592 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Horizon and locality—Ward Cove ? formation in Virginia: On Jeff Gilles- 
pie’s place in Thompson Valley, 14 miles southwest of Tazewell, Pounding Mill 
(15’) Quadrangle. 
Discussion—The position of this little species is uncertain. The specimens 
may represent the young of some Camerella, but they seem more like adults. The 
median fold is better developed than is usual in the young of Camerella. The 
specimens suggest N. ? gregaria but have a more pronounced fold and a more 
elongate outline. 
LIRICAMERA Cooper, new genus 
(Latin, lira, ridge between 2 furrows; camera, chamber) 
Biconvex, subcircular in outline, gently uniplicate; surface completely costel- 
late. Pedicle valve with moderately wide interarea. Pedicle interior with long 
spondylium supported by a long median septum. Brachial interior with a shallow 
cruralium like that of Camereila. 
Genotype.—Liricamera nevadensis Cooper, new species. 
This genus is clearly an early elaboration of Camerella which still retains some 
primitive characters. The interior details are like those of Camerella and need 
not be elaborated. The genus differs from Camerella in the completely costellate 
exterior, most Camerellas being smooth in the posterior third, half, or quarter, 
and strongly costate in the anterior part. It differs also in the possession of a 
fairly wide and well-developed interarea on both valves. Furthermore, the gen- 
tle degree of folding of the anterior commissure is another distinction from 
Camerella. 
The ornamentation actually suggests that of some species of [diostrophia in 
the median groove on one valve. At present this genus is known only from the 
Orthidiella zone of the Pogonip formation which contains many other peculiar 
brachiopods. The genus is thus a lateral branch of Camerella retaining primitive 
features. 
LIRICAMERA NEVADENSIS Cooper, new species 
Plate 110, H, figures 50-57; plate 122, A, figures 1-8 
Subcircular in outline, with all margins rounded ; beaks inconspicuous ; valves 
nearly equal in depth; anterior commissure gently uniplicate; surface costellate, 
costellae narrowly rounded, about 45 in number; brachial valve with a narrow 
median groove; pedicle valve with a corresponding median costella stronger than 
the surrounding ones, bifurcated at the front to receive a faint median costella. 
Pedicle valve strongly convex in lateral profile, strongly arched in anterior 
profile ; beak erect, incurved moderately ; umbonal and median regions swollen ; 
flanks swollen and with steep slopes. Median part of anterior third slightly de- 
pressed to form a faint sulcus. Spondylium deep and narrow; septum long. In- 
terarea well developed. 
Brachial valve slightly less convex than the pedicle valve in lateral profile; 
anterior profile strongly convex; entire valve swollen; lateral slopes steep; 
median region forming a faint fold. Midline marked by a narrow depression 
