DESCRIPTION OF GENERA AND SPECIES. 153 



lobe; a second pair of short, lightly defined furrows occurs about one-third the 

 distance between the posterior furrows and the front of the glabella; occipital 

 furrow rather broad and shallow toward the center, narrower and deeper at the 

 sides; occipital ring narrow at the sides, increasing in width toward the center, 

 where it is rather broad and slightly convex; dorsal furrow clearly defined at the 

 sides and front of the glabella. 



Fixed cheeks about one-third the width of the glabella, convex, rising from the 

 dorsal furrow and curving over to the facial sutures and the furrows separating them 

 from the palpebral lobes; palpebral lobes narrow, slightly elevated, and about 

 one-third the length of the cephalon ; palpebral ridges indicated more by the depres- 

 sions in front of them than by their elevation above the general surface of the fixed 

 cheeks; postero-lateral limb short, and marked by a broad, shallow furrow within 

 the strong, rounded posterior rim; frontal limb convex, inflated at the center so 

 as to form an elongate swelling somewhat similar to that of Inouyia melie the 

 line of demarcation between the fixed cheeks and the frontal limb is rather indefi- 

 nite, the fixed cheeks merging into the downward sloping surface of the frontal limb ; 

 there is no line of demarcation to indicate a distinct frontal rim. 



Surface smooth to the unaided eye, and under a strong lens slightly roughened 

 with what appear to be irregular, inosculating, very slightly elevated lines, and a 

 few low, scattered tubercles. The type and largest specimen of the cephalon has 

 a length of 9 mm. 



This species at first suggests Inouyia melie owing to the swelling on the frontal 

 limb; the glabella, however, is much broader in proportion to its length, and its 

 furrows are those of Ptychoparia rather than Agrcmlos. 



Formation and Locality. Middle Cambrian: (C69) Limestone in shales about 

 65 feet (19.5 m.) above the base of the Ki-chou limestone [Willis and Blackwelder, 

 1907, p. 145 (first list of fossils)], 4 miles (6.4 km.) east of Fang-lan-chon, Shan-si, 

 China. 



Collected by Eliot Blackwelder. 



Inouyia melie (Walcott). 

 Plate 14, Figures 12, 120. 



Agrcmlos (?) melie WALCOTT, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 581 . (Species described essen- 

 tially as below.) 



Central portions of cephalon, exclusive of the free cheeks, convex. Glabella 

 truncato-conical, convex, about one-half the length of the cephalon, and marked 

 by three pairs of short, faintly impressed glabellar furrows, and a narrow, median, 

 longitudinal ridge; occipital furrow transverse, rounded, shallow, and fading out 

 toward the center of the glabella; occipital segment narrow at the sides, widening 

 rapidly to the central portion, which is as high as the glabella at the back, and sloping 

 toward the occipital furrow at the base of the glabella ; a minute node occurs at the 

 center of the segment ; dorsal furrow shallow, but strongly outlined. 



Fixed cheeks narrow, elevated at the palpebral lobes, and sloping toward the 

 glabella; a narrow ridge extends from the anterior outer edge of the furrow on the 

 inner side of the palpebral lobe to the furrow in front of the antero-lateral angle of 

 the glabella, which corresponds to the palpebral ridge ; palpebral lobe long, narrow, 

 and separated from the fixed cheek by a narrow furrow; frontal limb convex, rising 

 to a prominent boss or swelling in front of the glabella, from which it is separated 

 by a strong furrow; at the sides the frontal limb is narrow and merged into the 

 narrow, fixed cheeks; postero-lateral limbs short, narrow, and separated from the 

 fixed cheeks by a narrow, shallow furrow. 



