53 



portioa of the shell more strongly arcuate than C. cllipticum Lossen from the 

 Ordovician limestone near Sorau ; I consider the difference is considerable 

 enough for the specific separation of the two forms. Further, the former is 

 more slender than the latter. 



C. plcbciitni Barrande^^ from Er-E2 of Boliemia resembles the present 

 species more closely, being distinguishable only by its but sliglitly bi'oadcr 

 shell. 



Locality : — Hing-shan-hsien, prov. Hu-pei (Noda Coll.). Fri-xh's speci- 

 men is from the locality between the second and tliird gorges of the Yang-tsc- 

 kiang above I-chang. 



Actinoceratidse. 



Actiuoceras, Bronn. 

 Subg. Ormoceras, Stokks. 



Actinoceras (Ormoeeras) sp. indet. 



PI. XVIII., Fig. 12 ; I'l. XIX., Fig. 9. 



191 1. Actinoceras {Orinoccrns) aff. tcuiiifiliiui Crick : Notes on Some 

 Specimens of Straight-shelled Nautiloidea collected by the Rev. 

 S. CouLiXG. Geol. Mag. Dec. IV., vol. X., p. 481, pi. XXII., 

 fig. C. 



Shell straight, large, cylindrical ; circular ? or oblong ? in cross section ; 

 34 mm. in diameter. Septa numerous, moderately concave ; 6 mm. apart. 

 Siphuncle submarginal, 10 mm. in diameter, swelling moderately between 

 septa ; internal deposit very thick (3-4 mm.), leaving a space at most 2.5 mm. 

 wide for somewhat irregularly annulated endosiphuncle and with extremely 

 narrow tubuli radiating from the annuli. 



This species is represented by a very fragmental specimen, the surface of 

 which is also much eroded ; however, judging from the small portion of the 



i) Barrande: Systi'iTie Silurian. Vol. II., p. 525, pi. CIX., figs. 11-16; pi. CCVII., figs. 1-5; 

 pi, CCVIIl., fitis. i_.-i6. 



