54 



surface of the test preserved, it certainly had neither annular nor longitudinal 

 sculpture of any kind, except at most fine lines of growth. On account of its 

 peculiar nummuloidal siphuncle, it is referred to the genus Actijwccrns 

 (Oriiwccras). 



G. C. Crick reported the occurrence of an Actinoccrns nearly allied to 

 Oruioccrns toinifilum Hall^* in Shan-tung ; the latter is a species common in 

 the Ordovician Black River limestone of New York State. The Chinese 

 specimens, the present one as well as that figured b)- Crick, are apparently 

 provided with a narrower siphuncle than the American form, whereas the 

 former two resemble each other very closely not onl)- in this feature, but in all 

 other features. It i.s very probable tliat the present specimen is specifically 

 identical with the one from Shan-tung. 



A. richtliofou Frech'-' from Liau-tung and Korea is a more conical shell, 

 rapidly enlarging anteriorly ; its nunmiuloidal sipluincle is broader than that 

 of the present species. 



Locality : — Pan-tse-ya, Hu-hsi, Ilsing-bhan-hsicn, prii\-. Hu-pei (Nod.'V 

 Coll. No. 102). 



Trocholitidse. 



Discoceras, Jjakk.'\nde. 



Discocerus eurasiaticum Fkech. 



PI. XVIII., Figs. 2a-b. 



191 1. l)iscocci-as iiD asial iciitn P'rech : in Riciithofen's China vol. V., p. 

 5, pi. I,, figs. ia-2b. 



1) J. Hall; Palaeoiitclog}' of New York, vol. I., p. 55, pi. XV., fig. i; pi. XVI., fig. i; pi. 

 XVII, fig. I. Grabau and Shimer: North American Index Fossils, Invertebrata. Vol. 

 II., p. XVII., 115, fig. 1351. 



2) Frlch: in RicHTHoi liN's China vol. V., p. 8, pi. II., fig. 4. This species was first established 

 bj' Frech on the specimens from Hsiau-orrh, Liau-tung. The G. I. S. Collection contains 

 many specimens of this species, which were collected by myself from Kwa-sen-do, Ko-to- 

 gun, Hei-an-nan-do, Korea ifilMMM^^^)- 



