PALZ ONTOLOGY. 125 
The tendency to exfoliation which my specimens exhibit renders accurate determination of 
their surface markings difficult. The visceral region is scarcely flattened, but in other respects 
the shell corresponds well with the description of P. splendens. 
The wings are very prominent and distinctly arched, and the surface of the shell occupied 
by the bases of relatively large, scattered spines. 
A larger amount of material from the locality may show this to be a distinct species, but the 
number and preservation of my specimens do not warrant me in considering it new. In size 
it resembles P. Wabashensis, N. & P., but it is more revolute, the mesial sinus deeper, the 
wings more inflated, and it dssparesitly lacks the striations which P. Wabashensis usually ex- 
hibit, even when not in good preservation. 
PRODUCTUS SCABRICULUS. Martin. Animauax Foss. dans le Terrain Carbonifére de Belgique, 
p. 190 : 
Among the Producti which I collected about Santa Fé are several which seem undistinguish- 
able from the European scabriculus: a broadly expanded shell, with rounded outlines and the 
peculiar surface markings described by De Konninck; the striew interrupted and terminating 
in tubercles, which are set in quincunx; annulations broken and inconspicuous, &c. 
The correspondence is so complete that it is difficult to resist the conviction that if Martin’s 
scabriculus exists in America the shell to which I have referred is of that species. There is 
little resemblance between my specimens and Marcou’s figures of what he calls P. scabriculus, 
(Op. cit., pl. V, figs. 6 and 6a,) which represent a much narrower shell and one distinctly annu- 
lated, withoat tubercles, except near the beak. His description agrees better with the true 
scabriculus, and it may be that there is an error in lettering the plate. 
In Europe the station of P. scabriculus is Lower Carboniferous and Upper Devonian, as is 
true of many of the fossils associated with it in the limestones of New Mexico. Notwithstand- 
ing that fact, we must regard this limestone as Upper Carboniferous, as the fossils which 
characterize it are all found in the Coal measures of the Mississippi valley and in the coal fields 
of Kansas and Missouri, where the entire Carboniferous series approaches nearest to the 
exposures of the rock in question. 
This discrepancy of station in what have been regarded as the European and American 
representatives of the same species suggests the probability that a revision of the matter of 
the identification of this species, accompanied by a careful comparison of a sufficient number 
of specimens, will show specific differences, which will relieve the subject of many of its diffi- 
culties. This is, however, not a necessary result; for, as has been shown,* the local faune of 
parallel formations in palwozoic times exhibited, in some degree, the diversity which is so 
conspicuous in those of the present epoch. 
I am not aware that P. scabriculus has been recognized in America elsewhere than in New 
Mexico. 
STREPTORHYNCUS. King. 
STREPTORHYNCUS UMBRACULUM 
Orthis umbraculum. VY. Buch. Ueber Delthyris, dc. 
This shell is very widely distributed through the Carboniferous strata of the west, its range, 
vertical and geographical, being perhaps equal to that of any other species. 
If palwontologists have not been mistaken in their identifications, it is not only common 
to Europe, America and Asia, but runs through all the Carboniferous series from the Permian 
down, and is found in the Devonian strata of the Eifel and in the fine-grained sandstones, the 
equivalents of the Chemung group, in Ohio and Kentucky. : 
Prof, J. Hall, in Report of Foster & Whitney, & 
