46 BULLETIN 16 4, UNITED STATES NATIONAL MUSEUM 



Form<jition and locality. — ^Lower Ordovician, Wuting formation: 

 In the black banded limestone in the vicinity of Hsiao-shih and the 

 Wu-hu-tsui coal field, Liao-tung, Manchuria. 



Genus PLAYFAIRIA Reed, 1917 



PLAYFAIRIA cf, DELTOffiEA (Conrad) 



Plate 11, Figure 4-6. 



1S39. Strophomena deltoidea Conbad, 3d Ann. Rep. New York Geol. Surv., p. 64. 

 3S92. Raflnesquiyia deltoidea Hall and Clabke, Palaeontology of New York, 



vol. S, pt. 1, pi. 9A, figs. 1, 2, 4. 

 1917. Rafinesqui>ia [Playfairia) deltoidea Reed, Trans. Roy. See. Edinburgh, 



vol. 51, pt. 4, p. 866, pi. 11, figs. 21-30. 

 1920. Raflnesquina deltoidea Foekste, Bull. Sci. Lab. Denison Univ., vol. 19, 



no. 3, p. 200, pi. 21, figs. 2, 3 ; pi. 22, figs. 2, 3. 



A single pedicle valve of a brachiopod, which I collected in Man- 

 churia, is closely related to Playfairia deltoidea from the Trenton 

 formation at Jacksonburg, N. Y., as may be seen from Figures 4 and 

 5 of Plate 11. The Manchurian specimen is 23 mm wide and about 

 27 mm long, and has a convexity of 8 mm. 



In comparing the Manchurian specimen (U.S.N.M, No. 83640) 

 with one figured by Foerste in 1920, I find no differences, and I 

 therefore assume that the Manchurian form may be the same 

 species. I hesitate, however, to say definitely that they are identi- 

 cal, because the Manchurian specimen is the only one found and 

 occurs at a locality so very remote from North America. In view 

 of this fact, I tentatively refer it to Conrad's species, hoping to get 

 better specimens later. 



Formation and locality. — Middle Ordovician, Ssuyen formation : 

 Lower fossil horizon in the black banded limestones just north of 

 the Pen-hsi-hu colliery, Liao-tung. 



Genus PTYCHOGLYPTUS Willard, 1928 



PTYCHOGLYPTUS ULRICHI, new 8p«cie8 



Plate 35, Figures 1-6 



Among the material collected by George D. Louderback from 

 Shensi, China, are a number of very fine brachiopods, which, from 

 the general form of the shell and very fine and numerous transverse 

 rugae, are referable to the genus Ptychoglyptus. 



DescHption. — Shell comparatively small, semicircular to subsemi- 

 circular, almost flat, widest at the hinge, nearly two-thirds as long 

 as wide. Surface of valves marked with 11 to 15 fine straight pri- 

 mary radii, equidistant and of equal strength, separated by wide 

 fiat interspaces. At half or four-fifths the length and midway be- 

 tween the primaries an almost equally strong but shorter secondary 



