DESCRIPTION OF GENERA AND SPECIES. 21 7 



I find in the large series of specimens in our collections that the test is finely 

 punctate as in Anomocare, but that in others it is not possible to observe the punctse. 

 This is especially true of the specimens that have been compressed in the limestone. 

 One of the specimens of the cephalon of this species, described by Lorenz as Bathy- 

 nriscus asiaticus [see plate 22, fig. 2a], shows both smooth and punctate surface, 

 according to the condition of preservation. 



Formation and Locality. Middle Cambrian: ((! and C2) Lower shale member 

 of the Kiu-lung group [Blackwelder, 19070, pp. 37 and 40 (part of the third list of 

 fossils), and fig. 10 (beds 4 and 5), p. 38], 2 miles (3.2 km.) south of Yen-chuang, 

 Sin-t'ai district, and (04) limestone nodules at the base of the lower shale member 

 of the Kiu-lung group [idem, second list of fossils], 3 miles (4.8 km.) southwest of 

 Yen-chuang, Sin-t'ai district, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Also from Locality ('19, uppermost layers of the Ch'ang-hia limestone [Black- 

 welder, 19070, p. 33 (part of last list of fossils)], at Ch'ang-hia, Shan-tung, China. 



Collected by Li San. 



Also from Locality C57, limestone nodules in the lower shale member of the 

 Kiu-lung group [Blackwelder, 19070, pp. 37 and 40 (first list of fossils)], 3 miles 

 (4.8 km.) south of Kao-kia-p'u, and 4 miles (6.4 km.) north of Sin-t'ai-hien, Sin-t'ai 

 district, Shan-tung, China. 



Also from localities: (35o) Fu-chou series, shales about 130 feet (40 m.) above 

 the white quartzite [see Blackwelder, 19076, p. 92, for general section giving strati- 

 graphic relations] collected in drainage cuts a short distance back from the bluff 

 forming the shore of Tschang-hsing-tau Island; (35 p), shales about 80 feet (24 in.) 

 above the white quartzite [see idem], and (35 r) limestones near the base of the 

 series just above the white quartzite [see idem], the latter two 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. 



Dolichometopus derceto Walcott. 



Plate 22, Figures 4, 40. 



Dolichometopus derceto WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 95. (Described as a new 

 species as below.) 



This species is known only by the central portions of the cephalon, exclusive 

 of the free checks. Glabella moderately convex and expanding slightly in width 

 from the base to the rounded front; the surface is marked by two pairs of rather 

 strong, short furrows opposite the palpebral lobe ; occipital furrow strong and rather 

 deep; occipital ring narrow at the sides, rising and widening to form the base for 

 a small, sharp occipital spine; dorsal furrow strong on the sides of the glabella. 



Fixed cheeks narrow, convex; palpebral lobe narrow, elongate, almost touching 

 the dorsal furrow in front ; postero-lateral limb of medium length, marked by a strong 

 furrow parallel to the posterior margin ; frontal limb narrow, slightly concave, and 

 almost concealed by the overhanging, almost tumid frontal portion of the glabella. 



Surface smooth under a strong lens. 



The largest of the three cephala representing this species has a length of 7 mm., 

 exclusive of the occipital spine. 



Formation and Locality. Middle Cambrian: ((.' I and C2) Lower shale member 

 of the Kiu-lung group [Blackwelder, 19070, pp. 37 and 40 (part of the third list of 

 fossils), and fig. 10 (beds 4 and 5), p. 38], 2 miles (3.2 km.) south of Yen-chuang, 

 Sin-t'ai district, Shan-tung, China. 



Collected by Eliot Blackwelder. 



