38 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
greatly to be deprecated. Barrande’s Coccosteus fritschi, as von Koenen has 
already surmised, is probably founded on the dorso-median of Aspidichthys. 
Formation and Locality. — Middle Devonian (tage Gg1); Bohemia. 
Dinichthys tuberculatus News. 
1888. Dinichthys tuberculatus, J. S. Newberry, On the Fossil Fishes of the Erie 
? Shale of Ohio (Trans. N. Y. Acad. Sci., Vol. VII. p. 179). 
1889. Dinichthys tuberculatus, J. $. Newberry, Paleozoic Fishes of North America 
(Monogr. U. S. Geol. Surv., Vol. XVI. pp. 98, 99, Pl. XXXII. Fig. 8). 
1889. Dinichthys pustulosus (errore), M. Lohest, De la découverte d'espèces améri- 
caines de poissons fossiles dans le Dévonien supérieur de Belgique (Bull, 
Soc. Géol. Belge, Vol. XVI. p. lvii). 
1892. Dinichthys pustulosus (errore), [E. D. Cope], American Devonian Fishes found 
in Belgium (Amer. Naturalist, Vol. XXVI. p. 1025). 
It is proper to record this species in connection with the foregoing, not only 
in order to complete the list of European representatives of the genus, so far as 
they have been described, but also because this is the only species of Dinichthys 
which is known to be common to both continents. This form may be regarded 
as the connecting link between the Old World species and the New; not that 
all the American Dinichthyids were derived from this species, but that this is 
one of the bonds through which the ancestry of the Western fishes can be traced 
backward to its starting point in Northern Europe. This chain of forms leads us 
eastward from Manitoba, through Iowa, Wisconsin, and Ohio, to New York and 
Pennsylvania; from the last named State D. tuberculatus carries us across the 
Atlantic to Belgium ; next we meet with D. eifeliensis and D. pelmensis in 
Germany, followed by one species in Bohemia; and finally we come up with 
D. trautscholdi and D. livonicus associated with the ancestral Coccostews and 
other derivatives from the same stock in the Devonian of Northwest Russia. 
Formation and Locality. — Chemung Group; Pennsylvania. Psammite de 
Condroz ; Belgium. 
It remains only to present a description of certain Dinichthyid remains from 
the Hydraulic Limestone beds of Milwaukee, Wisconsin, a locality from which 
none have hitherto been known. 
Dinichthys pustulosus sp. nov. 
Plate 3, Fig. 4. 
The F. H. Day Collection, purchased by the Museum of Comparative Zoöl- 
ogy in 1881, contains a number of fish remains from the Hydraulic Cement 
Quarries near Milwaukee, Wisconsin. Among them are two plates whose 
preservation is such as to warrant description, especially since up to the 
present time but two species (Rhynchodus greenei and Heteracanthus politus) 
have been noticed trom this locality. 
