I 



NO. im CA3IBRIAN FAUNAS OF CHINA— WALCOTT. 593 



in outline, strong-ly convex. Glabella prominent, strong'ly convex, 

 with its .sides converging from a width of 0.5 mm. at the base to 4 

 mm, at the front, in a glabella 6. .5 mm. long, exclusive of the occipital 

 furrow and ring; front arched, with a shallow pit in the dorsal furrow 

 where the sides and front unite; the glabella is marked by three pairs 

 of shallow, rather broad glal)ellar furrows, the posterior pair of which 

 extends obliquely inward and backward about one-third the distance 

 across theglaljella; occipital furrow rounded and rather deep; occipital 

 ring narrow and moderately convex at the sides, gradually increasing- 

 in convexit}' and width toward the center, where a small node occurs; 

 dorsal furrow strong- at the sides and in front of the glabella. 



Fixed cheeks about half as wide as the glabella at its base, convex 

 at the center, and sloping genth^ backward to the posterior furrow 

 and more abruptly downward to the frontal limb; palpebral lobes 

 central and small; ocular ridge rather strong, rounded, and extending 

 from the anterior rim of the palpebral lobe obliquely forward across 

 the tixed cheek to a point just back of the pit at the antero-lateral 

 angle of the glabella; frontal limb of medium width, slightly convex, 

 and passing into the rounded furrow within the rounded, strong, convex 

 frontal rim. 



Surface with prominent, line granulations over the glabella and fixed 

 cheeks, with the exception of the smooth places indicating the glabellar 

 furrows. A head 10..5 mm. in length has a width of 14 mm. at the 

 palpebral lobes. 



(>})i<ervatwns. — In form this species is closel}^ related to Ptychoparla 

 {LuMracuH) thraso Walcott." It differs in having a more convex fixed 

 cheek and frontal rim, and in having a granulated instead of a smooth 

 surface. From Ptychoparia tolus Walcott^ it differs in having a pro- 

 portionally more conical glabella, stronger frontal riiii, and finer 

 granulose surface. 



Formation and locality .—'MaA^^ Cambrian, base of Ch'ang-hia 

 oolite; 2.2^miles southwest of Yen-chuang, Sin-t'ai District, and in 

 upper part of oolitic formation at ('h'au-mi-tien, Shan-tung, China. 



Collected by Eliot Black welder. 



Genus SOLENOPLEURA Angelin. 

 SOLENOPLEURA PAUPERATA, new species. 



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

 sive of the free cheeks and the occijjital ring. The portions preserved 

 show that the head was semicircular, and rather stronglv convex. 

 Glabella truncato-conical, rounded in front, strongly convex, and 

 marked by three pairs of very short, slightly impressed furrows; the 

 fragment of the Qpcipital furrow remaining shows it to have been 



«Proo. y. S. Nat. Mas., XXIX, 1905, p. 85. 6 Idem, p. 82. 



Proc. N. M. vol. XXX— 06 38 



