DESCRIPTION OF GENERA AND SPECIES. 129 
Formation and Locality—Middle Cambrian: (350) Fu-chéu series, shales about 
130 feet (40 m.) above the white quartzite [see Blackwelder, 1907), p. 92, for general 
section giving stratigraphic relations]; collected in drainage cuts a short distance 
back from the bluff [see 35n] forming the shore of Tschang-hsing-tau Island, east 
of Niang-niang-kung, Liau-tung, Manchuria, China. 
Collected by J. P. Iddings and Li San. 
Genus DREPANURA Bergeron. 
Drepanura BERGERON, 1899, Bull. Soc. géol. de France, 3d ser., vol. xxv, p.509. (Describes and 
discusses genus.) 
Drepanura Bergeron, MONKE, 1903, Jahrb. kénigl. Preuss. Geol. Landesanstalt und Bergakademie, 
vol. xx1, pt. 1, p. 124. (Discusses genus under the species D. premesnili Bergeron.) 
Both M. Bergeron and Doctor Monke united the description of the genus and 
the type species. Nothing has been added to our knowledge since Doctor Monke 
wrote his very full description of D. premesnili, the type of the genus. Doctor 
Monke described a second species, D. kettelert, which differs in the cranidium from 
that of D. premesnili in having the eye-lobes further back and in details of the 
glabella and free cheeks, also of the pygidium. [See plate ro, figs. 2, 2b, 3, 3a.] 
Genotype.—Drepanura premesnil1 Bergeron. 
Drepanura ketteleri Monke. 
Plate 10, Figures 3, 3a—c. 
Drepanura ketteleri MONKE, 1903, Jahrb. kénigl. Preuss. Geol. Landesanstalt und Bergakademie, vol 
XXII, pt. 1, p. 132, plate 6, figs. 1-14; plate 9, No. 5. (Described as a new species.) 
This species differs from Drepanura premesnili Bergeron by its strongly gran- 
ulated test, more convex glabella, the position of the eye-lobes, and many minor 
details of the cranidium. The pygidium is of the same type as that of D. premesnili, 
as may be seen by comparing figures 3a and 3c with 2b and 2c, plate 10. Doctor 
Monke has given a very elaborate description of all known parts and made extended 
comparisons with D. premesnilt. 
Formation and Locality—Middle Cambrian: (C6) Thin, platy limestone in 
the upper shale member of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 41 
(second list of fossils), and fig. 10 (bed 12), p. 38], 2.5 miles (4 km.) southwest of 
Yen-chuang, Sin-t’ai district, Shan-tung; also (C55), just below the Ch’au-mi-tién 
limestone in Ku-shan shales [idem, p. 43], in isolated hills at an elevation of 380 
feet (114 m.) above the Wén-ho, 12 miles (19 km.) south 80° east of Tsi-nan, Shan- 
tung, China. 
Collected by Bailey Willis and Eliot Blackwelder. 
Drepanura premesnili Bergeron. 
Plate 10, Figures 2, 2a—d; Plate 11, Figures 1-5. 
Drepanura premesnili BERGERON, 1899, Bull. Soc. géol. de France, 3d ser., vol. xxv, p. 509, plate 13 
fig. 8. (Species described and discussed.) 
Drepanura premesnili Bergeron, MONKE, 1903, Jahrb. kénigl. Preuss. Geol. Landesanstalt und 
Bergakademie, vol. xx, pt. 1, p. 124, plate 5, figs. 5-19; plate 9, No. 4. (Describes and 
discusses species very fully.) 
M. Bergeron founded this genus and species on the pygidia occurring on a 
thin slab of limestone. Subsequently Doctor Monke described in detail and illus- 
trated the cephalon, thoracic segments, and pygidia. Among the collections of the 
Carnegie Institution of Washington Expedition, fine illustrations of the cranidium, 
free cheeks, and pygidia occur, also fragments of the thoracic segments, but nothing 
is added except that the true stratigraphic position of the genus and species has 
