PART I CHAZYAN AND RELATED BRACHIOPODS—-COOPER 817 
Horizon and locality.—Boulder in Mystic conglomerate in Quebec, Canada: 
In Range 6, Lot 20, Stanbridge Township, about 24 miles north of Mystic. 
Table Head series in Newfoundland: At Table Point and Table Point Cove. 
Discussion—This species is characterized by its geniculated anterior quarter 
and the fairly strong rugae. The irregularity and prevailing greater strength of 
the rugae and their tendency not to be curved or chevron shaped is a distinguish- 
ing feature of this species that will separate it from the Virginia shell. Some 
specimens of P. ? kindlei have few or no rugae in the anterior portions. Gener- 
ally the Virginia shell is completely rugose, although some specimens vary from 
this generality. The chief distinguishing character between the Canadian and 
Newfoundland species and P. virginiensis is the short and abrupt anterior genicu- 
lation toward the brachial valve. This feature is so strong that it seems necessary 
to question the generic assignment. This assignment is questioned also because 
the Canadian and Newfoundland specimens occur at a much earlier age (accord- 
ing to present views) than the Appalachian specimens. Furthermore, the interior 
details of P. ? kindlei are yet to be determined. The Table Head brachiopod 
assemblage is similar in appearance to that of the Botetourt of Virginia and 
Tennessee, but when their interior features are determined the Table Head 
forms have generally proved to be generically different from the Appalachian 
species which they resemble. 
PTYCHOGLYPTUS ? MATURA Cooper, new species 
Plate 174, C, figures 5, 6 
Large for the genus, wider than long, hinge forming the widest part; sides 
sloping gently toward the middle; anterior margin gently rounded. Posterior 
half rugose, anterior half marked by costellae of 2 sizes, distant strong costellae 
in a mat of fine radii, both covering the rugae as well as the anterior nonrugose 
shell. 
Pedicle valve fairly strongly convex in lateral profile and with the maximum 
convexity slightly anterior to the middle; anterior profile broadly convex; umbo 
narrowly convex, the convexity extended anteriorly for about one-third the 
length; median region moderately swollen, the swelling extending laterally and 
anteriorly so that the lateral and anterior slopes are short and moderately steep. 
Interior brachial valve unknown. 
Measurements in mm.—Holotype, length 17.6, midwidth 24.1, hinge width 
27.8+, surface length 19.7. 
Type.—Holotype: 111061. 
Horizon and locality—Pratt Ferry formation in Alabama: 0.2 mile south- 
east of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion.—This species is characterized by its partly rugose and partly 
nonrugose shell. Furthermore, the rugae are longer than usual in P. virginien- 
sis. The important character of this species is its large size, fairly strong con- 
vexity, and the fact that about the anterior half is nonrugose. It is possible that 
specimens of P. virginiensis will ultimately be found which will have a more 
