williams.] FAUNAL DISSECTION OF THE DEVONIAN. 65 
The four species absent are — 
Nucula bellistriata. Nuculites oblongatus. 
N. corbuliformis. Palseoneilo constricta. 
The naming of these species at once calls attention to the fact that 
these species and the genera to which they belong hold conspicuously 
a more important place in the fauna of the Hamilton formation of 
the eastern portion of the State of New York than in the western 
half. This remark applies also to the Pelecypoda in general. On 
the other hand, the fauna is richer in Coelenterata in Ontario than 
in its more eastern expression. 
HAMILTON FORMATION IN MICHIGAN. 
The faunal lists for the Hamilton formation of the Michigan area 
are still imperfect, but some idea of the common species may be gath- 
ered from the lists prepared by C. Rominger. a 
The occurrence of the following species is mentioned: 
Spirifer (mucronatus) pennatus. 
S. granulosus. 
Chonetes coronatus. 
(Spirigera concentrica^=) Athyris spiriferoides. 
(Phacops bufo=) P. rana. 
Other species of the Tropidoleptus fauna are recorded, but the above 
mentioned constitute 5 of the 10 species of the standard list. 
The recent investigation of the faunas in northern Michigan made 
by Mr. Grabau 6 does not increase the number of species of the domi- 
nant list. 
HAMILTON FORMATION IN WISCONSIN. 
The Milwaukee fauna analyzed by Messrs. Teller and Monroe c 
contains the following species: 
Phacops rana. 
Palseoneilo constricta. 
Nucula corbuliformis. 
Spirifer pennatus. 
Several other species of the common fauna of the Hamilton forma- 
tion of eastern New York are also reported. 
Here are enough of the representatives of the standard Tropidolep- 
tus carinatus fauna to lead to the inference that the typical fauna is 
not far distant, but whether the separation is geographical or strati- 
« Geological Survey of Michigan, 1873-1876, Vol. Ill, pp 38-63. 
''Stratigraphy of the Traverse group of Michigan, by A. W. Grabau; Rept. State Board of 
Geol Surv. Mich., for 1901-2. 
«The fauna of the Devonian formation at Milwaukee, Wis.: Jour. Geol., Vol. VII, 1899, pp. 
272-283. 
Bull. 210—03 5 
