48 



schicht mit ihren Rippen ; zwischen diesen Lamellen werden stark nach vorn 

 gerichtete Septa der inneren Schalenschicht abgelagert, welche die aussern 

 Rippen schrag kreuzen. Der Kragen besitzt also eine dem Schlitbande der 

 Pleurotomarien vergleichbare Structur, ohne aber direct als solches aufgefasst 

 werden zu konnen, denn die Lunulae des Pleurotomarienbandes gehoren der 

 ausseren Schalenschicht an." 



It is yet to be proven that the present specimen has this peculiar feature 

 of marginal carina. 



Locality : — No-lu-ping, Tung-hu-hsien, prov. Hu-pei (Usui Coll.). The 

 type specimens of this species are from a locality lying between the 

 second and third gorges of the Yang-tse-kiang above I-chang. 



Cephalospoda. 

 Nautiloidea. 



Orthoceratidae. 



Orthoceras, Breyn. 

 Orthoceras ehinense Foord. 

 PL XXVII., Figs. 3 a-b. 

 1856. Orthoceras sp. S. P. Woodward : 



Quart. Journ. Geol. Soc. London. Vol. XII., p. 378, pi. VI., fig. l. 

 1887. O. cJiineiisc YooiiX) : Catalogue of Fossil Cephalopoda. British 



Museum. I. P. 100. 

 191 1. O. chincnsc Frech : Richthofen's China, vol. V., p. 8, pi. II., 

 figs. 2 a-c. 



"Shell straight, cylindrical, rate of increase i in 9. Length of body 

 chamber unknown. Septa distant about 1 /2 the diameter or more, but becom- 

 ing more crowded as they approach the chamber of habitation ; direct, strongly 

 arched ; the necks very long, so as to reach nearly half way across the space 

 between two septa. SipJiuncle central, cylindrical, very slightly contracted 

 between the necks. Test unknown." This is the original diagnosis of O. 

 e/iine)ise given by Foord. 



