DESCRIPTION OF GENERA AND SPECIES. 6 1 



When the surface of the outer wall is slightly worn the radiating lines and trans- 

 verse septa are very clearly shown. 



The generic reference to Coscinocyathus is made on account of the presence 

 of the regular cross-septa in addition to the radial septa, as defined by Dr. J. G. 

 Bornemann [1884, p. 704]. None of the Siberian forms of the Archseocyathinse 

 described by Dr. Eduard von Toll [1899, pp. 38-53] appears to be closely related 

 to this species. 



The specific name is given in recognition of the work of Miss Elvira Wood in 

 connection with the preliminary study of the Cambrian fauna of China. 



Formation and Locality. Middle Cambrian: (C75) Limestone near the base 

 of the Ki-chou formation [\Villis and Blackwelder, 1907, p. 143], 4.5 miles (7.2 km.) 

 south of Wu-t'ai-hien, Shan-si, China. 



Collected by Eliot Blackwelder. 



ANNELIDA. 



Genus PLANOLITES Nicholson. 



Planolites sp. undt. 



Plate i, Figure 5. 



Casts of a small burrowing worm that penetrated in all directions the calcareous 

 mud now forming thin layers of limestone. The specimen illustrated shows the 

 casts of burrows on the line of the original surface of the mud. It suggests that a 

 number of small worms had followed along the filled-in boring of a large worm. 



Formation and Locality -Middle Cambrian: (36 f) Fu-chou series; about 1,000 

 feet (305 m.) above the white quartzite [see Blackwelder, 19076, p. 92, for general 

 section giving stratigraphic relations] ; collected in a low bluff on the shore of 

 Tschang-hsing-tau Island, east of Niang-niang-kung, Liau-tung, Manchuria, China. 



Collected by J. P. Iddings and Li San. 



BRACHIOPODA. 



Genus MICROMITRA Meek. 



For discussion of the genus Micromitra and its subgenera see Monogr. U. S. 

 Geol. Survey, vol. LI, 1912, pp. 332-365. 



Micromitra sculptilis (Meek). 

 Plate i, Figures 6, 6a. 



Iphidea (??) sculptilis MEEK, 1873, Sixth Ann. Kept. U. S. Geol. Survey Territories for 1872, p. 479. 



(Described and discussed as a new species, and the generic name Micromitra proposed in case 



the species should prove to belong to a new genus.) 

 Kutorgina minutissima HALL and WHITFIELD, 1877, U. S. Geol. Expl. 4oth Parallel, vol. iv, pt. 2, pp. 



207-208, plate i, figs, ii and 12. (Described and discussed as a new species. The specimens 



represented by figs. 1 1 and 12 are redrawn by Walcott, 1912, plate HI, figs. 56 and $c.) 

 Kutorgina sculptilis (Meek), WALCOTT, 1884, Monogr. U. S. Geol. Survey, vol. vm, p. 20, platei, figs. 



7, 70-J; plate ix, fig. 7. (The specimens represented by figs. 7, ja-b, plate I, and fig. 7, plate 



ix, arc redrawn in this monograph, plate HI, figs. 5, 56, and 5C.) 

 Iphidea sculptilis Meek, SCHUCHERT, 1897, Bull. U.S. Geol. Survey No. 87^.235. (Merely goes back 



to original generic reference.) 

 Iphidea sculptilis Meek, WALCOTT, 1899, Monogr. U. S. Geol. Survey, vol. xxxii, pt. 2, pp. 447-448, 



plate LX, figs. 5, 5a-c. (Discussed. The specimen represented by figs. 5, $a-c is redrawn by 



Walcott, 1912, plate in, fig. 5<z.) 

 Iphidella sculptilis (Meek), WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxvm, p. 308. (Merely changes 



generic reference.) 

 Micromitra sculptilis (Meek), WALCOTT, 1912, Monogr. U. S. Geol. Survey, vol. LI, pp. 341-342, plate 



in, figs. 5, 5<z-e. (Describes, discusses, and illustrates species.) 



