NO. 5 UPPER CAMBRIAN TRILOBITES RESSER lOI 



TAENICEPHALUS LIBERTYENSIS, new species 



Plate 19, Figures 28-32 



Several cranidia, a libragene, and several small pygidia are contained 

 in the collection from this locality. Only the larger of the specimens 

 have been figured. The species is characterized by normal shape and 

 development of the several parts, with the possible exception of a 

 flattening in the preglabellar area. The glabella tapers at a normal 

 rate. On the outer surface its anterior outline is straighter than on 

 exfoliated specimens, a condition due to widening of the dorsal furrow 

 in the latter instance. Two pairs of furrows show on the outside and 

 three on the inside of the test. The deep occipital furrow is irregular. 

 The neck ring has a small spine. Fixigenes are about half the glabellar 

 length exclusive of the occipital ring. Rim slightly elevated and 

 thickened, expanding forward somewhat in the middle where it is 

 only slightly less wide than the preglabellar area. Eyes are normal 

 size and moderately bowed. In cross section the curvature is not 

 great in the central portion of the cranidium. In spite of the depressed 

 anterior angles the front margin is nearly straight but has considerable 

 relief because of the greatly depressed posterolateral limbs. Libragene 

 normal in size and shape, with a rather wide and possibly short genal 

 spine. The associated pygidium is normal in all respects. 



St. Charles limestone; (loc. 56g) 6 miles west of Liberty, Bear 

 River Range, Idaho. 



Holofype.—V.S.'NM. No. 108824a; paratype, No. To8824b. 



TAENICEPHALUS CORDILLERENSIS Miller 



Plate 19, Figure 33 



Taenicephaliis cordillercnsis Miller, Journ. Pal., vol. 10, No. i, p. 2>2>i pl- 8, 

 figs. 40, 41, 1936. 



Many of the fossils of this zone are found on w-eathered surfaces. 

 The illustrated example shows several cranidia in various states of 

 preservation and part of a libragene. 



Snowy Range formation; (loc. 37r) Warm Springs Creek, Wind 

 River Range, Wyoming. 



Holotype. — Columbia Univ. No. 12622 ; plesiotype, U.S.N.M. No. 

 108825.' 



TAENICEPHALUS GRANULOSUS, new species 



Plate 20, Figures 4-7 



This moderately large species is covered with rainier large, evenly 

 distributed granules. 



