NOTES OF THE FOSSIL FISH-SPINE. 
PHLYCTAENACANTHUS TElXERI (EASTMAN). 
By Edgar E. Teller. 
To the specialist and student of palseichthyology the fossil fish 
remains as found in the Hamilton limestones at Milwaukee, Wis- 
consin, possess more than ordinary interest. While never found 
in any great quantity, and then found only in a fragmentary 
condition, the state of preservation is nevertheless in what we 
might term a very good condition, and consists entirely of the orig- 
inal external bony plates, spines, scales and teeth, almost all of 
which are really remarkable. Local collectors for nearly a quarter 
of a century have from time to time fortunately secured a single 
specimen or two, until in the aggregate quite a quantity of material 
of several species has been brought together which, in the hands 
of one or two specialists, has resulted in bringing to the notice 
of those interested valuable additions to the known fauna of the 
period. 
In 1898 Dr. C. R. Eastman of the Cambridge Museum of 
Comparative Anatomy published in the American Naturalist a 
series of papers describing and figuring several species new to 
science from this locality. In volume XXXII, No. 380, pp. 550-552 
(August, 1898) of that journal, in a continued article on the den- 
tition of devonian Ptyctodontidse he describes the figures as a new 
genus and species the spine P hlyctcenacanthus telleri. We copy 
a portion of this article as follows : 
ASSOCIATED ICHTHYODOEULITES. 
"Rohon* in his paper on Ptyctodus mention the occurrence 
in the Russian Devonian of dorsal fin-spines belonging to the 
so-called "Chimoeroid type of ichthyodorulites," as defined by 
Jaekel**. 
As no other form with which the remains can be theoretically 
*Rohon, J. V. Beitrag zur Kenntniss der Gattung Ptyctodus, Ver- 
handl. Mineral Gesellsch. St. Petersburg, Vol. XXXIII, pp. 1-16 (1895). 
** Jaekel, O. Ueber fossile Ichthyodoruliten, Sitzungsber. Gesellsch, 
naturforsch. Freunde, Berlin. No. 7, p. 123 (1890). 
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