90 SMITHSONIAN M ISCELI.ANEOUS COLLECTIONS VOL. IO3 



upon close examination it appears to be merely a simplification of 

 the regular Iddingsia features. 



The fairly large glabella has two pairs of faint furrows. The 

 expanded neck ring, separated from the glabella by a strong furrow, 

 carries a large spine in an elevated position. Although in the posterior 

 position of the genus Iddingsia, the eyes are sufficiently removed from 

 the occipital furrow to leave a small gap. Measuring along the con- 

 tours of the brim, its width equals the length of the glabella exclusive 

 of the neck ring. A median boss is developed in the convex pre- 

 glabellar area, thus accentuating the variant aspect of the species. A 

 change in contour alone marks the position of the anterior furrow, 

 In different light directions this concavity shifts its position, causing 

 the rim to appear relatively wider or narrower than the preglabellar 

 area. The fairly large libragene has a moderately convex ocular plat- 

 form. The suture is intramarginal for a considerable distance. A 

 swelling beginning in the rear portion of the rim and the outer corner 

 of the ocular platform, continues into the long genal spine which is 

 in a horizontal position, thus having a conisderable upward and out- 

 ward course from the ocular platform. 



Honey Creek limestone; (loc. Sgy) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



Holotype. — U.S.N.M. No. 108804a: paratypes. Nos. io88o4b-d. 



BERKEIA Resser, 1937 



BERKEIA COMES, new species 



Plate 15, Figures 18-21 



Although several cranidia are available, the pygidium has not been 

 determined. 



All of the cranidia are exfoliated, and therefore the furrows appear 

 much deeper than on the exterior of the test. The large glabella is 

 well rounded in front. Because of the enlargement of the dorsal 

 furrow the glabella appears to be restricted posterior to the rear pair 

 of glabellar furrows. Three pairs of recurved furrows are clearly 

 impressed. The swollen occipital ring is elevated and carries a short 

 spine. Ilie brim width is about one-fourth the glabellar length. In 

 dorsal view it appears to be divided almost equally between the pre- 

 glabellar area and the rim, but in side view the rim seems to be 

 relatively narrower. This subdivision is attained by a change in slope 

 between the somewhat convex preglabellar area and the slightly 

 thickened rim, turned up a little above the horizontal position. Oppo- 

 site the eyes the fixigenes equal one-third the glabellar width. Owing 



