110 BULLETIN 164, UNITED STATES NATIONAL MUSEUM 



Formation and locality. — Ordovician : Near Huanir-pa-yi, Sliensi, 

 China. 



UoJotype.—\j.^.'S.'M. No. 83761. 



Genus BATHYURUS Billings, 1859 



BATHYURUS(?) species undetermined 



Plate 39, Figure 1 



A single small cranidium (U.S.N.M. No. 83762) is found in 

 Louderback's collection from near Huang-jDa-yi, Shensi, that is 

 apparently referable to Bathyui'us^ although I have some doubt as 

 to the validity of this reference. 



Desciiption. — Cephalon semicircular, convex; glabella rounded 

 triangular, strongly convex, without noticeable traces of glabellar 

 furrows; dorsal and occipital furrows very distinct; palpebral lobes 

 and eye lines distinct. Fixed cheeks are rather broad and the rim 

 is narrow. Under a strong lens, the surface of the specimen is 

 shown to be minutely pitted. 



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

 China. 



BATHYURUS (?) species undetermined 



Plate 26, Figure 1 



A single poorly preserved pygidium (U.S.N.M. No. 83763), found 

 in the strata of the Wuting formation, has the general features of 

 a Bathyurus. The specimen has a rather broad, convex axial lobe 

 and gently convex pleural lobes which are divided by about five 

 furrows into about five segments, exclusive of the terminal one. 



Formation and locality. — Lower Ordovician, Wuting formation: 

 In the black banded limestone, near the second tunnel, 1 mile north 

 of Pen-hsi-hu, Liao-tung, Manchuria. 



Genus CRYPTOLITHUS Greexi 1832 



CRYPTOLITHUS MULTISERIATUS. new species 



Plate 39, Figure 2 



Description. — Brim of cephalon with 6 or 7 rows of pits anterior 

 to the fixed cheek of the cephalon, and with 11 or 12 rows antero- 

 lateral to the lateral part of the fixed cheek. Pits enlarge very grad- 

 ually from the center to the outer margin of the brim and about the 

 half rows of the inner pits, tending to a radial arrangement, with the 

 posterior end of the glabella at the center of the radii. The remain- 

 ing outer pits alternate more or less definitely. Glabella obovate, 

 strongly bulbous convex, especially anterioi'ly where it rises almost 

 1.2 mm above the rim. Posterior margin of the cephalon almost 



