578 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



glabella moderately convex; on each side a broad, shallow furrow 

 indicates that the dividing line between the frontal limb and rim was 

 about half way between the front of the glabella and the frontal mar- 

 gin of the head. 



Surface apparentl}' smooth. The type specimen of the head is 7.5 

 njm. in leiigrh. 



Observations. — This species indicates a type that is best represented 

 b}' Agnmlos (f) me/ieip. 581). it differs from the latter in not having 

 a swollen frontal limb, in the al)sence of ocular ridges, and in having 

 a smaller, flat occipital ring. From Aaraalos dlr! Walcott " this spe- 

 cies differs in the presence of the side furrows delimiting the frontal 

 limb and rim, narrower and more convex tixed cheeks, and less 

 strong!}' marked occipital ring. 



Foi^maUon, and locality. — Middle Cambrian, lower portion of oolitic 

 limestone series; 4 miles east of Fang-lan-chon, Shan-si, China. 



Collected by Eliot Blackwelder. 



AGRAULOS REGULARIS, new species. 



This species is represented by a few specimens of the central portions 

 of the head, exclusive of the free cheeks. These indicate that the head 

 was rather strongly convex, and semicircular in outline. Glabella con- 

 vex, truncato-conical, rounded in front, and with traces of two pairs 

 of short glabellar furrows that divide it into three subequal portions; 

 occipital furrow narrow but clearh' defined; occipital ring narrow at 

 the sides, increasing slightly in width toward the center where it rises 

 to form the base of a small node; dorsal furrow deep and rather broad. 



Fixed cheeks convex, rising abru})tly from the dorsal furrow, the 

 posterior furrow of the head, and from the anterior margin; in front 

 the}" merge into the rounded, convex frontal liml) with a trace of an 

 intervening furrow and narrow ocular ridge; palpebral lobes small, 

 and situated oi^posite the central portion of the glabella. 



Surface, under a strong lens, shows traces of being very finely punc- 

 tate. The average length of three specimens of the head is )1 nnn. 



()1>s,'rratlo)is. — The head repi'csenting this species has the rounded, 

 full fixed cheeks, and frontal limb of A(/r<i>ilos aca/tr Walcott,'' but it 

 differs in having a proportionally shorter and ])roader glabella, and in 

 being broader between the facial sutures. 



F(ir)ii<iti(ni auil local ttij. — IVIiddle Cambrian, Ku-shan shale horizon 

 of the Shan-tung section, in a fossiliferous, brownish-gray limestone; 

 4 miles east of Fang-lan-chon, Shan-si, China. 



Collected bv Eliot Blackwelder. 



«Proc. U. S. Nat. Mus., XXIX, 1905, p. 45. *Idem, p. 43. 



