its extension below the base distinguish this from the foregoing 
species. 
Loc. Garrison Common, near Toronto, Ontario. 
Remarks on the Cambro-Silurian Conodonts. 
It is worthy of notice that of the six species above described no 
fewer than three should be identical with, and the other three should 
- have a close general resemblance to, the forms discovered by Pander 
near St. Petersburg. At the same time there is by no means the 
Same proportion in respect to the number of the species of the sim- 
ple and compound teeth found in the two countries ; for whilst there 
is nearly an equal number of the compound forms in the Cambro- 
Silurian of Canada as of Russia, only two species of the simple teeth 
