FAUNA OF THE KI-SIN-LING LIMESTONE. 291 



which place the collections were made by the Carnegie Institution of Washing- 

 ton Expedition. These fossils are from several horizons, which are designated 

 as follows: (A) Neighborhood of Kiau-tshang-pa ; (a) dark trilobite limestone; 

 (6) light gray brachiopod limestone ; (c) red brachiopod and crinoidal lime- 

 stone; (d) marly coralline limestone between Kiau-tshang-pa and Shorn - 

 hsuen-yi; (E) Remains from the neighborhood of Tshau-tien : (a) light-colored, 

 crystalline, oolitic, brachiopod, and crinoidal limestone. Both Ordovician 

 and Silurian faunas are included in these collections, the Ordovician faunas 

 being those of the dark trilobite limestone, and the light gray brachiopod 

 limestone from the neighborhood of Kiau-tschang-pa. The relations of the 

 strata in this locality have been shown by von Richthofen, 1 these two beds 

 being included in the axial portion of an overturned anticline among the 

 lowest strata of the section. 



The known faunas of these two Ordovician beds are not large, the follow- 

 ing forms being recorded from the dark trilobite limestone : 



Asaphus sp. Trinucleus richthofenl n. sp. 



Calymene sp. Orthis kiautschangpensis n. sp. 



None of these forms can be identified among the collections of the recent 

 expedition. The species described as Orthis kiautschangpensis seems to be 

 a member of the genus Plectorthis, and somewhat resembles the form here 

 described as P. willisi, but it is proportionately broader toward the hinge- 

 line and has more angular cardinal extremities ; two of the genera of trilobites 

 Asaphus and Calymene, also occur in the recent collections, but Trinucleus 

 has not been detected, although this genus would not be out of place in such 

 a fauna as has been recognized. 



From the light gray brachiopod limestone the following forms have been 

 recorded : 



Orthis calligramma Dalman var. Strophomena corrugalella Davidson ? 



Leptana sericea Sowerby Spirifer radiatus Sowerby 



Of these species Orthis calligramma is one of the most conspicuous members of 

 the faunas described in the present paper from Sii-kia-pa, near Ta-ning, and 

 an undetermined species ofStrophomenais another one of the common species. 

 Lcptczna, or, more properly, Plectambonites sericea, has not been detected, 

 although it would not be out of place in association with Dalmanella testudi- 

 u aria. The shell referred to Spirifer radiatus by Kayser is probably incor- 

 rectly determined; the species and even this genus would be entirely out of 

 place in any fauna with Orthis calligramma and the other forms recorded, and 

 judging from the illustrations the specimens are too imperfect to permit their 

 certain identification as Spirifer. It is not impossible that this so-called 

 Spirifer radiatus is allied to the forms described in this paper as Hemipronites 

 tenuistriatus , although the two forms are certainly distinct, at least specifically. 



China, vol. ii, pp. 597-598, fig. 108. 



