724 THE PALEONTOLOGY OF MINNESOTA 



[Haihyimis BChuohertl. 



BATHYURUS SCHUCHERTI n. 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 fiathyurus schuc.li?rti, partially restored, x 2. 



The pygidium accompanying and undoubtedly belonging to the same species is 

 rather short, very broadly concave on the pleurae, 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 pleurae bear three broad ribs (beside the 

 articulating rib), which are simple, separated by linear furrows extending overHhe 

 concave area to the edge of the shield. Surface smooth. 



Horizon and locality. Trenton limestone: Minneapolis, Minnesota: collected by C. L. TIerrick, 

 (Museum No. 5084.) 



NOTK. In tin' Twelfth Annual Report of the Geological and Natural History Survey of Minnesota 

 (1884), p. 8, Capt. A. W. Vogdes described, under thf name Rtithi/unix slonrmani, a pygidium said to have 

 conn- from the Trenton lime-.tonr at M inm-a pulls. Professor Wirichell informs me that the data concern- 

 ing tin' origin of the sp t . cimi'ii when it was placed in Capt. Yogdrs' hands for description were not only 

 vague but misleading, as it had been found by a gentleman unused to careful distinctions in such matters, 

 f'pon re-examination, the pygidium proves to lie that of a Froetus, whose struct lire alone would indicate 

 an early Devonian age, apart from its association in the small fragments of light brown limestone with 

 an Alri/pa reticnlarin and a Cyrtina. It appears to be unlike other known Devonian species of the genus 

 and will hence retain its specific name as I'rnrtii* xtnni'innni. The rock is presumably a fragment from 

 the mirth western drift picked up in the vicinity of Minneapolis. 



