(ii) 6 P alxontologia Sinica Ser. B. 



yet complete enough in our Institute library which was just established last year, so the 

 palaeontological work is not possible at present at the Institute. Therefore on the 

 first of March of the year 1929, Prof. Lee granted me leave to bring this material to the 

 Geological Survey in Peiping for the purpose of identification and descriptioa of these 

 specimens under the direction of Prof. Grabau, the chief PalaBontologist to the Surveys 



After I had finished the work of describing the Ordovician cephalopods brought 

 here from our Institute, Prof. Grabau asked me to continue to take up some other 

 cephalopods collected by Prof. J. S. Lee and Mr. C. Y. Hsieh, and a similar collection 

 presented to the Survey by the late J. Langford Smith. In 1924 Prof. Lee made an 

 excursion to the Yangtze Gorges, collecting some cephalopods and many other fossil, 

 from the Neichiashan formation. Mr. Hsieh also obtained very abundant Ordovician 

 cephalopods, which were partly from the upper part of Tafang limestone at Yang-sing- 

 hsien (^ ^ !li), eastern Hupeh in 1923, and partly from the western Hupeh in the 

 autumn of the year 1924. Though these collections consist of a large quantity of 

 specimens, the number of species is not very great. Besides, the majority of them 

 are conspecific, not only congeneric, with those collected by myself, but some specimens 

 such as Cameroceras, Protocycloceras etc. have not been met with in the localities of 

 northern Hupeh. 



First of all I would express my special indebtedness to Prof. A. W. Grabau for 

 his courtesy in giving me much valuable suggestions and criticisms. To Prof. J. S. Lee 

 Director of the Institute, Dr. W. H. Wong, Director of the Geological Survey, Dr. V. K. 

 Ting, Editor of the Palseontologia Sinica of China and Dr. Y. C. Sun President of the 

 Palfeontological Society of China I am also indebted for furnishing me every facihty for 

 carrying on the palasontological work in the Survey laboratory. Finally, I particularly 

 tender my deep appreciation to Mr. K. H. Hsii and Mr. Y. S. Chi for their help in the 

 photographic work. 



TERMINOLOGY 



All Nautiloids are provided with an external shell, which may be termed ceracone 

 or conch. When the shell is straight, it is called orthoceracone; when curved, cyrtoceracone. 

 If the conch is curved in a loose coiling manner it is called gyroceracone; and closely 

 coiled having the impressed zone, called nautilicone. The embryonal shell is known as 

 the protoconch; and the septate shell, the phragmacone. The interior of the shell consists 

 of many transverse partitions or septa. The spaces confined between the septa are the 

 chambers or camer^e. The chamber of habitation, body chamber or the living chamber 

 is the last chamber occupied by the body of the animal. There is a small hollow tube 

 or siphuncle, which passes through all the septa, occupying a different position in differ- 

 ent genera. The septa abruptly bend backward and continue to a certain extent around 



