44 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



AGRAULOS AGENOR, new species. 



Glabella sliojitl}^ truncato-conical, .strongly convex; occipital furrow 

 rounded, clearly defined; occipital ring slightly convex, subtriangular 

 in outline, narrow at the sides and broadening out to an obtuse spine 

 behind; dorsal furrow narrow and clearly defined. 



Fixed cheeks about one-half the width of the glabella, convex, 

 rising from the dorsal furrow and arching down to a small palpebral 

 lobe; the fixed cheeks slope rapidly backward to a short postero- 

 lateral limb, and anteriorly to a rather broad, very slightl}^ convex 

 frontal liml); a rather deep, narrow furrow occurs within the elevated 

 margin of the postero-lateral limb. 



Surface minutely punctate under a strong magnifier, the punctae 

 formed apparently by an irregular network of elevated lines. The 

 only specimen of the head representing this species has a length of 

 2.5 mm. 



Formation and locality. — Middle Cambrian, Chang Hsia formation, 

 about 50 feet below the Ku San formation, in conglomeratoid lime- 

 stone. Chang Hsia, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



AGRAULOS DIRGE, new species. 



This species is represented by the central portions of the head, 

 exclusive of the fixed cheeks. The surface is depressed, convex, with 

 the glabella rising but little above the general surface at the front, and 

 but moderately convex at the base. 



Glabella truncato-conical, indistinctly defined from the frontal rim 

 and at its base from the occipital ring; without traces of furrows; 

 occipital furrow indicated only by the very slight convexity of the 

 occipital ring. 



Fixed cheeks about three-fourths of the width of the glabella; pos- 

 teriorly they merge into the short postero-lateral limbs and toward 

 the front into the broad, gently convex, frontal limb, which continues 

 uninterruptedly to the anterior margin of the head; palpebral lobes 

 small; ocular ridges indicated by a dropping down of the fixed cheek 

 at the place where the ridges usually occur. 



This species recalls the general form of Agraulos strenuus Billings; 

 it diflers in being less convex, in its broader fixed cheek and short 

 occipital ring. It also difi'ers in its wider fixed cheeks from Agraulos 

 dolon, which occurs at about the same geologic horizon. 



The largest head in the collection has a length of 11 mm. and the 

 same width at the palpebral lobes. 



