PART. T CHAZYAN AND RELATED BRACHIOPODS—-COOPER 819 
rangle; McNutt Quarry, 12 miles southwest of Bland, Burkes Garden (15’) 
Quadrangle; Grayson Farm, 4 miles southwest of Bland, Bland County. 
Edinburg formation (Liberty Hall facies) in Virginia: 1.8 miles S. 4° W. of 
Bethel Church, 5.9 miles due east of Harrisonburg, Harrisonburg (15’) Quad- 
rangle. 
Botetourt formation in Virginia: At the junction of Virginia Highways 731 
and 724, 2 miles northeast of Brownsburg, Lexington (15’) Quadrangle. 
Edinburg formation (Cyrtonotella zone) in Virginia: In the ravine on the 
south side of the tracks at the switch 4 mile east of Strasburg Junction, Strasburg 
(15’) Quadrangle. 
Effna formation in Tennessee: On the south side of Tennessee Highway 66A, 
4 mile northeast of St. Clair, Bulls Gap (T.V.A. 171-SE) Quadrangle. 
Pratt Ferry formation in Alabama: 0.2 mile southeast of Pratt Ferry, Blocton 
(15’) Quadrangle. 
Discussion.—This species is one of the most beautifully sculptured brachiopods 
occurring in Ordovician rocks. It is readily recognized by its strong, often 
chevron-shaped rugae over which costellae of 2 sizes undulate. This species is 
variable, but generally the shell is fairly small and is not known to be geniculated. 
In the latter respect it differs markedly from P. ? kindlei. It differs from P. ? 
matura is size, convexity, and the fact that P. ? matura has at least half of the 
anterior part of the shell nonrugose. 
The ornamentation of P. virginiensis is somewhat variable. The variability 
is seen chiefly in the rugae which are of different sizes. Some of them are long 
and extend between 2 distant large costellae, others are short and extend between 
closely spaced large costellae. No uniformity was noticed by means of which 
finely rugose and coarsely rugose specimens could be separated into species or 
subspecies. 
Generally the rugae cover the entire shell from beak to anterior and lateral 
margins. A few specimens, however, are not completely rugose. Such is the 
type specimen of P. pulchrus (Butts). At the same locality numerous specimens 
were found which conform closely to P. virginiensis and others which are inter- 
mediate in character between the two. It was thought best, therefore, to sub- 
merge Butts’ species in the synonomy of P. virgimiensis. 
PTYCHOGLYPTUS ? sp. 1 
Three specimens from the Mystic conglomerate in Quebec on Range 6, Lot 21, 
indicate a species quite unlike P. ? kindlet. This is a finely and completely rugose 
species. It is wider than long and with a wide hinge. The brachial valve only 
is known, and it is moderately and evenly concave. The valve is not geniculated 
at the anterior. 
Measurements in mm.—1232992, length 9.1, midwidth 15.3, hinge width 18.4. 
Described specimens.—123299a-c. 
Horizon and locality.—Mystic conglomerate in Quebec, Canada: On Range 6, 
Lot 21, 2.6 miles due north and 4 mile east of Mystic, Stanbridge Township. 
