36 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



DOLICHOMETOPSIS MANSFIELDI, n. sp. 



Plate 6, figs. 11-16 



This species is represented by a number of fragmentary specimens. 

 It is nearest like D. communis in the narrowness of the palpebral 

 lobes. The glabella does not expand very much and the furrows are 

 all shallow, including the occipital furrow. The occipital ring is wide 

 but its spine is slender. The palpebral lobes at their widest point are 

 considerably less than half the glabellar width. The eyes are long, 

 rather straight in the forward part, and more sharply curved to the 

 rear. The libragenes are convex in cross section, but the glabella has 

 little elevation. Longitudinally this species is not so highly convex, 

 as may be seen from the side views. Test is smooth except for 

 striations on the rim. 



Locality 19s. 



Holotype and paratypes. — U.S.N.M. Nos. 985iia-d. 



DOLICHOMETOPSIS POTENS, n. sp. 



Plate 6, figs. 17-23 



This species is represented by fragmentary material only but is 

 quite distinctive because of the great width of the palpebral lobes and 

 the practically smooth test. The glabella expands greatly in the 

 anterior half. The furrows are developed as usual. The palpebral 

 lobes are very wide, equaling nearly two-thirds the glabellar width at 

 the same point. The occipital spine is stout. Anterior to the eyes 

 the fixigenes form only a narrow flange, and the rim is very narrow. 

 Fusion is carried far in the pygidium. The furrows are wide and 

 shallow and the pits large but also shallow. The four marginal spines 

 evidently increase in size rearward and likely are rather large. The 

 peculiar feature of the pygidium is the wrinkling of the test on the 

 higher parts. 



Locality 54s. 



Holotype and paratypes. — U.S.N.M. Nos. 985i2a-e. 



DOLICHOMETOPSIS GRAVIS, n. sp. 

 Plate 7, figs. 6-ti 



This species is represented by several cranidia, and one pygidium 

 has been assigned to it. It is characterized by the usual cranidial fea- 

 tures, the glabella expanding slightly anterior to the eyes, and with 

 four pairs of glabellar furrows, shallow except for the outer ends of 

 the first pair, which are deeply impressed next to the dorsal furrow. 

 This species evidently has a rather slender occipital spine. In cross 



