2 90 RESEARCH IN CHINA. 



CORRELATION OF THE FAUNA OF THE KI-SIN-LING LIMESTONE. 



A small Ordovician fauna from southern Shen-si has been described by 

 Martelli, 1 with which this fauna from the Ki-sin-ling limestone must be com- 

 pared. Only six species have been recorded by Martelli, four of which are 

 brachiopods, with one bryozoan and one annelid tube; of one of the brachi- 

 opods two varieties are recognized. Martelli's list of species is as follows : 



Orthis calligramma Dalman, var. serica var. nov. Orthisina giraldii sp. nov 



Orllris calligramma Dalman, var. davidsoni de Verneuil Fenestella ambigita Hall 



Schizophoria poloi sp. nov. Spirorbis inornatus Hall 

 Porambonitcs inlercedens Pander 



It is scarcely worth while to recognize the two varieties of Orthis calli- 

 gramma as distinct; the species is frequently more or less variable, and the 

 Shen-si examples seem to be essentially like those collected by the members 

 of the Carnegie Institution of Washington Expedition, and all these Chinese 

 specimens closely resemble those from Russia illustrated by de Verneuil. 

 The Orthisina giraldii of Martelli is apparently a true Hemipronites, and is a 

 very close ally of the species described in the present paper as H. teniiistriatns. 

 The examples of Porambonites intercedens and Schizophoria poloi of Martelli's 

 list seem both to be representatives of a single species with which one of 

 the brachiopods collected in Ssi-ch'uan by Mr. Blackwelder is apparently 

 identical; the species, however, should undoubtedly be referred to the genus 

 Triplecia. The two additional species of Martelli's list, Fenestella ambigua 

 and Spirorbis inornatus, have no representatives in the Ssi-ch'uan fauna, and 

 the identity of these Chinese examples, associated as they are with typical 

 Ordovician brachiopods, with species described by Hall from the Niagaran of 

 North America, is extremely doubtful, to say the least. 



The essential species in Martelli's list, therefore, which must be con- 

 sidered in a comparison of the Shen-si fauna with that of Ssi-ch'uan, are only 

 three in number Orthis calligramma, Hemipronites giraldii, and Triplecia 

 poloi. Of these species two are recognized in the present Ss'i-ch'uan fauna 

 and the third, Hemipronites giraldii, has a very close ally in II. tenmstrialits; 

 the faunas from the two localities may be safely considered as marking the 

 same geologic horizon and in all probability the same limestone formation. 

 The two localities, indeed, are situated in the same general region of China, 

 Martelli's specimens having come from a locality in the Ts'in-ling Mountains 

 to the north of the Han River Valley, while the collection described in the 

 present paper came from the southern side of the same valley ; the two local- 

 ities probably are not over 200 miles (320 km.) apart and may perhaps be 

 even more nearly approximate. 



Several small collections of fossils secured by Baron von Richthofen in 

 northern Ssi-ch'uan, from the region about Tshau-tien, have been described by 

 Kayser, 2 this locality being about 300 miles (480 km.) west of Ta-ning, near 



'Fossili del Siluriano Inferiore dello Schensi (Cina), by Alessandro Martelli, Boll, della Soc. Geol. Ital.. 

 vol. xx (1901), pp. 295-310, pi. iv. 



= Mittcl- und ObcrsilurischeVersteinerungen aus dem Gebirgsland von Tschau-tien, by Emanuel Kayser 

 (Richthofen's China, vol. iv, pp. 37-74, plates 2, 3, 4). 



