114 BULLETIX 1G4, UNITED STATES NATIONAL MUSEUM 



Genus CALYMENE Brongniart, 1822 



CALYMENE(?) species undetermined 



I'l.ATK :?;•. FlCntK '.) 



A single poorly preserved cranidium (U.S.N.M. No. 83771) is con- 

 tained in Louderback's collection from central China. It may be 

 referable to Cdlymene since it has a convex, conical glabella; three 

 pairs of the glabellar furrows, the posterior one deep and prominent; 

 and a well-defined occipital furrow. Even though this apparently 

 represents an undescribed species, since the specimen is so poor I 

 hesitate to assign an exact generic designation or to give a new 

 specific name. 



Cephalon convex, fixed cheeks, occipital ring, and posterior border 

 rather broad ; facial sutures curving strongly outward. The surface 

 of the specimen under the strong lens is shown to be marked by 

 rather scanty pustules. 



Formation and locality. — ^Upper Ordovician, near Chao-hua, 

 Szechwan, China. 



Undetermined Trilobite 



Plate 3G, Figure 14 



A single pygidium (U.S.N.M. No. 83772) has a rather convex 

 axial lobe divided by about six transverse furrows into about six 

 segments and a terminal section. The axial segments continue out on 

 the pleural lobes to where they merge into the border. 



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

 China. 



Undetermined Trilobites 



Plate 30, Figxire 11 ; Plate 26, Figures 2-6 



Several small and poorly preserved pygidia belonging to different 

 genera occur in the limestones of the Wuting formation. Since all 

 these specimens are too poor to be given any special names, I describe 

 them here as undetermined species, hoping to get more and better 

 specimens in future field work. 



The specimen illustrated in Plate 30, Figure 11 (U.S.N.M. No. 

 83773), is convex, subsemicircular in outline, and strongly trilobed, 

 without a planulated margin. Axial lobe convex, divided by four 

 transverse furrows into four rings and a small terminal section. 

 Pleural lobes convex ; furrows and segments of the axis extended into 

 the margin toward the back on the surfaces of the pleural lobes. 

 Under a strong leas the surface is seen to be densely marked by the 

 pustules. 



Formation and locality. — Lower Ordovician, Kangyao formation : 

 In the black banded limestone west of Shang-kang-yao, 3 miles south- 

 east of Yen-tai colliery, Liao-tung, Manchuria. 



