OCT. 1906. FOSSIL FISH-SPINE, PHLYCTAEN ACANTHUS TELLERI. 
167 
the tooth and the spine as belonging to the same species, there is 
the strong supposition that they may. Of the dentition found 
at the locality but two of t\\tm,Palaeomylus and Dinichthys, are 
of a size that might refer them to a fish that might carry a spine 
the size of Phlyctcenacanthus. We have always believed that the 
spine would prove to be that of Dinichthys, from the fact that in 
one case also it has been found associated with plates of that 
genus, also that the tubercular markings are characteristic of the 
latter, and it must therefore remain for still further discovery of 
the tooth and spine to be found with other fish remains already 
described, or to be hereafter described, before it can be fully and 
finally determined to just what genus and species they must be 
eventually assigned. 
All of the specimens figured in this paper were collected from 
the Hamilton formation at Milwaukee, Wis., by the writer, and 
are now in his private collection. 
Oct. 17th, 1906. 
DESCRIPTION OF PLATES. 
Phlyctaenacantus telleri Eastman. 
Plate 1. Type specimen, showing the upper part of the spine. 
Plate 2. Another specimen showing the angle of the anterior 
surface and that portion of the spine above the angle. 
Plate 3. Showing the angle and that portion of the spine below 
the angle and above the inserted portion, also a part 
of the second ray of the spine. 
Plate 4. The right side of a specimen that shows the inserted 
portion of the two rays, and a portion of the spine 
below the angle, also the tooth Palseomylus greenei. 
Plate 5. The left face of the specimen shown on Plate 4. 
All figures two-thirds natural size. 
