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, 

 18910, p. 621, plate 76, figs, i, ia-l] of the Lower Cambrian of Newfoundland, H. 

 tcnuistriatns Linnarsson [1871?', p. 792, plate 16, figs. 4-9] and H. arenophilus Holm 

 [1893, p. 71, plate i, figs. 78-81 ; plate 2, figs. 1-2]. Hyolithes cybeleis, 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: (Cl and 02) Lower shale member 

 of the Kiu-lung group [Blackwelder, 19070, pp. 37 and 40 (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 (062) 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 (04), 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 (022) 

 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 (0(52), collected by Li San]. 



In Manchuria beautifully preserved specimens of H. cybele occur in a limestone 

 associated with Hyolithes glabcr Walcott. 



Formation and Locality. Middle Cambrian: (35 n and 35 r) Fu-chou series; 

 limestones near the base of the series just 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. 



Hyolithes daphnis Walcott. 



Plate 5, Figure 17. 



Hyolithes daphnis WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, 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 1 1 mm., and a dorso- 

 ventral thickness of 9 mm. At a 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, 1 of the Lower Cambrian 

 rocks of Newfoundland. It differs from these in the more convex dorsal side. 



Formation and Locality. Middle Cambrian: (064) Upper limestone member 

 of the Kiu-lung group [Blackwelder, 19070, 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. 



'Tenth Ann. Kept. U. S. Geol. Survey, 1890, p. 621, plate 76, figs, i, ia-l. 



