I06 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



middle by a wide bar. The brim width is just about half the glabellar 

 length including the neck ring. The rim, not greatly expanded beyond 

 the anterior angles, is much narrower than the preglabellar area. 

 Fixigenes rather wide, averaging over three-fourths the glabellar 

 width. Behind the eyes the sutures do not diverge rapidly, thus form- 

 ing wide and rather short posterolateral limbs. Anterior to the eyes 

 the divergence of the suture is not great, which leaves only moderate 

 anterior angles. The eyes are fairly sharply bowed. The palpebral 

 furrow in line with the facial suture has little curvature and a wide 

 eye band ; hence the eyes are prominent. Longitudinally the head 

 does not have great convexity. Laterally, although both the glabella 

 and fixigenes are convex, the total relief is not great. Anterior angles 

 only moderately depressed and the posterolateral limbs even less. 



Mendha limestone; (loc. yj) i mile north of Italian Ranch foot- 

 hills, Quinn Canyon Range, Nevada. 



HoIotype.—lJ. S.N. M. No. 108838a; paratypes, Nos. io8838b-d. 



TAENICEPHALUS CASTLENSIS, new species 



Plate 21, Figures 24, 25 



Several cranidia are in the small collection from this locality, which 

 is situated between the Yellowstone Park and the occurrences of 

 Taenicephalus species north of the Gallatin River. It is typical in 

 most respects. The moderately long glabella tapers to a truncated 

 front. Three pairs of furrows are sharply impressed on the exfoliated 

 holotype, and the occipital furrow is wide. In the center the brim 

 width is a little less than half of the glabellar length including the 

 occipital ring. It consists of approximately equal subdivisions. The 

 rim tapers rapidly to extinction at the anterior angles which are 

 somewhat rounded. Both rim and preglabellar area have about the 

 same degree of convexity. Anastomosing lines cover the preglabellar 

 area, and a few scattered granules appear on the rim. Eyes, fixigenes, 

 and posterolateral limbs are of normal size and proportions. 



Dry Creek formation ; (loc. 62s) Castle Peak, north of Squaw 

 Creek, Gallatin Range, Montana. 



Holotype— U.S.N.M. No. 108839. 



TAENICEPHALUS WYOMINGENSIS, new species 

 Plate 21, Figure 32 



A small collection from the Big Horn Mountains contains a good 

 species of Taenicephalus. It is close to T. cordillereiisis Miller from 

 tlic ^^■ ind River Range but has a wider preglabellar area. Compared 



