04 SMITHSONIAN M ISCEI-I.ANEOUS COLLECTIONS VOL. IO3 



the ocular jilatforms are depressed, leaving the eye lobes in a promi- 

 nent position. In this species the eyes are long, and the eye bands 

 wide and heavy. Faint eye lines extend straight across the fixigenes 

 slightly anterior to the second pair of glabellar furrows. 



Sabine formation ; (loc. 17s) Sabine Mountain, Brisco Range, 

 r>ritish Columbia. 



Ilolofype.— U.S.N. M. No. 108736. 



ELLIPSOCEPHALOIDES SILVESTRIS, new species 



Plate it, Figures 1-3; Plate 12, Figure 7 



This form, intermediate between the broad and narrow species, is 

 well represented in the collections. The nearly quadrate glabella is a 

 little longer than wide and is well rounded in front. The occipital 

 ring is of even width. The fixigenes are less than half the glabellar 

 width and maintain their width throughout. The simple brim, only 

 a little narrower than the fixigenes, has an elongate boss in the middle. 

 A narrow rim is faintly indicated for a short distance in the middle 

 of the head. Wide eye lines connect the wide eye lobes wath the dorsal 

 furrow. 



The associated pygidium has a short wide axis on which three or 

 four rings are demarcated. The pleural lobes and the rear border, 

 which is as wide as the axis is long, have both pleural grooves and 

 furrows. Both extend to the margin, producing sharp ridges. Five 

 spines are developed on each side. 



Honey Creek limestone; (loc. 91b) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



Holotypc. — U.S.N.M. No. 108744a; paratypes, Nos. io8744b-d. 



ELLIPSOCEPHALOIDES SAWBACKENSIS, new species 



Plate ii. Figures 4, 5 



Only the two cranidia illustrated represent this distinctive species. 

 The glabella is longer than wide and has three pairs of glabellar 

 furrows indicated by pits. The fixigenes are about half the glabellar 

 width and vary little from front to back. Heavy eye lines connect 

 the large elevated eye bands with the dorsal furrow at a point in front 

 of the anterior pair of glabellar furrows. The brim, about half the 

 width of the fixigenes, is simple in structure but is raised as a boss 

 in the center. 



Lyell formation; (loc. 64X) Ranger Brook Canyon, Sawback 

 Range, Alberta. 



//(//rt/y/'r'.— U.S.N.M. Xo. 108745a: paratype, No. 108745!). 



