102 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



The glabella tapers considerably to a narrow truncate front. Three 

 pairs of glabellar furrows are deeply impressed, and the occipital 

 furrow and ring are strongly developed. The brim width exceeds a 

 third of the cranidial length, and the preglabellar area is somewhat 

 wider than the rim at the center. At the eye the fixigene is about 

 one-third the glabellar width. Longitudinally the head is only slightly 

 convex, except that the fixigenes are flexed at the palpebral lobe. In 

 cross section the glabella is moderately convex, with a slight indication 

 of a keel, while the fixigenes are very convex. Both the rim and pre- 

 glabellar area are highly convex owing to the depth of both dorsal 

 and anterior furrows. Posterolateral limbs bent down rather sharply. 



St. Charles limestone ; (loc. 4y) Two Mile Canyon, .south of Malad, 

 Wasatch Mountains, Idaho. 



Holotypc— U.S.N. M. No. 108828a ; paratypes, No. 108828b. 



TAENICEPHALUS MALADENSIS, new species 

 Plate 20, Figures 8-10 



Associated with T. granulosus is a smaller form with shallower 

 furrows. Its surface is not granulose but ornamented by raised 

 anastomosing lines, w'hich form a more or less reticulate network. 

 Neither the fixigenes nor the preglabellar area is as convex, which 

 gives T. maladcnsis a smoother appearance than T. granulosus. 



St. Charles limestone; (Iocs. 54X, 4y) Two Mile Canyon, south of 

 Malad, Wasatch Mountains, Idaho. 



H olotype.—U .S.N .M. No. 108826a; paratype. No. 108826b. 



TAENICEPHALUS ORNATUS, new species 

 Plate 20, Figures ii, 12 



Several species of Tacniccfhalus have been collected in Blacksmith 

 Fork canyon. They were not found at the same spot and therefore 

 may occur at somewhat different levels. Several cranidia, character- 

 ized by an ornate appearance due to the conspicuous granulation and 

 deep furrows as well as to the relatively high relief, may appropriately 

 be named T. ornafus. The rather wide glabella tapers at the average 

 rate of a rounded front and has three pairs of furrows rather deeply 

 impressed on the outside of the test. The slightly convex fixigenes 

 average nearly half the glabellar width. The brim is about one-third 

 the cranidial length. A deep anterior furrow separates the somewhat 

 thickened and considerably elevated rim which expands forward in 

 the center from a^reglabellar area of nearly equal width. The rather 

 small and very sharply bowed eyes are prominent because the palpebral 

 lobe projects outward and the fixigenes are arched at the eyes. 



