I 



NO. 5 UPPER CAMBRIAN TRILOBITES RESSER IO7 



with T. holmesi, the palpebral lobes are less prominent because the 

 fixigenes are less sharply bowed at that point. 



Snowy Range formation ; head of Buffalo Fork, west side of Big 

 Horn Mountains, Wyoming. 



Holotype and paratypes.—lJ.S.'NM. No. 11593. 



TALBOTINA Lochman, 1938 



TALBOTINA CANDIDA, new species 



Plate 21, Figures 27, 28 



The glabella covers somewhat less than half the cranidial area and 

 is sculptured Ijv three sets of recurved furrows and a deep, wide 

 occipital iurvow. The fixigenes average about half the glabellar width. 

 Posterolateral limbs are fairly long and of normal width. The brim, 

 about equal in width to the fixigenes, is separated into rim and pre- 

 glabellar area. The somewhat swollen rim widens to the center, chiefly 

 by rather sudden expansion rearward. The eyes, of average size, are 

 situated behind the midpoint of the glabella. Eye Hues present. Con- 

 vexity is about average in amount, while the relief is pronounced. The 

 surface is abundantly granulose. Libragene, thorax, and pygidium 

 unknown. 



Wilberns formation; (loc. 14b) Cold Creek, opposite north end of 

 Sponge Mountain, Texas. 



Holotype— U.S.N. M. No. 108841. 



TALBOTINA ULRICHI, new species 



Plate 21, Figure 26 



A second species from Texas is characterized by being shorter and 

 by the glabella in consequence occupying a relatively greater pro- 

 portion of the cranidium. The anterior furrow also has a more even 

 course near the center, although the rim remains proportionally about 

 the same as in T. Candida. The surface is nearly smooth. 



Wilberns formation; (loc. 14b) Cold Creek, opposite north end of 

 Sponge Mountain, Texas. 



Holotype.— U.S.lsi.M. No. 108840. 



TALBOTINA CAELATA, new species 

 Plate 10, Figure 4 



When the fauna from the locality was described, this cranidium was 

 overlooked. T. caclata is a beautifully sculptured trilobite of medium 

 size. It differs essentially from the genotype in its narrowness. 



