DESCRIPTION OI? GENERA AND SPECIES. 189 



pygidium, convex and narrowing gradually from the anterior margin to its termina- 

 tion ; it is crossed by from five to six shallow, transverse furrows that outline from 

 six to seven slightly convex rings and a terminal section; from the axial lobe the 

 surface of the pleural lobes slopes at first gently and then quite rapidly down for 

 about two-thirds of their width and then very gradually out to the margin. The}' 

 are marked by five or six broad furrows and rather broad, flattened ridges that are 

 the continuation on the pleural lobe of the transverse rings on the axial lobe; the 

 posterior margin curves more or less inward toward the median line so as to give 

 a slightly indented outline to the otherwise rounded curve of the sides and pos- 

 terior margin of the pygidium. 



Surface under a strong lens shows numerous pits or pores ; the free cheeks and 

 the cranidium in front of the glabella and palpebral ridges are beautifully marked by 

 irregular radiating ridges that branch quite irregularly and are united by irregular 

 cross-ridges so as to give an anastomosing effect. 



The dimensions are shown by the figures on plate 18, figures 3 and 30. 



The cranidium of this species is much like that of Anomocare Iccvc [plate 18, fig. 

 i]. Each has a broad, more or less concave frontal limb and margin marked by radi- 

 ating ridges, large eyes, and elongate glabella marked by five short lobes on each side. 



The pygidium in each species is of the same type and the surface has the same 

 punctate character in each. 



Anomocare convexa is associated with several other species of Anomocare. 



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

 and attached to the outer surface of siliceous nodules in the Conasauga (Coosa) 

 shales, Coosa Valley, east of Center. Cherokee County, Alabama. 



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



Anomocare daulis Walcott. 

 Plate 1 8, Figures 7, 70. 



Anomocare ? daulis WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 50. (Described as a new 

 species essentially as below.) 



Of this species the central portions of the cephalon, exclusive of the free cheeks, 

 and associated pygidium are known. Glabella rather strongly convex and faintly 

 marked by three pairs of furrows; it narrows slightly toward the rounded front; 

 occipital furrow narrow and curving slightly forward at the center; occipital ring 

 of medium and nearly uniform width from side to side ; dorsal furrow shallow and 

 rounded ; posteriorly the latter separates a narrow, elongated lobe from the side of 

 the glabella, and joins the occipital furrow; the narrow lobe mentioned extends 

 backward to the occipital furrow and laterally merges into the fixed cheek; from 

 another point of view the dorsal furrow might be considered to pass outside of the 

 narrow, elongate lobe, near the base of the glabella, and the furrow between the 

 glabella and the elongate lobe would then be an inner division of the dorsal furrow. 

 The surface of the glabella is somewhat irregular on account of the lateral furrows, 

 and on account of a rather rounded, broad, longitudinal ridge which extends its 

 entire length. 



Fixed cheeks less than half the width of the glabella ; they rise from the dorsal 

 furrow and merge into the large eye-lobe, and anteriorly are divided by the strong 

 palpebral ridge which passes into the strong palpebral lobe ; in front of the palpebral 

 ridge the cheeks slope downward to a second ridge which extends from the front line 

 of the glabella subparallel to the palpebral ridge as far as the facial sutures ; frontal 

 limb relatively long, slightly concave to the narrow, very slightly rounded rim ; pos- 

 tero-lateral limbs short and marked by a strong curve within the narrow posterior rim. 



