368 G, J. HINDE ON CAMBRO-SILURIAN 
lines can be seen. Length of the straight portion 3 line, of the 
hook 3 line. 
These small shining bodies are very abundant in the same beds 
with the Conodont teeth and plates, and though diverse in form, 
they correspond in apparent structure and relative dimensions ; 
therefore I regard them as related to the same organisms, and place 
them provisionally under the same genus with the equally proble- 
matical plates and teeth. 
Loc. North Evans, New York: from the ‘‘ Conodont-bed ” of the 
Hamilton group. 
EXPLANATION OF THE PLATES. 
PLATE XV. 
Figs. 1-6. Prioniodusradicans,H. Figs. 2, 3, 4, 5 are front views; fig. 1 and 6 
show the reverse side with the longitudinal groove; x 10. Gren- 
ville, Province Quebec. (Chazy.) 
7, 8. Drepanodus arcuatus, Pander: X 10. Toronto. (Cincinnati.) 
9. Distacodus incurvus, Pander: x 10. Toronto. (Cincinnati.) 
10. Prioniodus elegans, Pander: < 20. Toronto. (Cincinnati.) 
? politus, H.: X 20. Toronto. (Cincinnati.) 
13. —— furcatus, H.: x 20. Toronto. (Cincinnati.) 
14, erraticus, H.: X 20. North Evans, N.Y. (Hamilton and 
Carboniferous. ) 
15. abbreviatus, H.: x 20. North Evans, N.Y. (Hamilton.) 
16. clavatus, H.: <X 20. North Evans, N.Y. (Hamilton.) 
17. angulatus, H.: X 20. North Evans, N.Y. (Genesee and 
Carboniferous. ) 
18, 19 acicularis, H.: x 20. Kettle Point, Ontario. (Genesee.) 
20, 21 armatus, H.: <x 20. North EHyans, N.Y. (Genesee.) 
Puatr XVI. 
Figs. 1,2,3. Prioniodus spicatus, H.: x 20. North Evans, N.Y. (Genesee.) 
4, Panderi, H.: Xx 20. North Evans, N.Y. (Genesee and 
Hamilton.) 
5. ? alatus, H.: x 10. North Evans, N.Y. (Hamilton.) 
6-18, Polygnathus dubius, H.: x 20. Figs. 6-12 represent different forms 
of pectinate teeth ; figs. 13 and 14 fimbriate teeth ; figs. 15, 16, 
17 crested teeth; and fig. 18 shows the reverse side of one of the 
plates of this species. Kettle Point, Ontario; North Evans, 
N.Y.; and Bedford, Ohio. (Hamilton, Genesee, and Carboni- 
ferous.) 
19. duplicatus, H.: x 20. Bear Creek, Ontario. (Genesee.) 
20. —— radiatus,H.: xX 20. Kettle Point, Ontario. (Genesee.) 
21 immersus, H.: x 20. Kettle Point, Ontario. (Genesee.) 
22 nasutus, H.: x 20. North Evans, N.Y. (Genesee.) 
23 princeps, H.: x 20, North Evans, N.Y. (Genesee and 
Hamilton.) 
Puatre XVII. 
Fig. 1. Polygnathus coronatus,H.: X 20, Kettle Point, Ontario. (Genesee.) 
2. solidus, H.: * 20. North Evans, N.Y. (Hamilton.) 
3. erassus, H.: X 20. North Hyans, N.Y. (Hamilton.) 
4,5, ——? serratus, H,: X 20. Kettle Point, Ontario, (Genesee.) 
