64 
CORRELATION OF GEOLOGICAL FAUNAS. 
[BULL. 210. 
The species occurringthe greater number of times in the 10 faunules 
reported are as follows : 
Table VIII. — Tropidoleptus fauna: List of species appearing most frequently 
in the 16 zones of the Hamilton formation of the Livonia salt shaft. 
*1. Phacops rana 10 
2. Diaphorostoma lineatum ... _ 8 
3. Orthoceras nuntium 7 
4. Chonetes scitulus 7 
5. Orthis vanuxemi 7 
6. Orthothetes arctistriatus 6 
7. Productella spinulicosta 6 
H) 
8. Bellerophon leda 
9. Actinopteria decussata 
Streptelasma rectum . . 
*11 . Spirifer pennatus 5 
12. Orbiculoidea media 5 
*13. Chonetes coronatus 5 
*14. Ambocoslia umbonata 5 
Those of the standard list are marked with asterisks, and consti- 
tute only 4 of the list of 14, and only 1 of those among the first 10. 
The other species of the Livonia list (with the exception of the sec- 
ond) are, however, all reported from rocks of the Hamilton formation 
in the East. The high range value assigned to species in the Livonia 
section, which take a relatively less conspicuous place in both the 
Cayuga Lake and the Eighteenmile Creek sections, may be explained 
on the supposition that the author gave closer attention to the species 
by which the several zones can be distinguished than to those com- 
mon species which appear most frequently throughout the series. 
Otherwise it is necessary to assume from the records that the common 
species appear less frequently in the zones of the Livonia section 
than would be expected from all the other statistics which were gath- 
ered specially to ascertain the range and distributional values. 
HAMILTON FORMATION IN ONTARIO, CANADA. 
The species of the Hamilton formation of Ontario, Canada, as 
reported by Dr. Whiteaves/' include 8 of the standard list of 12 dom- 
inant species of the Tropidoleptus fauna, and several of those quoted 
as more or less dominant not among the first 12. 
The list of species is given in Table IX. They are arranged alpha- 
betically, because the statistics regarding range or distributional fre- 
quency are not reported. 
Table IX. — Tropidoleptus fauna: Species of the standard lists of the Hamilton 
formation of NewYork State which are also reported from the Hamilton for- 
mation of Ontario, Canada. 
* Ambocoslia umbonata. Orthothetes arctistriatus. 
* Athyris spiriferoides. * Phacops rana. 
* Chonetes coronatus. Primitiopsis punctilifera. 
C. lepidus. • Rhipidomella vanuxemi. 
C. scitulus. * Spirifer granulosus. 
. Cryphaeus boothi. *S. (mucronatus) pennatus. 
* Nuculites triqueter. * Tropidoleptus carinatus. 
a On some additional or imperfectly understood fossils from the Hamilton formation of Onta- 
rio, with a revised list of the species therefrom, Ly J. F. Whiteaves: Contributions to Canadian 
Palaeontology, 1885-1898, Vol. I, Part V, pp. 361-436, Pis. XLVIII-L. 
