208 RESEARCH IN CHINA. 



Anomocarella thraso (Walcott). 



Plate 19, Figures 14, 140. 



Plychoparia (Ln^lrni ns\ Ikraso WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 85. (Species 

 described essentially as below.) 



Cephalon subquadrilateral in outline, exclusive of the free cheeks, strongly 

 convex. Glabella prominent, convex, sides straight and converging toward the front 

 from a width of 6 mm. at base to 4 mm. at front in a glabella 6.5 mm. long; front 

 arched, and with a pit in the furrow where the sides and front unite; three shallow, 

 broad furrows extend nearly to the center from each side, so as to divide the surface 

 into two narrow lobes a terminal lobe and a strong posterior lobe; occipital furrow 

 strong and arching forward at the center; occipital ring narrow at the sides and 

 gradually increasing in width to the center; dorsal furrow narrow and well defined. 



Fixed cheeks narrow; palpebral lobes central, and small; postero-lateral limbs 

 short and marked by a broad, strong furrow; palpebral ridges low, but clearly de- 

 fined ; frontal limb short, gently convex, and sloping into a strong, rounded furrow 

 within the rounded, narrow, prominent frontal rim. 



vSurface smooth under a strong lens. 



A cephalon 10 mm. in length has a width of 1 1 mm. at the eye-lobes. 



Formation and Locality. Middle Cambrian: ((?) Lower limestone member 

 of the Kiu-lung group [Blackwelder, 19070, pp. 37 and 39 (last list of fossils), and 

 fig. 8a (bed 33), p. 29], 2.2 miles (3.5 km.) southwest of Yen-chuang, Sin-t'ai district, 

 Shan-tung, China. 



Collected by Eliot Blackwelder. 



Anomocarella toxeus (Walcott). 



Plate 19. Figures 10, 100. 



Plychoparia (Lioslracus) toxeus WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 83. (Species 

 described as below.) 



Of this species only the central portions of the cephalon are known. The 

 glabella and fixed cheeks are rather strongly convex; glabella prominent, truncato- 

 conical, without furrows, except as indicated by a slight darkening of the surface 

 where the furows usually occur ; occipital groove narrow, but very distinct ; occipital 

 ring narrow at the sides, rounded, and of medium width at the center; dorsal furrow 

 strong, rounded, and marked by a slight pit at the antero-lateral angle of glabella. 



Fixed cheeks about one-half the width of the glabella at its base; palpebral 

 lobes small and situated about half way between the posterior and front margins; 

 palpebral ridges faintly defined ; frontal limb narrow, convex, and sloping downward 

 to a deep, rounded groove which rises in front to a strong, rounded frontal rim; 

 postero-lateral limbs about one-third longer than the width of the fixed cheeks; a 

 strong furrow extends the entire distance within the posterior margin. 



The surface under a strong lens appears to be smooth. 



The largest cephalon has a length of 6 mm., with a width of 7 mm. at the pal- 

 pebral lobes, exclusive of the free cheeks. 



This species may be compared with Anomocarella oweni [see Walcott, 18846, 

 p. 55, plate 10, fig. 3], a form that has a wide geographic distribution in the United 

 States, and also ranges from the Middle Cambrian into the Upper Cambrian of the 

 Eureka district of Nevada. 



Formation and Locality. Middle Cambrian: (C28) Thin-bedded oolitic lime- 

 stone at the base of the Ch'ang-hia limestone [Blackwelder, 19070, p. 32 (first list 

 of fossils) and fig. 6 (bed 20), p. 25], just above the shales in the face of the cliff, 

 i mile (1.6 km.) east-southeast of Ch'ang-hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



