556 THE AMERICAN NATURALIST. [VoL. XXXII. 
above-described Paleomylus predator. None of these are at all 
comparable, however, with the gigantic proportions indicated 
by Belemnacanthus. 
ON THE RELATIONS OF THE DEVONIAN FISH-FAUNA 
OF MILWAUKEE. 
Although fish remains are not at all plentiful near Milwaukee, 
yet the working of the Hydraulic Cement quarries within five 
miles of the city has enabled collectors to bring together a con- 
siderable variety of chordate fossils during the course of time. 
Only three forms from this locality were known to Newberry 
when writing his Monograph in 1889. These were Rhynchodus 
excavatus, Paleomylus greenei, and Heteracanthus politus. 
Besides the forms made known in the present paper, Dinichthys 
pustulosus was described last year from material that has long 
been preserved in the Museum of Comparative Zoology. In 
addition, a few unrecorded and several new species have been 
obtained by Messrs. Teller, Monroe, and Slocum, making a total 
representation of at least fifteen species. Among the new 
species are a tuberculated Titanichthys, plates of Sphenophorus 
which prove this little-known genus to be an Arthrodire, teeth 
of Cladodus with curved crown and strong lateral denticles, 
beautiful large scales of Holoptychius, and a number of dermal 
ossifications that are undoubtedly of Chimzroid nature. One 
of the latter bears some resemblance to Myriacanthus. Some 
detached Ptyctodus tritors are indistinguishable from P. calceo- 
lus, and one of the Heteracanthus spines seems to be identical 
with H. uddeni Lindahl. 
Without question, the most interesting of all these remains, 
scientifically, is Dinichthys pustulosus. The meager material 
upon which it was founded is now increased by several more or 
less perfect crania, half a dozen dorso-median plates, the antero- 
and postero-dorso-laterals, the clavicular (which has the flat outer 
surface tuberculated), and one of the shear teeth. Unfortu- 
nately, the mandibles have thus far escaped detection. The 
writer’s prediction, based upon the peculiar ornamentation of 
this species, that it would one day prove to be a very primitive 
