NO. 24 PTARMIGANIA STRATA RESSER 53 



ALOKISTOCARELLA BRIGHAMENSIS, n. sp. 



Plate 13, figs. 17, 18 



Several nearly complete specimens are in hand. Unfortunately 

 none of them preserve the pygidium. The cranidium is simple in 

 construction, with a tapering glabella, rounded in front. Glabellar 

 furrows are not shown. Brim concave, with a rim delimited in proper 

 light more by means of change of slope than by an anterior furrow. 

 Fixigenes are simple, averaging about two-thirds the glabellar width. 

 Eye lines present. Eyes small, situated somewhat behind the middle 

 of the cranidium. 



The holotype retains about 16 thoracic segments, which is likely 

 close to the total. 



Localities 55e, 20x. 



Holotype and paratype. — -U.S.N.M. Nos. 98549, 98548. 



KOCHINA Resser, 1935 



KOCHINA VENUSTA, n. sp. 



Plate 6, figs, g, 10 



This species is based on a cranidium that seems to be fully typical 

 of Kochina. The glabella tapers and attains a length of a little more 

 than half the cranidium. Three pairs of furrows are visible, and the 

 occipital ring bears a small node. In cross section the cranidium is 

 rather flat across the palpebral lobes but becomes quite convex in 

 front. Longitudinally there is little curvature except in the brim. The 

 fixigenes average about three-fourths the glabellar width. Eye lines 

 present. Eyes of normal size, situated just behind the midpoint of the 

 glabella. Brim wide, with a wide rim that expands in the middle. 

 Surface finely granulose, overlain by scattered larger granules on the 

 glabella and fixigenes, and by vertical lines on the preglabellar area. 



Locality 54s. 



Holotype.— U.S.N.M. No. 98550. 



KOCHINA VESTITA, n. sp. 

 Plate 12, figs. 7, 8 



This beautiful cranidium is unique. The glabella has the usual 

 shape and proportions and three pairs of shallow furrows are trace- 

 able. The occipital furrow is deep and wide and expands forward 

 in the middle nearly to the backward-directed first pair of glabellar 

 furrows. The occipital ring bears a small tubercle. The fixigenes are 

 about three-fourths as wide as the glabella at the forward end of the 



