WILLIAMS.] 
FAUNAL DISSECTION OF THE DEVONIAN. 
63 
If now we make a revised list by adding to the standard list based 
on the 146 faunules the new distributional values of all the species as 
they appear in the 37 TTnadilla faunules, they will then stand as in 
Table VII, the numbers at the right expressing the distributional 
values of the species in the 146 + 37=183 faunules. 
Table VII. — Tropidoleptus fauna: Revised list of dominant species of the Ham- 
ilton formation of eastern New York and Pennsylvania, as expressed in 183 
faunules. 
1. Spirifer pennatus 130 
2. Tropidoleptus carinatus 109 
3. Spirifer granulosus 66 
4. Chonetes coronatus 65 
5. Amboccelia umbonata. 63 
6. Palaeoneilo constricta . . . . . . 63 
7. Nuculites oblongatus . 48 
8. N. triqueter 47 
9. Nucula bellistriata _ _ 47 
10. Phacops rana 38 
11 . Athyris spiriferoides . _ . 36 
12. Nucula corbuliformis ... 33 
13. Leiorhynchus laura - _ 30 
14. Paracyclas lirata . 29 
15. Chonetes scitulus . ._ 24 
16. Stropheodonta perpiana _ _ . 21 
It will be observed that the first 12 species of this table are the 
same as the 12 species in the standard list (Table V), and that none 
of the 4 species which were specially dominant only in the Unadilla 
list reach as high distributional value as do all of those of the stand- 
ard list. The new facts brought in by the additional statistics derived 
from the same general region do not disturb the general results 
obtained by consideration of the smaller number of faunules. 
STATISTICS BASED ON ANALYSIS OF THE ZONES OF THE 
LIVONIA SALT SHAFT. 
The faunules discussed b}^ Prosser in his paper on eastern New York 
and Pennsylvania under the designation of Hamilton do not definitely 
include the Marcellus. The list of faunules reported by Cleland from 
Cayuga Lake begins with the Marcellus. Mr. Grabau's analyses of 
the Hamilton group of Eighteenmile Creek take in the transition zone 
of the top of the Marcellus. The conclusions, therefore, reached from 
study of the statistics reported by these men deal with the pure Ham- 
ilton fauna. 
•Dr. Clarke has given an analysis of the species discovered in the 
Livonia salt shaft, a which runs lower than the other records, taking 
in the Marcellus and Onondaga faunas. In his list for the part of 
the record covering the Hamilton formation, all the abundant species 
of the other lists are reported, with the exception of Nucula corbuli- 
formis, but the frequency of records in the separate faunule lists is 
not so emphatically expressed as in the lists formed with the definite 
purpose of recording frequency values with precision. Dr. Clarke 
separates the series above the Marcellus into 10 zones, but the recorded 
species reach, in the highest case, only 10/16 of frequency value. This 
is the case of Phacops rana, which is recorded ten times. 
a The succession of the fossil faunas in the section of the Livonia salt shaft, by John M, Clarke: 
Thirteenth Ann. Rept. State Geologist New York, 1893, Vol. I, Geology, pp. 131-158, 
