(i) 34 Palseontologia Sinica Ser. JJ 



MEASUKEMENTS. The following are the measurements of the types: 



Diameter of Diameter of 



Height body-whorl umbilicus 



1. (Fig 14), 12. 5 mm. 19. 5 mm. 5.5 



2. (Fig 15), 11. 5mm. (approx.) 20. Omm. 6. 



HORIZON AND LOCALITY: In the upper portion of the Actinoceras or Machiakou 

 limestone at Tangshan, province of Chihli. Collected by George B. Barbour, Professor of 

 Geology in Peking Christian University, in whose honor the shell is named. Also 

 Survey collection. 



Family MURCHISONID^E Koken 



Genus HORMOTOMA Sailer 

 Hormotoma doquieri Grabau (sp. nov.) 



Plate 111 Figs. ICa-b 



Shell small, high spired with 7 or more whorls (the apex is imperfect), which 

 embrace very slightly, leaving the larger part of the preceding whorls exposed. Apical 

 angle about 1G. Shoulder Hat or gently convex. Shoulder angle obtuse, characterized 

 by a revolving band, which is bordered by a spiral on either side. Lower part of whorl 

 rounded, and broader than the shoulder. Lines of growth prominent, producing a 

 subdued surface ornamentation. Aperture not fully shown, but apparently with an 

 anterior notch. 



This shell has the general character of Hormotoma gracilis Hall, from the Chazy 

 and Stones River, and the Trenton of North America, but the shoulder is Hatter in the 

 Chinese form and the lower exposed part of the whorl proportionately higher than in the 

 American species. The lines of growth are also more prominent in the Chinese form. 



HORIZON AND LOCALITY: In the Liangchiashan limestone of the Shih-Mun-Chai 

 region, eastern Chihli province, collected by F. F. Mathieu. The specific name is 

 given in honor of M. Alexandre Doquier chief of mines of the Kailan Mining Ad- 

 ministration. 



