FORMATIONS AND FOSSILS OF SOUTH MANOHURIA 111 



directly transverse for about half of the distance from the dorsal 

 furrow to the general angle, then curving backward. Surface of the 

 glabella and of the fixed cheeks marked by minute pits as shown 

 under the magnifying lens. 



Comparisons. — In general this species may be compared with 

 Cryptolithus tessellatus Green from the Trenton-Maysville group, 

 N'orth America, but differs from it in having many rows of rather 

 even-sized, small pits on the brim. 



Formation and locality. — Upper Ordovician: Near Huang-pa-yi, 

 Shensi, China. 



Holotype.—U.^.'^M. No. 83T64. 



CRYPTOLITHUS WELLERI, new species 



Plate 39, Figure 3-8 



Louderback's central China material contains a number of heads 

 representing another Gryptolithus. 



Description. — Brim of cephalon with 2 rows of pits anterior to the 

 middle of the cephalon, 6 rows at the anterolateral part and 8 rows 

 at the lateral sides of the cheeks. Pits forming the 2 or 3 outer rows 

 of the brim conspicuously larger, and the first 2 or 3 inner rows are 

 arranged along radii centering at the posterior end of the glabella. 

 The remaining pits alternate more or less distinctly. The general 

 shape of the glabella and the cheeks of this species causes it to resem- 

 ble G. multiseriatus., but it has three rather distinct glabellar furrows 

 on the lateral sides of the glabella, while G . multisenatus shows very 

 slight traces of any. The surface of the glabella and cheeks is seen 

 under magnifying lens to be pitted. 



Form^ation and locality. — Upper Ordovician, near Chien-ko-hsien 

 and Chao-hua, Szechwan, China. 



Cotypes.—T].^.'^M. Nos. 83765 and 83Y66. 



Genus MEGALASPIS Angelin, 1878 



MEGALASPIS INSCULPTA, new species 



Plate 39, Fiq-ubes 18-20 



Description. — This species is based upon several pygidia, which are 

 triangular in shape, with a rather convex axis. This axis is marked 

 by 5 anterior and 4 or 5 very faint, shallow posterior furrows that 

 divide the axis into 6 comparatively well-defined rings, and a rather 

 long terminal section. The dorsal furrow is clearly defined. 



Pleural lobes broad, rather convex, with a broad panulate margin. 

 Seven well-marked anterior segments and two posterior fainter ones 

 are outlined on the pleural lobes by furrows that curve backward and 

 terminate on the inner margin of the doublure. 



