92 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



Features which make this an average species of the genus include 

 similar glabellar proportions and furrows, narrow convex fixigenes, 

 and brim subdivided into convex preglabellar area and rim of equal 

 width. In dorsal view this species looks like B. affliiis, but in side 

 view, although nearly equally convex in the glabella, it has a brim 

 less convex in its individual parts and as a whole much less down- 

 turned. 



Secret Canyon shale; (loc. 6i) south of the Hamburg Mine, and 

 (loc. 62) north of Adams Hill, Eureka District, Nevada. 



Holotype.—V.S.NM. No. 108788a; paratype, No. 108788b. 



BERKEIA RETUSA, new species 

 Plate 15, Figures 28-30 



This species acquires a peculiar aspect for two reasons. First, the 

 preglabellar area is wider than the rim, and second, the chief distinc- 

 tion lies in the slight swelling of the middle portion of the pre- 

 glabellar area. Glabellar furrows are well developed. Eyes and fixi- 

 genes are of normal size and shape. As stated, the preglabellar area 

 is wide and convex. Longitudinally the cranidium is rather evenly 

 convex, turning down more rapidly in the anterior half. In cross 

 section the glabella and fixigenes are each convex, but taken together 

 are rather flat in profile. The anterior angles and posterolateral limbs 

 are moderately depressed. 



Honey Creek limestone; (loc. i2p) 4 miles southeast of Hennepin, 

 Arbuckle Mountains, Oklahoma. 



Holotype. — U.S.N.M. No. 108789a; paratype. No. 108789b. 



BERKEIA WICHITAENSIS, new species 

 Plate 15, Figures 31-33 



The rather long cranidium has the usual large glabella, in which 

 two pairs of furrows are well defined. The fixigenes average less 

 than a third the glabellar width. The preglabellar area is wider than 

 the rim. In this species the rim expands somewhat to the middle, 

 which together with the more angular anterior margin exaggerates 

 the actual length of the cranidium. 



The small pygidium, tentatively assigned to the species, has a wide 

 axis occupying more than half its length, and flat pleural lobes. As 

 a whole the pygidium is oval in outline. 



Honey Creek limestone; (loc. 91L) Big Baldy, Wichita Mountains, 

 Oklahoma. 



Holotype. — U.S.N.M. No. 108790a ; paratype, No. 108790b. 



