(iv) 16 Palseontologid Sinica Ser. B. 



based on the number of stipes, and only one stipe of this species is known, the generic 

 determination of this specimen is still somewhat doubtful. 



This species occurs in a thin slab of gray limestone which was collected several 

 years ago by Mr. K. W. Hsu {^\$.^) of National South Eastern University. 



Horizon and locality: Upper Cambrian; Kaolishan limestone of Tai-An, 

 Shantung. 



Class ANNELIDA 



Cenns ClimACTICHNITES Logan 

 Climactichnitesjlmathieui Sun (sp. no v.) 



Plate I. Fig. 2. 



One specimen from Luanchou contains the trails of an annelid, which apparently 

 belongs to CUmactichnites. The trails of Climactichnites were also found in the Upper 

 Cambrian of New York and Wisconsin, N. America. 



Woodworth suggests that the animals which made these trails were mollusks ca- 

 paple of crawling up from the water at low tide, while Walcott thinks the trails were 

 certainly made by annelids. 



I agree with Dr. Walcott, because many annelids have been found in the Cam- 

 brian strata. 



The Chinese form is represented by an impression of tlie trails on the under side 

 of the rock, which clearly shows the character in relief. 



It is small, being only 3.5 mm. in width having 8 grooves in 1 cm, indicating 

 that it was the trail of an annelid of ordinary size. 



This species is quite distinct from any known foreign species. I take pleasure in 

 naming it in honor of Dr. F. F. Mathieu, geologist of the Kailan Mining Administration. 

 .Measurements : — • 



Average width of groove with very narrow ridges 



separating it i ^^^^ 



Average length of the groove 2 mm. 



Horizon AND locality: Lower Cambrian, ^lanto shale of Luanchou; collected 

 by Dr. F. F. :\Iathieu. 



