DESCRIPTION OF GENERA AND SPECIES. 205 



This species is the only one of the genus Anomacarella of which we have speci- 

 mens of the cephalon, thorax, and pygidium, with the exception of the compressed 

 dorsal shield of Atwmocarclla chincnsis [plate 20, fig. 411]. The cranidium differs 

 from that of the type of the genus, A. chincnsis [plate 20, fig. 3], in having a rel- 

 atively smaller palpebral lobe and twelve segments, instead of eight, in the thorax. 



Formation and Locality. Middle Cambrian: (90x) Conasauga formation, in 

 and attached to the outer surface of siliceous nodules in argillaceous shales, Coosa 

 Valley, east of Center, Cherokee County, Alabama. 



Collected by A. M. Gibson, 1884, and Cooper Curtice, 1885. 



Anomocarella speciosa (Lorenz). 



Plate 20, Figure 8. 



Anomocarc speciosum LORENZ, 1906, Zeitschr. deutsch. geol. Gesellsch., vol. LVIII, pt. 2, p. 77, 

 plate 5, figs. 6, 7. (Species characterized.) 



Doctor Lorenz compares this species with his Anomocarc commune [1906, p. 77] = 

 Dolichometopus deois Walcott [p. 216]. He states that the glabella has a faint ridge 

 passing along its median line and indistinct furrows, a small node on the occipital 

 ring, and that the associated pygidium is typical of the genus Anomocarc. 



On plate 20, figure 8, Anomocarella speciosa is illustrated by photographs of 

 the type specimen now in the collection of the University of Freiburg Museum. The 

 comparison of the cephala of figure 8 with the cephala illustrated by figures 3 

 and 4 of A. chinensis shows that they are very much alike, but that Anomocare 

 commune differs from Anomocarella chincnsis in details of the frontal limb and mar- 

 gin, the proportionately wider fixed cheeks of .4. chinensis, and more strongly 

 marked punctate surface. 



Formation and Locality. Middle Cambrian: Limestone at Wang-tschuang, 

 Shan-tung, China. 



Anomocarella subrugosa (Walcott). 



Plate 19, Figure 12. 



Ptychoparia (Liostracus) subrugosa WALCOTT, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 592. (Species 

 described and discussed essentially as below.) 



This species is represented by two specimens of the cephalon, exclusive of the 

 free cheeks. These portions of the cephalon are subrectangular in outline, strongly 

 convex. Glabella prominent, strongly convex, with its sides converging from a 

 width of 6.5 mm. at the base to 4 mm. at the front, in a glabella 6.5 mm. long, 

 exclusive of the occipital furrow and ring; front arched, with a shallow pit in the 

 dorsal furrow where the sides and front unite ; the glabella is marked by three pairs 

 of shallow, rather broad glabellar furrows, the posterior pair of which extends 

 obliquely inward and backward about one-third the distance across the glabella; 

 occipital furrow rounded and rather deep; occipital ring narrow and moderately 

 convex at the sides, gradually increasing in convexity and width toward the center, 

 where a small node occurs; dorsal furrow strong at the sides and in front of the 

 glabella. 



Fixed cheeks about half as wide as the glabella at its base, convex at the center, 

 and sloping gently backward to the posterior furrow and more abruptly downward 

 to the frontal limb ; palpebral lobes central and small ; palpebral ridge rather strong, 

 rounded, and extending from the anterior rim of the palpebral lobe obliquely forward 

 across the fixed cheek to a point just back of the pit at the antero-lateral angle of 

 the glabella; frontal limb of medium width, slightly convex, and passing into the 

 rounded furrow within the rounded, strong, convex frontal rim. 



