88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



nearly one and one-half times as wide as the preglabellar area. Eyes 

 are strongly bowed and situated just in front of the occipital furrow. 

 At the anterior end of the eye the fixigenes are less than half the 

 glabellar width. In cross section this species has little relief. The 

 glabella rises to a rounded median angle and the fixigenes rise without 

 curvature to the palpebral lobes. Longitudinally the glabella is gently 

 curved, increasing its declivity near the front, while the slightly con- 

 cave brim slopes less. The anterior angles are moderately depressed, 

 but the elevated palpebral lobes accentuate the steepness of the slopes 

 of the anterior fixigenes immediately forward of the eye lines. 



Davis formation; (loc. iik) Federal Lead Mine No. 4, Flat River, 

 Missouri. 



Holotypc— U.S.N. M. No. 108800. 



IDDINGSIA ALPERSENSIS, new species 

 Plate 16, Figures 33-38 



The glabella is rounded in front and practically without furrows. 

 The brim width is about half the length of the glabella including the 

 thickened neck ring, which carries a long spine. Because of the 

 circular anterior outline of the cranidium and the comparatively much 

 less curved anterior furrow, the rim widens appreciably toward the 

 center, where its width is about equal to the preglabellar area. At 

 the anterior end of the eye the fixigene is about one-third the glabellar 

 width. In this species the eyes are not so strongly bowed, nor do they 

 extend back to the occipital furrow. As a whole the cranidium has 

 considerable convexity. In the rear the glabella stands high above the 

 dorsal furrow, but this relationship decreases anteriorly. Thus a 

 forward slope of the whole is created, which is continued by tlie 

 convex preglabellar area. The wide flat rim rises somewhat above a 

 horizontal position. A slight rise brings the fixigenes up to the 

 palpebral lobes. Anterior angles depressed. Preglabellar area marked 

 by strong anastomosing lines. 



Honey Creek limestone; (loc. I2p) 4 miles east of Alpers, Arbuckle 

 Mountains, Oklahoma. 



Holotype. — U.S.N.M. No. 108801a ; paratypes, Nos. 108811b, c. 



IDDINGSIA (?) QUINNENSIS, new species 

 Plate 16, Figures 39-41 



At first glance this cranidium seems to be far removed from 

 Iddingsia. However, when its features are examined individually, 

 each feature fits Iddingsia more closely than any other genus. In other 



