DESCRIPTION OF GENERA AND SPECIES. 93 
In the slope of the sides toward the apex, character of surface, and the trans- 
verse section this species may be compared with Hyolithes princeps Billings [Walcott, 
1891a, p. 621, plate 76, figs. 1, ra—l| of the Lower Cambrian of Newfoundland, H. 
tenuistriatus Linnarsson [1871b, p. 792, plate 16, figs. 4-9] and H. arenophilus Holm 
[1893, p. 71, plate 1, figs. 78-81; plate 2, figs. 1-2]. Hvyolithes cybele is, however, much 
smaller than the first two species mentioned, and its section is much more convex, 
both on the dorsal and ventral sides, than that of H. arenophilus Holm. 
Formation and Locality —Middle Cambrian: (C1 and C2) Lower shale member 
of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 4o (part of the third list 
of fossils), and fig. 10 (bed 4), p. 38], 2 miles (3.2 km.) south of Yen-chuang, Sin-t’ai 
district, Shan-tung, and (C62) earthy layer in the middle limestone of the Kiu- 
lung group [idem (last list of fossils), and fig. 10 (base of bed 7), p. 38], 2.5 miles 
(4 km.) south of Yen-chuang, on the north-northeast spur of Hu-lu-shan, Sin-t’ai 
district, Shan-tung; also (C4), limestone nodules at the base of the lower shale mem- 
ber of the Kiu-lung group [idem (second list of fossils), and fig. 10 (bed 4), p. 38], 
3 miles (4.8 km.) southwest of Yen-chuang, Sin-t’ai district, Shan-tung, and (C22) 
Ch’ang-hia limestone in upper oolitic portion [idem, pp. 22 and 33 (part of last list of 
fossils)], at Ch’ang-hia, Shan-tung, China. 
Collected by Eliot Blackwelder [with exception of (C62), collected by Li San]. 
In Manchuria beautifully preserved specimens of H. cybele occur in a limestone 
associated with Hyolithes glaber Walcott. 
Formation and Locality.—Middle Cambrian: (35n and 35r) Fu-chéu series; 
limestones near the base of the series just 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. 
Hyolithes daphnis Walcott. 
Plate 5, Figure 17. 
Hyolithes daphnis Wacort, 1905, Proc. U.S. Nat. Mus., vol. xx1x, p. 18. (Described and discussed as 
a new species essentially as below.) 
The type and only specimen of this species in the collection has a length of 
26 mm., with a width at the larger end on the dorsal side of 11 mm., and a dorso- 
ventral thickness of 9mm. Ata distance of 21 mm. from the larger end the smaller 
end has a width of 5 mm. on the dorsal side. Nothing is known of the outer surface. 
The section shows a very strongly convex ventral side, with rounded ventral angle; 
the dorsal side is gently convex, with the lateral angle slightly rounded. 
This species is represented by a cast that might have been taken from some of 
the more convex specimens of Hyolithes princeps Billings,’ of the Lower Cambrian 
rocks of Newfoundland. It differs from these in the more convex dorsal side. 
Formation and Locality—Middle Cambrian: (C64) Upper limestone member 
of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 42 (first list of fossils), and 
fig. 10 (bed 20), p. 38], 2.7 miles (4.3 km.) southwest of Yen-chuang, Sin-t’ai district, 
Shan-tung, China. 
Collected by Eliot Blackwelder. 


1Tenth Ann. Rept. U. S. Geol. Survey, 1890, p. 621, plate 76, figs. 1, 1a—/. 
