310 Point Levi Fossils* 



The head of this species differs from D magnificus in having 

 a more elongated and depressed glabella with the wide border 

 in front smooth instead of ornamented with radiating ridges. 



Limestone, No. 1. 



DlKELOCEPHALUS OwEKI. N. S. 



Fig. 8. 



Description. — Head with a broad punctured and striated margin 

 in front of the glabella; the latter oblong conical depressed, 

 most elevated along the median line and with from two to four 

 obscure depressions on each side representing the glabellar fur- 

 rows. The front of the glabella is broadly rounded, the sides 

 straight or nearly so, sub-parallel or slightly converging from 

 behind forwards ; the posterior margin straight in the middle, 

 turned forward at the sides. At the base of the glabella 

 there is an obscure transverse furrow and I am not sure whether 

 this should be regarded as the posterior glabellar groove or the 

 neck furrow. The front of the head is strengthened by a de- 

 pressed convex rim just within which there is a curved row of 

 punctures, four or five in one line. From these punctures fine 

 somewhat flexuous strise converge towards the front of the gla- 

 bella. Eyes, cheeks, thorax and pygidium unknown. 



Length of head of a specimen which appears to be of the 

 average size ten lines ; length of glabella, seven lines ; width of 

 glabella at neck segment, five lines and a half and at front mar- 

 gin four lines and a half; width of the marginal rim, one line 

 and a half. 



The depressions representing the glabellar furrows are some- 

 times obsolete and sometimes only one or two are visible on 

 each side. 



One of the specimens has the anterior striated margin propor. 

 tionally one fourth narrower than the above and only five punc- 

 tures in the width of one line. The glabella is smooth and not 

 narrowed in front. I do not at present think, however, that 

 these difl'erences are of specific importance. 



In another specimen where the crust is preserved the punctures 

 are scarcely visible but where it is removed they are distinct. 



Dedicated to Dr. D. D. Owen, whose extensive geological 

 researches in the Western States have been of such great service 

 to science. 



Limestone, No, 1. 



