PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 415 
Quarry, 3 miles south of Ragland, St. Clair County; junction of Cahaba Valley 
road with Bailey Gap road, SW4SW3 sec. 13, T. 19 S., R. 2 W., 13 miles north- 
east of Newhope Church, Vandiver (15’) Quadrangle. 
Discussion ——This species is characterized by its subquadrate form, crowded 
costellae, and the strength of the fold and sulcus. It is suggestive of V. austrina 
from which it differs in its more concave pedicle valve, stronger pedicle fold, 
and much deeper sulcus. 
This species also resembles V’. brevicarinata which occurs at about the Little 
Oak equivalent in Tennessee (Arline formation) but differs in its stronger fold 
and sulcus and the more oblique lateral margins. It is also similar to V. semi- 
carinata but differs in its stronger costellation, stronger fold and sulcus, and 
more robust form. 
VALCOUREA sp. 
As usual with any large collection a number of specimens cannot be placed in 
hitherto described species or in any of the new ones figured here. All the speci- 
mens are fairly large forms mostly poorly preserved. 
Valcourea sp. 1 (pl. 73, E, figs. 26, 27): This is a very poorly preserved 
specimen (110203a) with a length of about 20 mm.; preserving only a trace of 
the usual carinate fold and with a strong sulcus at the front of the pedicle valve 
producing a nasute anterior. The brachial valve is strongly convex and has a 
narrowly pinched-up fold at the front. The specimen measures 26 mm. in width 
but is not complete on either side and must have been much wider. A smaller 
specimen (110203b) in the same lot measures: 16 mm. in length by 23.3 mm. 
The specimens were taken from the Lincolnshire formation in the Marcem 
Quarry, 2 miles west of Gate City, Gate City (T.V.A. 188-NE) Quadrangle, Vir- 
ginia. Figured specimen: 110203a. 
Valcourea sp. 2 (pl. 73, D, figs. 23-25): Two pedicle valves, 110204 and 
110257, of an unusually large and thick-shelled species, suggestive of Campy- 
lorthis, represent an undescribed species. However, a trace of a pseudodeltidium 
is preserved and a thickened subperipheral rim is present, features that link the 
specimens to Valcourea. The other and most striking feature of these specimens 
is the large size of the muscle area which in specimen 110257 extends anteriorly 
from the beak for two-thirds the length and occupies nearly a fourth of the inner 
area. Furthermore, the thickened, dichotomous proximal ends of the pallial 
trunks are well preserved. Specimen 110204 measures: Length 15.6 mm., width 
20 mm., hinge width 26 mm. The specimens were taken from the Lincolnshire 
formation at Marble Bluff, 8 miles west-northwest of Loudon, Loudon (30’) 
Quadrangle, Tennessee. Specimens of Multicostella from this locality are also 
very thick shelled. Figured specimen: 110257. 
Valcourea sp. 3: This is represented by a lot of three specimens (110256) of 
a finely costellate species having a well-marked carinate pedicle fold and a nar- 
row, deep brachial sulcus. The specimens suggest V. austrina but are more finely 
ornamented. They also have some resemblance to V. deckeri but are too poorly 
