48 
PALEONTOLOGY OF NEW YORK. 
in the limestone near the base of the Hamilton shales, at Centerfield, and in the 
upper shales on Canandaigua Lake, Ontario county. In the Tully limestone 
at Tinker’s Falls, Onondaga county; Goodwin’s, Cayuga Lake, and near Lodi 
Landing, Seneca Lake. 
Dalmanites (Cryph^us) Barrisi, n. sp. 
PLATE xvr A, FIG. 18. 
Specimens of pygidia from the buff and drab Devonian limestones in the State 
of Iowa, present certain peculiarities Avhich will not permit their union 
with either of the foregoing species. The general aspect of these caudal 
shields is quite similar to that presented by very young individuals of Dal¬ 
manites Boothi, var. Calliteles, with the exception that in the latter the axial 
spine is scarcely developed, while in the Iowa species it is conspicuous 
and broader than any of the lateral spines. The lateral spines are long, 
round, slender and terete, with a gentle backward curve; slightly thickened 
at the base, and not elevated along the middle as in the New York species. 
They are also relatively much larger tluin in any adult specimen of the var¬ 
iety Calliteles observed. 
The axis of the pygidium tapers rapidly, and bears from six to eight annu- 
lations, which have a strong forward inclination in the middle. 
All the specimens representing this species are small, but are of about the 
same size, and have undoubtedly attained their mature growth. The best 
preserved of the specimens has a length of 8 mm. to the extremity of the 
axial spine, a width of 9 mm. along the anterior margin to the bases of the 
lateral spines; the length of the anterior spines is 5 mm. 
Distribution. Hamilton group. In the limestones usually referred to this 
horizon near New Buffalo, and at Searstown and Iowa City, Iowa. 
