﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1 243 



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E. Rafinesquina trentonensis (Conrad) 888 



(17) Pedicle views of three specimens showing the characteristic ornamentation, 

 X I, figured specimen, 123282. 

 Trenton limestone, Trenton Falls, Remsen (15') Quadrangle, N. Y. 



Plate 267 

 colaptomena 



A. Colaptomena leptostrophoidca Cooper, new species 890 



(1) Exterior of the pedicle valve, X 1, paratype, 117763c; (2-4) pedicle, brachial, 

 and posterior views of a complete specimen, X 1, holotype, 117761 ; (5) another 

 pedicle exterior, X I, paratype, 117762a; (6, 7) respectively X 1 and X2 en- 

 largements of the exterior of a pedicle valve showing the ornamentation, para- 

 type, 117763a; (8) enlargement of part of the preceding, X 4, showing fine 

 lines between the larger costellae ; (9) impression of the pedicle interior show- 

 ing the large muscle area and the pallial marks, X ii, paratype, 117762c; (10) 

 imperfect brachial interior, X i, showing muscle area, paratype, 117763b. 



Martinsburg formation (part with Brongniartella and referable to the Salona 

 formation), on Virginia County Road 617 = 910, 0.15 mile north of Green 

 Mount Church, Broadway (15') Quadrangle, Va. 



Plate 268 

 Dinorthis, Fascifera, Oligorhynchia, Opikina, Plectocamara, Ptychoglyptus, 



SOWERBYELLA, StENOCAMARA, XeNAMBONITES, ZyGOSPIRA 



A. Sowerbyclla sp. 1 802 



(1, 2) Respectively anterior and brachial views of a complete specimen, X 2, 

 figured specimen, 117544a. 



Bromide formation (Mountain Lake member), 68 to 84 feet above the basal 

 sand, Spring Creek, sec. 17, T. 2 S., R. 1 W., Murray County, Okla. 



B. Fascifera convexa Cooper, new species 999 



(3-5) Respectively brachial, pedicle, and anterior views of an imperfect specimen 

 showing slots of dental plates and size of delthyrial cavity, X 2, holotype, 

 117303a; (6) pedicle view, X 2, of a paratype, 117303c. 



Benbolt formation, roadside 1.6 miles northeast of Heiskell, Powell Station 

 (T.V.A. 137-SE) Quadrangle, Tenn. 



C. Plectocamara rotunda Cooper, new species 600 



(7-1 1 ) Respectively anterior, side, pedicle, posterior, and brachial views, X 2, of 

 the holotype, 117186a. 



Chatham Hill formation, 1.2 miles S. 31° E. of Sharon Springs, Burkes 

 Garden (15') Quadrangle, Va. 



D. Ptychoglyptus virginiensis Willard 818 



(12-15) Respectively posterior, side, brachial, and pedicle views of a nearly perfect 

 specimen, X 3, hypotype, 123285^ showing ornamentation well, chilidial plates, 

 and simple cardinal process. 



Pratt Ferry formation, 0.2 mile southeast of Pratt Ferry, Blocton (15') Quad- 

 rangle, Ala. 



E. Opikina sp. 5 9-5 



(16-19) Respectively brachial, anterior, side, and pedicle views of a large indi- 

 vidual, X 1, figured specimen, 123292a; (20) exterior of a brachial valve having 

 a wide hinge, X 1, figured specimen, 123292c; (21) impression of the interior 

 of the pedicle valve showing the muscle scars, X i. figured specimen, I23292d ; 



