326 RESEARCH IN CHINA. 



jecting umbo and a less gibbous inferior outline. Since the Chinese specimens are 

 preserved as internal molds it is impossible to make a definite comparison as to 

 convexity, sculpture, etc. 



Locality and Horizon. Pennsylvanian (near middle of Wu-shan limestone); 

 Ta-ning-hien, East Ssi-ch'uan (station 16). 



Euomphalus sp. 



The collection from one locality contains two fragments of what appears to be 

 a large species of Euomphalus, although they may possibly represent an Omphalo- 

 trochiis. They suggest our American species subquadralus and pernodosus, and pos- 

 sibly, like the latter, may belong to De Koninck's Phymatifer, if one chooses to 

 recognize that group of euomphaloids by a distinct name. 



Locality and Horizon. Pennsylvanian (Wu-shan limestone) ; near Ta-ning-hien, 

 East Ssi'-ch'uan (station 3). 



Phillipsia sp. (a). 

 Plate 29, Figure 28. 



This species is represented by a pygidium which has been slightly crushed at 

 the posterior end, so that the originally subtrigonal shape has been exaggerated, 

 while most of the projecting portions, except toward the front, have been abraded. 

 The greatest width is 15 mm. and the length is 13 mm. For the reasons given above 

 the number of segments can not be counted, but there must have been from 18 to 

 20 on the axis. The surface ornamentation is probably obscured, for if rows of 

 nodes once covered the surface no trace of them remains. 



The general appearance of this pygidium is not unlike Phillipsia scitula of the 

 American Coal Measures strata, but the Chinese form is too imperfectly known to 

 allow comparisons with other species. 



Locality and Horizon. Pennsylvanian (Wu-shan limestone) ; near Ta-ning-hien, 

 East Ssi-ch'uan (station 2). 



Phillipsia sp. (b). 



In the Shan-tung cherts (station 59) was found a single small pygidium pre- 

 served as a mold of the inferior side. The surface ornamentation has of course been 

 lost. The shape is elongate, setnielliptical, the width and length being approxi- 

 mately equal and about 4 mm. The axis is wide, one-third the entire surface or 

 a little more, and strongly elevated. It contains about 14 annulations, while about 

 9 can be counted upon each of the lateral portions. There is a wide, smooth border 

 and doublure, which is more obvious around the posterior end, the strong transverse 

 curvature of the pygidium causing it to be much foreshortened at the sides. 



It is doubtful if this is the same species as the foregoing. Its small size and 

 different preservation, combined with the geographic difference of occurrence, have 

 made me hesitate to place both under the same caption. 



Locality and Horizon. Pennsylvanian; near Ts'ai-kia-chuang, Shan-tung (sta- 

 tion 59). 



Bythocypris ? sp. 



In the cherts of Shan-tung (station 59) occur a number of casts of small ostra- 

 cods indeterminable in their present condition. They probably belong to the 

 Bythocypris group and comprise several species. 



Locality and Horizon. Pennsylvanian; near Ts'ai-kia-chuang, Shan-tung (sta- 

 tion 59). 



