280 RESEARCH IN CHINA. 



2. Madurea ? or Helicotoma ? sp. A flat-coiled gastropod shell represented by 



a cross-section upon the weathered surface of the limestone. Neither 

 the generic nor specific relations of the shell can be determined, but it 

 probably belongs to one of the two genera Madurea or Helicotoma, both 

 of which are Ordovician forms; if it is a Madurea it is a very small 

 species of the genus. 



3. Lophospira sp. This is a longitudinal section of a moderately high spiral 



shell with angular volutions, which is almost certainly a Lophospira, 

 although its specific characters can not be distinguished. 



4. Orthoceras sp. Imperfect longitudinal sections upon the weathered surface 



of the limestone, similar to those at Localities C 39 and C 53. 



5. Asaphus ? sp. An imperfect cranidium of a trilobite. It is certainly one of 



the asaphids, but its true generic relations are not clear, and it is too 

 incomplete for specific determination. 



Locality C64. Two and seven-tenths miles (4.3 km.) southwest of 

 Yen-chuang, Shan-tung. Upper part of Ch'au-mi-tien limestone. 



i. Orthoceras sp. Longitudinal sections of two examples upon the weathered 

 surface of the limestone. Both specimens are rather small and slender 

 forms, the maximum width of each being about 6 mm. ; they probably 

 belong to two species, one of which has much closer septa than the 

 other. 



Locality C65. Five and a half miles (9.8 km.) southwest of Tsi-nan, 

 Shan-tung, from the Tsi-nan limestone. 



1 . Strophomena ? sp. Several imperfect fragments of a brachiopod shell upon 



the weathered surfaces of the limestone, all of which are too imperfect 

 for certain identification. 



2. Orthoceras sp. A very imperfect longitudinal section upon the weathered 



surface of the limestone. 



Locality C ? A limestone fragment collected from gravel in the valley 

 of a dry stream, 4.8 miles (7.6 km.) west -southwest of Tsi-nan, Shan-tung. 



i. Orthoceras sp. A weathered longitudinal section of a specimen having a 

 maximum diameter of 55 mm. 



COLLECTION FROM SSI-CH'UAN. 



The Ssi-ch'uan collections are from two localities on the Ta-ning River 

 near Sii-kia-pa, in the extreme eastern portion of the province. The fossils 

 occur in the uppermost layers of the Ki-sin-ling limestone, a massive forma- 

 tion of dark color 3,500 feet (1,066.7 m -' ni thickness, which rests conform- 

 ably upon subjacent beds of Cambrian age. The material collected, although 

 not extensive in amount, affords data of great importance and is sufficient 

 to admit of a fairly approximate correlation of the limestones in which the 

 fauna occurs. The fauna from the two localities, which are scarcely 2 miles 

 (3.2 km.) apart, are much alike and indicate essentially the same horizon. 



