DESCRIPTION OF GENERA AND SPECIES. 



28l 



Locality 20/C is in a gulch just northeast of Sii-kia-pa, and has furnished 

 the following species: 



Strophomena sp. undt. 

 Triplecia poloi Martelli 

 Orthis calligramma Dalman 

 Plectorthis willisi Weller 

 Dalmanella testudinaria (Dalman) 

 Dalmanella subaquata (Conrad) 

 Clitambonites chinensis Weller 

 Hemipronites tenuistriata Weller 

 Gastropod (gen. and sp. undt.) 

 Cyrtodonta ? sp. undt. 

 Ampyx chinensis Weller 



Bathyurus sp. undt. 

 Asaphus sp. cf. A. expansus Dalman 

 Asaphus asialicus Weller 

 Asaphus chinensis Weller 

 Asaphus several spp. undt. 

 Isolelus sp. undt. (hypostome) 

 Isotelus sp. undt. (pygidium) 

 Illcenus ? bronteoides Weller 

 Proetus ? sp. undt. 

 Calymene ? sp. undt. 

 Pterygometopus ? sp. undt. 



Locality 20/B is at the narrows in the river about 1.5 miles (2.4 km.) 

 above Sii-kia-pa, and has furnished the following species : 



Lingula ? sp. undt. 

 Strophomena sp. undt. 

 Plectorthis willisi Weller 

 Dalmanella testudinaria (Dalman) 

 Clitambonites chinensis Weller 

 Cornulites sp. undt. 

 Gastropod (gen. and sp. undt.) 

 Vagiiioceras sp. undt. 



Ampyx sp. cf. A. costatus Boeck 

 Asaphus blackwelderi Weller 

 Asaphus taningensis Weller 

 Asaphus Itfvis Weller 

 Asaphus several spp. undt. 

 Megalaspis minor Weller 

 Proetus sp. undt. 



DESCRIPTIONS OF SPECIES FROM THE KI-SIN-LING LIMESTONE. 



Lingula ? sp. undt. 



A single imperfect specimen of a small inarticulate brachiopod may be referred 

 provisionally to the genus Lingula. It is shorter and rounder than usual for the 

 members of that genus, and if its characters could be accurately determined it might 

 be referred elsewhere. 



Strophomena sp. undt. (plate 25, figs. 1,2). 



The specimens of this species are somewhat common in this collection, but all are 

 poorly preserved. They can not be definitely identified with any of the described 

 species, but are somewhat closely allied to such forms as 5. incnrcata (Shepard) 

 from the Mohawkian faunas of North America. One of the most complete speci- 

 mens, a brachial valve, has a length of 14 mm., a width of 20 mm., and a convexity of 

 3.5 mm. A few other individuals were somewhat larger, but the dimensions given 

 seem to indicate about the average size, which is smaller than is usual among the 

 allied American species. The surface of the shells is marked by fine radiating costae 

 which, in specimens not too much exfoliated, are variable in size, from two to six 

 finer costae lying betweenthe coarser ones; the surface is also marked by finer concen- 

 tric lines, as in the American 5. incitrvatits. The greatest convexity of the brachial 

 valve is anterior to the middle, and the cardinal extremities are compressed. The 

 outlines of different individuals vary somewhat, and it is possible that more than 

 one species is present in the fauna. 



Triplecia poloi (Martelli) (plate 25, figs. 7-9). 



1901. Schizoplwria poloi Martelli, Boll, della Soc. Geol. Hal., vol. xx, p. 302, plate 4, figs. 17-22. 

 1901. Porambonites inl,-r<-,;!i'iis Martelli (not Pander), Idem, vol. xx, p. 304, plate 4, figs. 13-16. 



