﻿37 Descriptions of Species i i 



figures this structure and says that "although the nature has 

 not been full}- demonstrated it has generally been called an 

 ocellus." Only one of our specimens showed this structure. 

 The specimen figured is an adult. Although a large number of 

 specimens of this species has been found, they are all in a poor 

 state of preservation. 



The characters of the glabellas of this species are so distinct 

 from that of any other figured species that it has been placed in 

 a new species. The pygidium figured in Bull. 13, PI. 16, Fig .4, 

 as Asaphus convexns (?) may be found, upon further investiga- 

 tion, to be the pygidium of this species. 



Localities. — In the upper portion of the Calciferous formation 

 at Ft. Hunter, Tribes Hill, and Canajoharie, 

 N. Y. 



Bathyurus ellipticus Cleland. PI. 3, Fig. 3. 



B- ellipticus, Am. Pal., Vol. 3, Bull. 13, 1900, p. 17; pi. 16, figs. 5, 6. 



A pygidium, which is probably that of this species, was found 

 at Tribes Hill. The description is as follows : Pygidium minute, 

 semi-circular, sloping evenly to the margin, equally lobate, bor- 

 der thickened and moderately wide. The axis is composed of 

 four aunulations and tapers regularly to an obtuse, rounded ter- 

 mination. Pleura broad and bear four annulations which are 

 faintly grooved near the distal extremities. Surface rough. 

 Distribution. — Occurs in the upper portion of the Calciferous 



at Ft. Hunter, Tribes Hill, and Canajoharie, 



N. Y. 



Harrisia parabola Cleland. PI. 3, Figs. 4, 5. 



H. parabola, Am. Pal., Vol. 3, Bull. 13, 1900, p. 15, pi. 16, figs. 1, 2, 3. 



The pygidium of this species had not been found when the 

 species was first described. The following description is based 

 upon several pygidia associated w*ith the cephalons of this species 

 found at Tribes Hill, N. Y. Pygidium subtriangular ; the pos- 

 terior extremity truncated, very convex, sloping rapidly to the 

 lateral and posterior margins. Border thickened and convex, 

 broad in proportion to the size of the pygidium. The measure- 

 ment of the largest specimen is 5 mm., of the smallest 1)4, mm. 



Distribution. — As far as known this species occurs only in the 

 upper portion of the Calciferous formation of 

 the Mohawk Valley of N. Y. 



