724 THE PALEONTOLOGY OF MINNESOTA 
{Bathyurus schucherti. 
BatTHyuRuS SCHUCHERTI 7. Sp. 
This new form is represented by a series of cranidia and a single pygidium. 
Though I am reluctant to add to the imperfectly known representatives of this 
genus, these specimens present some distinctive differences from those before 
described. 
Fig. 41.—Cranidium of Bathyurus schucherti. 
The glabella is of rather large size, elongate subovoid, and gently convex, the 
dorsal furrows broad and shallow, the frontal border narrow, concave and upturned 
at the edge. The glabella bears the faintest trace of lobation, and its surface is 
smooth except for a fine granulation toward the posterior extremity. The basal 
edge of the glabella is straight and its slope to the occipital groove abrupt. Occipital 
ring broad, smooth and produced into a short median spine. 
Fig. 42.—Pygidium of Bathyurus schucherti, partially restored. x 2. 
The pygidium accompanying and undoubtedly belonging to the same species is 
rather short, very broadly concave on the pleurw, only the portions near the dorsal 
furrows being convex. Axis moderately convex, proportionally narrow, terminating 
abruptly at the concave margin. As far as preserved, it appears to be obscurely 
segmented on its anterior moiety. The pleure bear three broad ribs (beside the 
articulating rib), which are simple, separated by linear furrows extending over the 
concave area to the edge of the shield. Surface smooth. 
Horizon and locality.—Trenton limestone: Minneapolis, Minnesota; collected by C. L. Herrick, 
(Museum No. 5084.) 3 
Nore.—In the Twelfth Annual Report of the Geological and Natural History Survey of Minnesota 
(1884), p. 8, Capt. A. W. Vogdes described, under the name Bathyurus stonemani, a pygidium said to have 
come from the Trenton limestone at Minneapolis. Professor Winchell informs me that the data concern- 
ing the origin of the specimen when it was placed in Capt. Vogdes’ hands for description were not only 
vague but misleading, as it had been found by a gentleman unused to careful distinctions in such matters. 
Upon re-examination, the pygidium proves to he that of a Proetus, whose structure alone would indicate 
an early Devonian age, apart from its association in the small fragments of light brown limestone with 
an Atrypa reticularis and a Cyrtina. It appears to be unlike other known Devonian species of the genus 
and will hence retain its specific name as Proetus stonemani. The rock is presumably a fragment from 
the northwestern drift picked up in the vicinity of Minneapolis. 
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