92 PROCEEDINaS OF THE NATIONAL MUSEUM. vol. xxix. 



DIKELOCEPHALUS (?) BRIZO, new species. 



This species is represented by the anterior portions of a large, 

 moderately convex head, exclusive of the free cheeks. The glabella 

 is subquadrilateral, with the sides slightly incurv^ed and the front 

 nearly transverse; it is marked by a sti'ong pair of posterior furrows 

 that penetrate obliquely backward nearly to the median line; a second 

 pair incline slightly backward and penetrate to about one-third the 

 distance across; a third pair, narrow and very slightly impressed, 

 extend in at right angles to the sides a little less than one-third the 

 distance; occipital furrow well defined, with a slight, elongate, pit-like 

 depression at the anterior lateral angles of the gla})ella. 



Fixed cheeks very narrow, not much more than a ridge opposite 

 the palpebral lobes; palpebral lobes unknown; ocular ridge rounded, 

 and dividing the fixed cheek into the flat posterior portion and the rather 

 rapidly sloping frontal portion that passes down into the concave 

 frontal limb; frontal limb short, concave, and bordered b}' a rounded, 

 thick, fi'ontal rim. The fragmeiitary specimens representing this 

 species indicate a length for the glabella of 22 mm., with a width in 

 front of 14 mm.; the concave fiontal limb has a length of 2.5 mm., 

 and the thickened, rounded rim has a length of about 1.5 mm. The 

 fixed cheek at the palpebral lobe has a width of 2 mm. 



Surface marked by numerous more or less irregularly placed strong 

 pustules, except in the dorsal furrow and the concave frontal limb. 

 This species is somewhat doubtfully referred to Dlhelocejjhalus. The 

 form of the glabella, frontal rim, and narrow fixed cheeks suggest 

 D'd'eJocephcdns^ ])ut the strongl}' pustulose surface is not character- 

 istic of the typical forms of the genus. 



Formation and locality. — Upper Cambrian, lower portion of the 

 Chao Mi Tien formation, in coar.se, gra}', fossiliferous limestone; 

 Chao Mi Tien, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



Genus CREPICEPH ALUS Owen. 

 CREPICEPHALUS DAMIA, new species. 



Head semicircular in outline, with the postero-lateral angles termi- 

 nating in round, somewhat incurved, spines. Glabella moderately 

 convex, with the sides narrowing slightly toward the front, which is 

 broadl}^ rounded; length a little greater than its width at the occipital 

 furrow; marked by three pairs of furrows; posterior pair extend 

 o])liquely inward and backward so as to almost separate a triangularh' 

 shaped lobe; second pair rather faint, extending directl}- inward a dis- 

 tance of about one-third the width of the glabella, and then curving 

 slightly backward; anterior pair very faint; occipital furrow rather 



