(i) 84 Palteontologia Sinica Ser. B 



frequently displaced apicad and made to appear double by the development of pseudo- 

 septa, * 



Crick describes a specimen from the Couling collection, apparently of this 

 species, which has a length of 95 mm., and a maximum width of 50 mm. tapering very 

 slowly, and with a siphuncle at that point about 24 mm. in diameter. He describes the 

 camera? as 11 mm. high, but that seems out of all proportion to the shell, (being as 1 to 

 4.5 as compared with 1 to 8 or 1 to 10 in the typical forms) and would argue a rapid 

 elongation of the chambers with the growth in length of the shell. 



HORIZON AND LOCALITY : This species has been obtained from the Machiakou 

 (Actinoceras) limestone of Hsi-Hsien, province of Honan, (L. C. Taun), from Machia- 

 kou, Luan Hsien, Chihli province (H. C. T'an), and. from Lincheng, Shantung province 

 (F. F. Mathieu). The specimen collected by Samuel Couling, came from Ching Chow 

 Fu, Kiaochow, Shantung. Yabe (loc. cit. Plate XIX, fig. 9) figures a specimen of 

 Actinoceras from No-lu-ping Hu-ch'i, Hsing-shan-Hsien, province of Hupeh, which may 

 belong to this species, though the specimen is in a very imperfect condition. The other 

 specimen figured by Yabe (Plate XVIII, fig. 12) from Pan-tse-ya, same district and 

 province does not belong here, the septal interval being proportionately much greater 

 than is normal for this species, while the siphuncle is submarginal. 



The specific name is given in honor of Samuel Couling, A. M. Editor of the 

 China Review, Shanghai, who first brought to the notice of scientific men the occurrence 

 of the genus Actinoceras in the Ordovician rocks of China, and to whom the Survey is 

 indebted for courtesies in connection with these studies. 



Actinoceras suanpanoides Grabau (sp. nov.) 



Plate VIII, figs. 3a, ft. 4n, ft; Plate IX, figs, la, ft. 







Shell slender, tapering at the rate of about 1 in 5.5; section apparently oval, with 

 a slight flattening on the ventral side. Siphuncle excentric nearest the flattened side, 

 from which it is separated by a distance equal to about half its diameter. In the early 

 stages the siphuncle occupies more than half the diameter of the shell ( in some cases?) 

 but later the proportional diameter is not much over one-third that of the shell. The 

 nummuli are somewhat flatter on the forward as compared with the posterior end and the 



See the figure of the American species reproduced in Graban and Shinier; North American Index Fossils 

 Vol. II p. 116; fig. 1351. 



