320 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



by a narrow border which appears to be flat ; there appears to be 

 some evidence of a spine on the neck segment. 



" The pygidium found in the same fragment of stone with one of 

 the specimens of the glabella of this species is in all general characters 

 that of Bathyurus. It is semicircular, convex, axis cylindrical, 

 strongly convex, terminating behind with an abruptly rounded de- 

 scent, six annulations, the first three or four most strongly defined. 

 The lateral lobes have four segments each, separated by strong 

 rounded furrows ; there is a narrow entire margin all round with a 

 distinct groove inside, which appears, however, to be interrupted at 

 the end of the axis. 



" The dimensions of the most perfect specimens are as follows : 



" Glabella — length, 3^ lines ; width at neck segment, i^ lines, at 

 the front, 2 lines ; distance of the eye from the side of the glabella, 

 i^ lines. The eye appears to be about three-quarters of a line in 

 length. 



" Pygidium — length, 3 lines ; width at anterior margin, 5| lines ; 

 width of axis, i line." 



With a number of well-preserved cranidia for study, I find that the 

 occipital segment is elevated slightly toward the center, but that it 

 does not have a spine as suggested by the specimens studied by Bil- 

 lings. Matthew, after studying the material used by Billings, states 

 that he found the surface consisting of anastomosing raised lines on 

 the front half of the glabella ; these become broken into a granulated 

 surface on the back of the glabella and cheeks, with finer granula- 

 tions in the furrows than elsewhere." To his description we may add 

 that the outer surface of the test is punctate and also marked by a 

 fine inosculating network of elevated lines or ridges that are usually 

 obscure and difficult to see even with a strong pocket lens. The 

 granulation mentioned by Matthew shows in the specimens before me 

 either on the summit of the fine ridges or on the cast of the inner 

 surface of the test. Their appearance varies with the amount of 

 rubbing down the test has received or the condition of its preservation 

 in its matrix. The associated hypostomas and pygidia have the same 

 kind of surface as the glabella. From Bonne Bay specimens I find 

 all the associated pygidia have a short spine on each side that is 

 apparently the continuation across the border of the anterior rounded 

 margin of the axial lobe of the pygidium. This same type of py- 

 gidium is also associated with Corynexochiis (Bomiia) parvulns 



' Trans. Royal Soc. Canada, 2d ser., Vol. 3, Sec. 4, 1897, p. 197. 



