PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 883 
Horizon and locality—Murat formation in Virginia: Along the road and 
ridge 2 miles northwest of Lexington, vicinity of Whistle Creek, Lexington (15’) 
Quadrangle. 
Discussion —Although the interior of this species is not known, it is assigned 
to Glyptomena because its ornamentation is so much like that of Glyptomena. 
This is a large species, the largest so far assigned to the genus. It is therefore 
quite different from G. parvula and G. sculpturata which are much smaller. 
Glyptomena prisca is a moderately large species, but its shape is totally different 
from that of G. bella. 
GLYPTOMENA ? DISTANS (Raymond) 
Plate 231, B, figure 8 
Rafinesquina distans RAyMonp, Ann. Carnegie Mus., vol. 3, p. 575, 1906; idem, vol. 7, No. 2, 
p. 234, pl. 35, fig. 1, 1911. 
The ornamentation of this species suggests that of Glyptomena rather than 
Rafinesquina. 
Type.—Holotype: Carnegie Mus. 5452. 
Horizon and locajity—Crown Point formation in New York: At Crown 
Point, Port Henry (15’) Quadrangle. 
Valcour formation, in New York: On Valcour Island, Plattsburg (15’) 
Quadrangle. 
GLYPTOMENA ? MINGANENSIS (Twenhofel and Stiles) 
Strophomena alternata Bittincs (not Conrad), Canadian Nat. Geol., vol. 4, p. 443, 1859. 
Rafinesquina champlainensis minganensis Twenhofel and Stiles in TwENHOFEL, Geol. Soc. 
Amer. Special Pap. 11, p. 50, pl. 8, figs. 3-6, 1938. 
This species is doubtfully assigned to this genus on the basis of its ornamenta- 
tion. Possibly it is the young of a Macrocoelia, but this cannot be settled until 
interiors have been found or made. 
Horizon and locality—Mingan formation (lower 50 to 60 feet): In the 
Mingan Islands, St. Lawrence River. 
GLYPTOMENA PARVULA Cooper, new species 
Plate 245, A, figures 1-8 
Shell small for the genus, wider than long and with the hinge forming the 
widest part; sides nearly straight; anterior margin broadly rounded; surface 
costellate, the stronger costellae conspicuous in a mat of finer ones, the latter 
forming broad zones between the strong costellae. 
Pedicle valve strongly and evenly convex in lateral profile and with the maxi- 
mum convexity located at the middle; anterior profile strongly domed ; umbonal 
region strongly swollen; median region inflated; lateral and anterior slopes long 
and steep. Interarea fairly long. Interior with stout, nearly vertical dental plates ; 
muscle field with floor somewhat thickened and in length equal to about one- 
third the total shell length. 
