154 SIXTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 

 CONOCEPHALITES SHUMARBI ( n. s.). 



PLATE VII, FIGS. 1 & 2; AND PLATE VIII, FIG. 32 & 19? 



Glabella broad, truiicate-couical, width at base greater than the 

 length, convex, gibbons in the middle, and in large specimens 

 a little flattened or depressed-convex on the sides. Posterior 

 furrows oblique, leaving a large prominent posterior lobe ; 

 middle furrow oblique and deeply marked ; anterior furrows 

 shorter and less oblique, leaving a small anterior lobe. Occipital 

 furrow somewhat strongly defined, straight in the central part, 

 curving forward at the sides : occipital ring curving forward, 

 wider in the middle. Dorsal furrow strongly marked at the 

 sides, deepl}^ indented at the anterior angles of the glabella, 

 and continued in front of the same depth as at the sides. 



Facial suture vertical in front of the eye, meeting the anterior 

 angle of the palpebral lobe opposite the anterior glabellar 

 furrow. The palpebral lobe extends as low as the posterior 

 glabellar furrow, whence the suture turns outwards and ob- 

 liquely downwards. 



Fixed cheeks of moderate width, and, in larger specimens, dis- 

 tinctly marked by ocular ridges which extend from the anterior 

 glabellar furrow to the anterior margin of the palpebral lobe : 

 the posterior limb is comparatively broad, triangular. Frontal 

 limb of medium width, rising somewhat abruptly from the 

 furrow in front of the glabella, and forming a rounded, more or 

 less prominent ridge, descending into a subcentral groove, from 

 which the anterior border rises abruptly, forming a narrow 

 ridge which is a little wider in the middle than at the sides. 



This is a well-marked species, preserving its distinguishing features even 

 in the smallest specimens. It is remarkable for the great width of the gla- 

 bella at its base, the strong glabellar furrows, and truncate apex ; while 

 the prominent ridge in front of the glabella, with the anterior furrow and 

 sharply elevated margin, are peculiar. The ocular ridges, conspicuous in the 

 larger specimens, are observable in the smaller ones. 



A small specimen gives the following measurements : Length of glabella, 

 .18 inch; width at base, between .19 & .20; width at apex, .11; fron- 

 tal limb, .09. Entire length, .32 inch. 



Several larger specimens are imperfect ; one of them being nearly twice 

 as large as the one measured. 



This species occurs, in numerous small specimens, in the ferruginous gray 

 sandstone at Kickapoo, Wisconsin, associated with Ccmocejjhalites nasutus 

 and C. diadematus'. In one specimen from a different bed, there is a single 

 individual of twice the ordinary size. Numerous specimens of considerably 

 larger size than the ordinary forms at Kickapoo have been found at Marine 

 mills on the St. Croix river, associated with C. oweni. 



