594 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



narrow and rather deep; occipital ring unknown; dorsal furrow narrow 

 and rather deej:) at the sides, and clearh^ defined in front of the glabella. 



Fixed cheeks about two-thirds the width of the glabella, convex, and 

 curving gently to the front and back: palpebral lobes central and 

 small: no ti-aces of ocular ridges; postero-lateral limb about as long 

 as the width of the gla>)ella, and marked by a sharply impressed furrow 

 within a nai'row. rounded posterior rim; the line of demarcation 

 between the front of the glabella and the frontal rim is a rather deep, 

 narrow furi'ow, no traces of a frontal limb being present: frontal rim 

 strong, rounded, and broadh' curved in front. 



Surface minutely granular, with a few larger granules scattered over 

 the surface of the glahella, and a iuunl)er of slightly larger granules 

 scattered over the surface of the lixed cheeks. The type and only 

 specimen of the head has a length of 3 mm., exclusive of the occipital 



Oh^ervations. — This species is characterized l)v the absence of a 

 frontal liml). and its broadly conical glabella, in these respects differ- 

 ing from Soloioplexra agno Walcott " and .*n. hcroe Walcott.* It also 

 dilfers from the two mentioned species by having a more finely granu- 

 lated surface. 



Format Ion and locality. — Middle Cambrian: 4 miles south-southwest 

 of Tung-yii-chon, Shen-si, China. 



Collected by Eliot Blackwelder. 



Genus DOLICHOMETOPUS Angelin. 

 DOLICHOMETOPUS HYRIE, new species. • 



This species is represented by a single specimen of the central por- 

 tions of the head, and an associated free cheek and pygidium. Gla- 

 bella moderately convex, with the sides slightly converging toward the 

 broadly rounded front; glabellar furrows faintly impressed; the pos- 

 terior pair extends obliquely inward and backward. ol)scurely outlining 

 a subtriangular lobe on each side; also two pairs of short, faintl}' 

 impressed furrows that extend in at nearly right angles to the sides 

 of the glabella: occipital furrow shallow, somewhat deeper at the 

 sides than in the center: occipital ring narrow at the sides, widening 

 gradually toward the center where it is of medium width, slightly* 

 convex, and rising l)ut little above the general surface of the glabella: 

 dorsal furrow shallow, indicated ))v the union of the sloping sides and 

 front of the glabella with the fixed cheeks and frontal limb. 



Fixed cheeks narrow, nearly fiat opposite the palpe))ral lobes, and 

 sloping gently to the front and ))ack; what is preserved of the palpe- 

 bral lobes indicates that thej' were elongate, extending about one-third 

 or more. of the length of the head; a narrow, slighth' elevated ocular 



" Proc. U. S. Nat. Mus.,XXIX, 1905, p. 89. '' Idem, p. 91. 



