(iv) 22 Palseontologia SinicCi Ser. B 



Horizon and Locality: — from the Cambrian purple shaie of Luan-Chou: 

 collected by Dr. F. F. Alathieu. The specific name is given in honor of Mr. C. P. Liu, 

 fiJSM dean of the Geological Department of the National Normal College of Peking. 



Lingulella kayseri Grabau (mss.)(sp. nov.) 



Plate I, Figs. 10 a-lOc 



1.SS.3 Lingulella sp. Kayser, in Richthofen. Vol- IV, p. 35, pi. Ill, fig. :;. 



1:>19 Lingulella davisii Walcott (non McKoy) Cambrian Brachiopoda p. ■I.'^O, pi. XXX, figs. 2, 2 a; pi. 



XXXI, figs. 6, 6a-h. 

 1922 Lingulella kayseri Grabau (mss.) 

 142;? Lingulella kayseri Grabau, Sun. Bull- GeoL Soc- China, Vol. IL p. 08. (listed) 



"Shell of medium size and subrectangular form; length and width approximately 

 as five to four. Sides of shell nearly parallel and only gently curved, frontal margin 

 rounded at the sides, straight in the center; posterior margins straight on either side of 

 the beak, meeting at the latter at an angle of about 125". 



"Surface marked by growth lines and at intervals by faint concentric wrinkles. 

 Crossing these are radiating strise which on the posterior lateral margins, where they are 

 most strongly marked, have an obliquely outward and backward direction, giving a 

 pronounced ornamentation to the surface. 



^'Dimensions. The following dimensions show the rate of variation in the length 

 and width of the shell in millimeters. 



1 2 M Richthofen 's, specimens 



Length 10.0 ]().2 11.:; 17.0 1:>.0 



Width S.2 S.5 9.0 13.5 10.5 



"This species appears to be the same as the specimens noted and figured as 

 Lingulella cfr. nathorsti Linnarson by Kayser, and which were obtained by von 

 Richthofen in a greenish-gray thin-bedded or somewhat slaty limestone from Sai-ma-ki 

 M^"jM Liau-tung, Manchuria. There that species is associated with another shorter and 

 rounder form (Obolus) Avhich appears to be identical with the smaller form associated 

 with our species. The associated trilobites in the Liau-Tung region comprise Conoce- 

 phalites frequens, Anomocare latelimhaium, Agnosias chinensis. The last two species are 

 refern^-d by Walcott to the .Middle Cambrian whereas our specimens are associated with 

 Upper Cambrian trilobites. It is not impossible thatthe specimens described by Kayser 

 belong to distinct species. They are larger than our specimens and apparently without 

 their ornamentation but agree closely with them in form and proportions. 



