Vol I. Orabau — Ordovician Fossils from North China (i) 93 



siphuncle. Most of the septa are broken off a short distance beyond the siphuncle, but 

 near the base of the section a few of them are found to continue outward, and although 

 they are somewhat broken they show the undoubted rather sharp return curve, so 

 characteristic of this genus. This is shown in the illustration. 



In its general form and character tliis species comes nearer to Gonioceras chaziense 

 Ruedemann* from the middle Chazy limestone of Chazy N.Y. on Lake Cliamplain (U. 

 S. A.) then to either of the other two known species from the higher rocks. The 

 siphuncle of the Chazy species is however only 7 mm. in diameter while the distance 

 between the septa averages 2 mm. The greatest width of that shell is a little over 70 

 mm. that of our species can not be ascertained. In the Chazy species each septum rises 

 within the body of the conch to the height of five cameras, before it forms the character- 

 istic return curve. In our species this character is much less pronounced, the septum 

 scarcely rising to the height of one and a half camera, and the angle of recurvature is 

 rather charp, while beyond it the septum continues with a gentle forward concavity. It 

 is at or near the angle of recurvature, that most of the septa are broken away. 



Horizon and Locality: The single known specimen came from Seng Chuang, 

 (Shen Tsun) Ning-Yang, province of Shantung, where it was collected by Dr. V. K. 

 Ting. The specimens described by Crick, which may belong to this species (though the 

 fact that one of his specimens was 25 cm. in length, makes this doubtful) were collected 

 by Mr. Samuel Couling near Chingchow Fu, Kiaochow, also in the province of Shantung. 



Class CRUSTACEA Lamarck 

 Sub- Class TRILOBITA Walch 

 Order Opisthoparia Beecher 



Family ASAPHID-^ Burmeister 



Genus ASAPHUS Brongniart 



Asaphus boehmi Lorenz 



Plate I, flgg. 8, 9. 



1906 Asaphus boehmi Lorenz. Beitrage zur Geologie und PalEeontologie von Ostasien, II. p" 

 84, pi. XVII, figs. 4, 5a, 5b. 



* N. Y. State Museum Bulletin No. 90 p. 494 plate 36 figs. 3 and 4. 



