430 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 54 



PAGE 



DoHchomctopus ( f ) deois Walcott 365 



Fig. I. (X2.) Cranidium crushed down and flattened in shale. U. S. 



National Museum, Catalogue No. 58235. 

 \a. (X2.) Free cheek associated with the specimen represented 



by fig. I. U. S. National Museum, Catalogue No. 58237. 

 \b. (X2.) Matrix of a pygidium associated in the same shale 



with the specimen represented by fig. i. U. S. National 



Museum, Catalogue No. 58238. 

 ic. (X2.) Pygidium with test removed, associated in shale with 



specimens represented by figs, i, la, and \b. U. S. National 



Museum, Catalogue No. 58239. 



All of the specimens represented by figs, i, la-c, are in argilla- 

 ceous shale»from locality 350, Middle Cambrian: Fu-chou series, 

 Liau-tung, Manchuria, China. [See Research in China, Pub. No. 

 54, Carnegie Inst, of Washington, Vol. 3, 1913, Walcott, Cambrian 

 Faunas of China, pi. 21, figs. 13, 13&, 13c and 13d, respectively.] 



\d. (X 1.5.) Cranidium referred to Bathyuriscus asiaticus 

 Lorenz, by Lorenz. This occurs in shaly limestone. Plas- 

 totype U. S. National Museum, Catalogue No. 58539. Col- 

 lected by Dr. Th. Lorenz at Wang-tschuang. Shan-tung. 

 China. [See Walcott, Cambrian Faunas of China, pi. 22, 

 fig. 2b.] 



le, le'. (X2.) Dorsal view and side outline of a cranidium. 

 L^. S. National Museum, Catalogue No.- 58242. From local- 

 ity C 57, Middle Cambrian : Kiu-lung group, south of Kao- 

 kia-p'u, Shan-tung, China. [See Walcott, Cambrian Faunas 

 of China, pi. 22, fig. lb.] 



i/> i/'- (X2.) Dorsal view and side outline of a cranidium. From 

 locality Ci, Middle Cambrian: Kiu-lung group, 2 miles 

 (3.2 km.) south of Yen-chuang, Shan-tung, China. U. S. 

 National Museum. Catalogue No. 58240. [See Walcott, 

 Cambrian Faunas of China, pi. 22, fig. i.] 



ig- (X3-) Free cheek, associated with specimen represented by 

 fig. if. U. S. National Museum, Catalogue No. 58241. [See 

 Walcott, Cambrian Faunas of China, pi. 22, fig. la.] 



ih. (X3-) Hypostoma associated with specimen represented by 

 fig. le. U. S. National Museum, Catalogue No. 58243. From 

 locality C57, Middle Cambrian: Kiu-lung group, south of 

 Kao-kia-p'u, Shan-tung, China. [See Walcott, Cambrian 

 Faunas of China, pi. 22, fig. ic] 



ii, li'. (Natural size.) Dorsal view and side outline of a pygidium 

 from locality C 4, in limestone, a little below the layer from 

 which the specimen represented by fig. 1/ was collected. 

 v. S. National Museum, Catalogue No. 58248. [See Wal- 

 cott, Cambrian Faunas of China, pi. 22, fig. ih.] 



ij. (X 10.) Cranidium of a young individual associated with 

 specimen represented by fig. ic. (C57.) U. S. National 

 Museum, Catalogue No. 58246. [See Walcott, Cambrian 

 Faunas of China, pi. 22, fig. i/.] 



ik, \l. (X 15- ) Nepionic stages in the development of a trilobite, 

 probably of this species. From locality C 57, Middle Cam- 

 brian : Kiu-lung group, south of Kao-kia-p'u, Shan-tung, 

 China. U. S. National Museum, Catalogue Nos. 5S244 and 

 58245. [See Walcott, Cambrian Faunas of China, pi. 22. 

 figs. It? and i^.] 



