60 BULLETIN 164, UNITED STATES NATIONAL MUSEUM 



ECCYLIOPTERUS species undetermined 

 Pl^TE 23, FiGUBE 13 



My field work in Manchuria yielded two rather poor specimens 

 of a gastropod (U.S.N.M. No. 836GT) that, from the loosely coiled 

 whorl with the " collar," is referable to Eccyllofterus. 



Description. — ^AVidth of larger specimen, 30 mm ; whorls very flat- 

 tened, enlarging rather rapidly, coiled very nearly in the same plane ; 

 umbilicus comparatively large; collar rather low, but well indi- 

 cated on the upper surface of the whorl. Character of aperture and 

 nature of surface markings not ascertained. 



Formation and locaJity. — Lower Ordovician, Wuting formation: 

 In black banded limestones near the second tunnel, 1 mile north of 

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



Genus HELICOTOMA Salter, 1859 



HELICOTOMA species undetermined 



Plate 26, Figures 7, 8 ; Plate 23, Figxibes 19, 20 



A rather poor specimen (U.S.N.M. No. 83668) of a Helicotoma is, 

 as may be seen in Plate 26, Figures 7 and 8, closely similar to Helico- 

 toma declivis Safford, from the Stones River, in its wide umbilical 

 cavity and the relative depression of the inner whorls as compared 

 with the outer one. But in detail the Manchurian specimen differs 

 in one or two minor features from the American species, namely, in 

 having coarser surface markings and a higher revolving line on the 

 upper surface of the whorl. Since it is so poor, however, no new 

 specific name is assigned. 



Another poor specimen (U.S.N.M. No. 83669) (pi. 23, figs. 19, 

 20) quite different specifically, seems to me also to belong to Helico- 

 toTiia., since it has a wide umbilical depression and a nearly flat spire. 



Fonnation and localities. — Lower Ordovician, Wuting formation : 

 In the black banded limestones on Wu-ting hill 2 miles south of the 

 Yen-tai colliery and near Pen-hsi-hu colliery, Liao-tung, Manchuria. 



Genus MACLURITES Leseur, 1818 



MACLURITES BIGSBYI (Hall) 



Plate 12, Figtjbes 3-8 



18G1. Maclurea higsbyi Hall, Report of the Geological Survey of the State of 

 Wisconsin, p. 37. 



1882. Maclurea higshyi Whitfield, Geology of Wisconsin, vol. 4, p. 222, pi. 6, 

 figs. 17, 18 ; 1895, Mem. Anier. Mus. Nat. Hist. vol. 1, p. 62, pi. 8, figs. 14, 15. 



1897. Maclurea higshyi Ulbich and Scofield, Geology of Minnesota, Paleontol- 

 ogy, vol. 3, pt. 2, p. 1039, pi. 75, figs. 5-10. 



