DESCRIPTION OF GENERA AND SPECIES. 215 



eye-lobe characteristic of Anomocare lave [plate 18, fig. i] the type of the genus 

 Anomocare. I think that in all probability, with the securing of entire specimens of 



C. (?) limbata, the species will be found to have characters intermediate between 

 Coosia and Anomocare. For the present, however, I will refer it to the genus Coosia, 

 subgenus undetermined. 



Formation and Locality. Middle Cambrian: (91) Conasauga (Coosa) shales, 

 at Cedar Bluff, Cherokee County, Alabama; (10) limestones in Conasauga (Coosa) 

 shales, Blountsville Valley, Blount County, Alabama; and (107) limestone in Bull 

 Run, northwest of Copper Ridge [Keith, 1896, areal geology sheet], n miles (17.6 

 km.) northwest of Knoxville, Knox County, Tennessee. 



Collected by A. M. Gibson and Cooper Curtice. 



Genus DOLICHOMETOPUS Angelin. 



Dolichometopus ANGELIN, 1854, Palsontologia Scandinavica, pt. I (ed. 1878), p. 72. 

 Am photon LORENZ, 1906, Zeitschr. deutsch. geol. Gesellsch., vol. LVIII, pt. 2, p. 75. 



This genus is represented in China by several species. One of them, D. deois 

 [plate 21, figs. 13, i^a-d; plate 22, figs, i, la-h, 2, 2a-b], is very abundant in the form 

 of dismembered parts of the dorsal shield ; no entire specimens are known. Doctor 

 Lorenz [1906, pp. 75-76] defines a new genus and species, Am photon stcinmanni, on 

 a broken cranidium of medium size and a small cranidium [Lorenz, 1906, plate iv, 

 figs. 15-17]. Comparing his type specimens directly with the type specimen of 



D. deois shows them to be identical. The test in some specimens is minutely punc- 

 tate and on others it appears to be smooth and without punctae. 



Dolichometopus alceste Walcott. 



Plate 22, Figures 3, 306. 



Dolichometopus alceste WALCOTT. 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 94. (Species described as 

 below. ) 



This species occurs at the same locality as D. deois [p. 216], but not in the same 

 bed of limestone. It differs from D. deois in having a much more convex glabella 

 with nearly parallel sides. Glabella marked by a posterior pair of furrows, extend- 

 ing inward and backward so as nearly to cut off a small, subtriangular lobe at the 

 base of the glabella, also three pairs of short, faintly impressed furrows that extend 

 in at right angles to the side of the glabella; occipital furrow and ring unknown; 

 dorsal furrow shallow, but well defined. 



Fixed cheeks very narrow ; they slope down into the strong furrow just within 

 the narrow palpebral lobe and anteriorly slope down to the frontal limb ; the rim of 

 the palpebral lobe crosses the narrow front cheek, forming a very short palpebral 

 ridge; frontal limb short, nearly flat. 



The exterior surface, under a strong lens, shows a few fine, scattered punctules. 

 The inner surface of the frontal limb, where exposed by a breaking away of a portion 

 of the shell, is strongly punctate. 



The only specimen of the glabella of this species has a length of 12 mm., with a 

 width at the palpebral ridges of 8 mm. ; the frontal limb has a length of 1.5 mm. 



Formation and Locality. Middle Cambrian: (C4) In limestone nodules at the 

 base of the lower shale member of the Kiu-lung group [Blackwelder, 19070, pp. 

 37 and 40 (second list of fossils), and fig. 10 (bed 4), p. 38), 3 miles (4.8 km.) south 

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



Collected by Eliot Blackwelder. 



