580 PROCEEDINGS OF THE NATIONAL MUSEUM. 



(p. 579). It differs widely from A. (f) eaj?ax and less so from A. uta 

 in its narrow, conical gla))ella. and the form of its frontal limb. 



Formation and locality. — Middle Cambrian, in a brown, oolitic lime- 

 stone, near the base of the Ki-chou limestone, corresponding to the 

 lower portion of the Ch'ang-hia limestone; \ miles soutli-southwest of 

 Tung-3^u-chon, Shen-si, China. 



Collected b}' Eliot Blackwelder. 



AGRAULOS (?) CAPAX, new species. 



As indicated ])y the central portions of the head, exclusive of the 

 free cheeks, the head of this species is semicircular in outline, and 

 moderately convex. The glabella narrows slightly from the base tt) 

 its rounded front, which springs from the point where the ocular 

 ridges pass into the dorsal furrow; the surface of the glabella is 

 marked by three pairs of short, slighth' impressed gkbellar furrows 

 that divide the glabella into a posterior, subtriangular lobe, two nar- 

 row lobes, and a larger, front terminal lobe; occipital furrow rounded, 

 not very deep, and slightly wider at the sides than in the center; 

 occipital ring narrow at the sides, widening toward the center where 

 there is a low, small node near the posterior margin; dorsal furrow 

 narrow, deep in front, and shallow at the sides of the glabella. 



Fixed cheeks broad, rising gently from the dorsal furrow to the pal- 

 pebral lo])es; thev slope gradually to the posterior furrow, and, in 

 front of the ocular ridges, rather rapidly to the broad furrow defining 

 the frontal limb; palpel)ral lo])e small, narrow, and passing in front 

 into a narrow ocular ridge, which crosses the fixed cheek to the antero- 

 lateral angle of the glabella; frontal limb separated from the glabella 

 b}' a narrow, deep furrow, whit-li widens out on each side; the limb i.s 

 strongiv convex immediately in front of the glabella, where it rises 

 on some examples into a transverse boss; in other specimens it is not 

 much higher than the general elevation of the glabella. 



Surface finel}' punctate under a strong lens. Tiie head of the largest 

 specimen in the collection has a length of T nun., with a width of 12 mm. 

 at the palpe))ral lobes. 



Ohscrcdtiohs. — This species, at first sight, might be taken for a 

 broad form of A(/r(nil()f<{.'') inctle (p. 581), but on closer examination it is 

 seen that the glabella is nearly rectangular instead of truncato- 

 conical, the fixed cheeks are more than twice the width, and glabelhi 

 narrower, in specimens of the same size. The ocular ridges of ^4. {?) 

 capax are also unlike those of .1. {?) melle. 



ForniQtion and load it y. — Middle Cambrian, in a l)rown, oolitic 

 limestone, near the base of the Ki-chou limestone, corresponding 

 to the lowei- portion of th(> Ch'ang-hia limestone; 4 miles south- 

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



Collected bv Eliot Blackwelder. 



