52 BULLETIN 16 4, UNITED STATES NATIONAL MUSEUM 



specimen attains a largest diameter on the upper suface of 35 mm; 

 the width of the aperture is 12 mm, that of the next adjoining whorl 

 6 mm, while the specimen is 11 mm high at the aperture. 



Forynatioti and localities. — Lower Ordovician, Wuting formation: 

 In the sandy limestones on the top of Wu-ting hill, 3 miles south of 

 the Yen-tai colliery, Liao-tung. In the same beds in the vicinity of 

 the Pen-hsi-hu colliery and Yung-ning-cheng, 4 miles east of Pen- 

 hsi-hu, Liao-tung. It also occurs in the black banded limestone near 

 Hsia-kang-yao, 3.5 miles southeast of the Yen-tai colliery, Liao-tung. 



Genus LOPHOSPIRA Whitfield, 1886 



LOPHOSPIRA AOJII, new species 



Plate 28, Figures 1-3, 12, 13 ; Plate 29, Figure 1 



Description. — Height, 12.5 to 20.5 mm; apical angle, about 55°. 

 Volutions about five (uppermost parts of specimens are somewhat 

 broken); periphery trilineate, very prominent; upper slope, with- 

 out carina, nearly flat or very gently concave, lower side decidedly 

 concave; lower carina distinct although not prominent. Surface 

 markings are well preserved and curve strongly backward to the 

 peripheral band. Aperture quadrilateral, diagonally elongated, 

 umbilicus apparently closed. 



The specific name is given in honor of O. Aoji, of the Tahoku 

 Imperial University in Japan. 



Comjyarisons. — This species may be closely allied to L. pulchelli- 

 foTTnis Grabau, the Chinese species from the Machiakou limestone, 

 but the narrower apical angle and more feeble lower carina serve 

 in distinguishing it. 



Formation and locality. — Kangyao formation: In the black 

 banded limestones in the vicinity of Shang-kang-yao, 3 miles south 

 of the Yen-tai collierj^, Liao-tung. 



Cotypes.—V.^.'^M. No. 83652. 



LOPHOSPIRA GRABAUI. new species 



Plate 28, Figures 4, 5 



Description. — Height, 10 to 15 mm; apical angle, about 80". 

 Volutions five, the last very large, the whorls extending to the pe- 

 ripheral angulation; upper surface without carina, moderately con- 

 cave; peripheral band comparatively thick, probably trilineate; 

 lower carina not so distinct but clearly preserved; lower slope in- 

 clining inward, being first concave and then convex. Surface 

 markings on the upper surface curve backward to the peripheral 

 band ; those of the lower slope, on the contrary, pass in a somewhat 



