696 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Types.—Holotype: 117256a; figured paratypes: 117254, 117255a, 117256b. 
Horizon and locality—Edinburg formation (top of the Liberty Hall facies) 
in Virginia: 4 mile south of Dunkard Church, 6.9 miles S. 80° W. of Natural 
Bridge, Natural Bridge (15’) Quadrangle. 
Edinburg formation (lower Nidulites zone) in Virginia: From a cut on U. S. 
Highway 11, Hupp Hill, 1 mile north of Strasburg, Strasburg (15’) Quadrangle. 
Martinsburg formation (=Salona) in Virginia: On Virginia Highway 617= 
910, 0.15 mile north of Green Mount Church, Broadway (15’) Quadrangle. 
Discussion.—This species is characterized by small size, and quadrate form. 
It is suggestive of C. sulcata but is less elongate and has a shorter and wider 
sulcus. The same features will distinguish it from C. parva. 
CYCLOSPIRA SULCATA Cooper, new species 
Plate 142, M, figures 60-69 
Shell small, pentagonal in outline, inequivalved ; lateral margins gently rounded 
but with distinct shoulders located slightly posterior to the middle ; greatest width 
at or slightly anterior to the shoulders. Front margin truncated. Surface smooth. 
Pedicle valve deep, evenly and moderately convex in lateral profile, strongly 
convex in adult forms with the greatest convexity shifted to the umbonal region. 
Median region strongly elevated and narrowly rounded to form a low fold; sides 
gently concave and diverging steeply to the margins. Anterior slope steep. 
Brachial valve shallow, moderately convex in lateral profile and with the maxi- 
mum curvature located at the front of the adult where the valve is geniculated 
to form a tongue which fits into the anterior folded part of the pedicle valve. 
Umbonal region slightly swollen; sulcus originating somewhat less than a third 
the length from the beak, broad, deepening anteriorly, and with rounded section. 
Flanks gently convex, narrow. 
Interior: Median septum of the brachial valve extending almost to the middle; 
descending processes of spire reaching nearly to front margin. 
Measurements in mm.— 
Length Width Thickness 
EPONA coy outed heard akan bin oerentia come eewa tae 4.8 4.3 27 
PA GALVIN chia tacit teehte actais «tease keds cuae Rare eae 4.6 3.7 2.0 
Types.—Holotype: 111395b; figured paratype: 111395a. 
Horizon and locality—Sevier formation in Tennessee: 1 mile southeast of 
Whitehorn, Bulls Gap (T.V.A. 171-SE) Quadrangle. 
Chatham Hill formation in Virginia: Grayson Farm, 4 miles southwest of 
Bland, Bland County. 
Discussion.—This species can be recognized by its broad and rounded sulcus 
in the brachial valve and the typically shouldered appearance of the pedicle valve. 
It is different from C. Jonga in lacking a strong fold in the sulcus and obscure 
costae on the flanks. Its differences from C. quadrata and C. parva are stated 
under the discussion of those species. 
