138 RESEARCH IN CHINA. 



This genus, as pointed out by Brogger, occupies an intermediate position between 

 forms referred to Dikelocephalus and Ptychoparia (Conocephalites as used by 

 Brogger) . He refers to Conokephalina, Dikelocephalus osceola Hall, D. misa Hall, and 

 D. spiniger Hall. I now refer D. misa to Conokephalina, but D. osceola and D. 

 spiniger will be placed under genera that will soon be described and illustrated in 

 connection with a paper on the genus Dikelocephalus and allied genera. 



Conocephalites emmrichi Barrande appears to belong to this genus and as entire 

 specimens of the dorsal shield are known it is illustrated on plate 13, figures 7, ja. 



Among the fragmentary forms from China, six appear to come within the limits 

 of the genus, as far as may be determined by having only the cranidium for 

 comparison. 



Conokephalina is characterized by its elongate palpebral lobes, narrow free 

 cheeks, and elongate glabella narrowing more or less slightly toward the broadly 

 rounded front. 



The Chinese species referred to it are: C. belus (Walcott), C. ? dryope (Wal- 

 cott), C. maia (Walcott), C. vesta (Walcott), and C. sp. undt. (Walcott). 



Conokephalina belus (Walcott). 

 Plate 13, Figures 12, 120. 



Solenopleura belus WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 90. (Described as a new 

 species essentially as below.) 



This species is represented by a fragment of the cephalon that includes the 

 glabella and fixed cheeks. The glabella is moderately convex and narrows slightly 

 toward the rather broadly rounded front; the surface is marked by a pair of short, 

 oblique posterior furrows and one anterior pair at about the anterior third; occipital 

 furrow narrow, distinct, arching forward at the center, and considerably deeper 

 toward the end ; occipital ring clearly defined ; of moderate width, and slightly con- 

 vex; dorsal furrow narrow and clearly defined. 



Fixed cheeks narrow, scarcely more than a ridge between the dorsal furrow and 

 the palpebral lobe; posteriorly they slope downward to a long postero-lateral limb, 

 and anteriorly drop rather rapidly to the frontal limb ; palpebral lobe a little more 

 than one-third the length of the glabella in front, deeply grooved along its center 

 by a furrow parallel to the elevated posterior margin ; frontal limb short and slightly 

 convex in front of the glabella; it passes into a shallow furrow within a slightly 

 rounded frontal rim ; the latter is broken away except at the ends. 



Surface marked by numerous, scattered, rather small pustules. 



Length of cephalon, 6 mm., with a width at the palpebral lobes of 5 mm. 



This species at first suggests Solenopleura agno [p. 167], but differs from that 

 and other species from China in its very narrow fixed cheeks and relatively large 

 palpebral lobes. 



Formation and Locality. Upper Cambrian: (C5fi) Lower part of Ch'au-mi-tien 

 limestone, 25 feet (7.5 m.) below the top of Pagoda Hill [Blackwelder, 19070, p. 42 

 (part of last list of fossils)], i mile (1.6 km.) west of Tsi-nan, Shan-tung, China. 



Collected by Eliot Blackwelder and Li San. 



Conokephalina dryope (Walcott). 

 Plate 13, Figures n, na-b. 



Ptychoparia dryope WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 78. (Species discussed 

 essentially as below.) 



The cephalon representing this species is somewhat of the same type as that 

 of Inouyia titiana [plate 14, fig. 9] from the base of the Ch'ang-hia limestone. 



