104 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



TAENICEPHALUS HYRUMENSIS, new species 

 Plate 20, Figures 13-18 



This species is represented by a number of cranidia, a hypostoma, 

 and several pygidia. It is characterized by the smoothness of the test. 

 Slight indications of granulation are found on parts of the glabella 

 and rim. They are more clearly developed on the preglabellar area. 

 The rather long, fairly. slender glabella tapers to a rounded front. 

 Faint furrows are present on the test, but in exfoliated specimens 

 three well-developed sets can be seen. Brim width less than half the 

 glabellar length, divided by the anterior furrow into about equal parts. 

 The fixigenes average less than half the glabellar width. Postero- 

 lateral limbs fairly large. Eyes of moderate size, moderately bowed. 

 The associated pygidium is rather large and fiat, approaching that of 

 Wilbernia in several respects, but it lacks the pronounced doublure 

 of that genus. It is possible that this pygidium should be referred to 

 T. modestus from the same locality. 



St. Charles limestone; (loc. 55h) Blacksmith Fork, Bear River 

 Range, Utah. 



Holotype. — U.S.N.M. No. 108830a ; paratypes, Nos. io883ob-e. 



TAENICEPHALUS MODESTUS, new species 

 Plate 21, Figure 7 



A single cranidium is sharply demarcated from the other species at 

 the locality. Its reference to Taeniccphalus may be questioned because 

 of the width of the cranidium across the brim and the flatness of the 

 whole. However, it is closer to this genus than to Elvinia, which it 

 most resembles. The glabella tapers at the normal rate and has 

 average proportions. Several sets of furrows are faintly indicated, 

 while the occipital furrow is rather deep. The brim width is half the 

 glabellar length exclusive of the occipital ring. Both the preglabellar 

 area and rim are convex and of about equal width. Fixigenes, eyes, 

 and course of the suture are approximately normal, except that the 

 anterior branch of the suture diverges slightly more than average. 



St. Charles limestone; (loc. 55h) Blacksmith Fork, Bear River 

 Range, Utah. 



JJolotype.—U.S.'HM. No. 108835. 



TAENICEPHALUS TEXANUS, new species 

 Plate 21, Figures 8-12 



All of the 10 or more cranidia are normal in size and shape with a 

 projecting front due to the forwardly expanded rim. The glabella 



