PART I CHAZYAN AND RELATED BRACHIOPODS—-COOPER 227 
same type of ornamentation and is thus assigned to Glyptoglossa. It also has a 
median septum in the brachial valve. This species does not show the usual plat- 
forms so characteristic of Lingulasma. 
GLYPTOGLOSSA CAVELLOSA Cooper, new species 
Plate 3, E, figures 13-20 
Shell elongate-oval, length about twice the width. Sides gently rounded; an- 
terior margin narrowly rounded, posterior bluntly pointed. Surface marked by 
crowded concentric undulations on the sides, but where these swing over the 
body of the shell they are scalloped. The overlapping of the scalloped lamellae 
creates a pock-marked appearance on the outer surface. 
Lateral profile moderately convex with the maximum convexity in the median 
region. Anterior profiles broadly convex. Anterior third of both valves some- 
what flattened. 
Measurements in mm.—Holotype (minus beaks), length 19.0+, width 10.2, 
thickness 4.0+. 
Types.—Holotype: 109273; figured paratypes: 109272a,d; unfigured para- 
types : 109272b,c. 
Horizon and locality—Shippensburg formation (Pinesburg member-lower 
part Echinosphaerites zone) in Maryland: On U.S. Highway 40, at Wilson, on 
the west side of the bridge over Conococheague Creek, 7 miles west of Hagers- 
town; same formation (lower part Nidulites zone), same as preceding; Wil- 
liamsport (15’) Quadrangle. At the same horizon in the railroad cut 2 miles 
southwest of Marion, Chambersburg (15’) Quadrangle. 
Discussion.—This species is characterized by the peculiar scalloping of the 
lamellae on the body of the shell, an ornamentation unlike that of any other 
species herein described. Paratype 109272d, a partially exfoliated brachial valve, 
shows an impression of a median ridge and the folded collar. 
GLYPTOGLOSSA sp. 1 
Plate 13, B, figure 4 
Two specimens are characterized by a peculiar ornamentation consisting of 
strong, concentric elevated lines with interspaces of about the same width as the 
lines. The elevated lines are crowded on the posterolateral slopes but are more 
distantly spaced on the median and posteromedian areas. The known specimens 
indicate a small linguloid having a length of about 11 mm. and a width of about 
7mm. The known valves are shallow, and the outline is the characteristic oval 
of many Ordovician linguloids. 
Figured specimen.—116770. 
Horizon and locality—Effna formation in Virginia: McNutts Quarry, 12 
miles southwest of Bland, Burkes Garden (15’) Quadrangle. 
Chatham Hill formation in Virginia: On the Grayson Farm, 4 miles south- 
west of Bland, Bland County. 
