DESCRIPTION OF GENERA AND SPECIES. 61 
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 Archeocyathine 
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-chéu formation [Willis and Blackwelder, 1907, p. 143], 4.5 miles (7.2 km.) 
south of Wu-t’ai-hién, Shan-si, China. 
Collected by Eliot Blackwelder. 
ANNELIDA. 
Genus PLANOLITES Nicholson. 
Planolites sp. undt. 
Plate 1, 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: (86f) Fu-ch6u series; about 1,000 
feet (305 m.) above the white quartzite [see Blackwelder, 1907), 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 1, Figures 6, 6a. 
Iphidea (??) sculptilis MEEK, 1873, Sixth Ann. Rept. 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 Hau, and WHITFIELD, 1877, U. S. Geol. Expl. 40th Parallel, vol. rv, pt. 2, pp. 
207-208, plate 1, figs. 11 and 12. (Described and discussed as a new species. The specimens 
represented by figs. 11 and 12 are redrawn by Walcott, 1912, plate m1, figs. 55 and 5c.) 
Kutorgina sculptilis (Meek), WaLcott, 1884, Monogr. U.S. Geol. Survey, vol. vim, p. 20, plate, figs. 
7, 7a-b; plate 1x, fig. 7. (The specimens represented by figs. 7, 7a—), plate 1, and fig. 7, plate 
1X, are redrawn in this monograph, plate 11, figs. 5, 5b, and 5c.) 
Iphidea sculptilis Meek, ScHUCHERT, 1897, Bull. U.S. Geol. Survey No. 87,p.235. (Merely goes back 
to original generic reference.) 
Iphidea sculptilis Meek, WaucotT, 1899, Monogr. U. S. Geol. Survey, vol. xxxu, pt. 2, pp. 447-448, 
plate Lx, figs. 5, 5a-c. (Discussed. The specimen represented by figs. 5, 5a—-c is redrawn by 
Walcott, 1912, plate 111, fig. 5a.) 
Iphidella sculptilis (Meek), Watcort, 1905, Proc. U.S. Nat. Mus., vol. xxvuir, p. 308. (Merely changes 
generic reference.) 
Micromitra sculptilis (Meek), WaAucoTT, 1912, Monogr. U. S. Geol. Survey, vol. LI, pp. 341-342, plate 
ul, figs. 5, 5a-e. (Describes, discusses, and illustrates species.) 
