﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER IO39 



Page 

 Highway n, | miles southwest of Lacey Springs, Broadway (15') Quadrangle, 

 Va. 



H. Conotreta rusti Walcott 254 



(41) Anterior view of an exfoliated pedicle valve showing the pallial trunks, X 4, 

 lectotype, 18443a. 

 Trenton limestone, Trenton Falls, N. Y. 



Plate 17 

 Ephippelasma, Conotreta 



A. Ephippelasma minutum Cooper, new species 261 



(1, 3) Side view of a complete individual with the anterior portion broken away to 

 show the saddle-shaped plate in place, X2o(ca.), holotype, 116821a; (2) same 

 specimen, X 10, before the side was broken; (4) side view of a complete speci- 

 men, ca. X 8, paratype, 116821b; (5) posterior view of a pedicle valve, ca. X 20, 

 showing the tiny apical foramen, paratype, 116821c; (6) posterior view of an- 

 other pedicle valve, X 8, paratype, n682id; (7) exterior of the brachial valve, 

 ca. X 20, paratype, n682ie (specimen lost) ; (8) interior of the brachial valve 

 showing the peculiar saddle-shaped plate, ca. X 20, paratype, n682if ; (12) ante- 

 rior view of the interior of the same brachial valve showing saddle-shaped plate 

 from below, ca. X 10; (9) interior of the brachial valve with part of pedicle 

 valve still in place and showing position of saddle-shaped plate, ca. X 20, para- 

 type, 1 1 6821 g; (10, 11) broken specimen seen from the side and showing saddle- 

 shaped plate in relation to the pedicle valve, respectively ca. X 20 and X 10, para- 

 type n682ih; (13, 14) side and posterior views of the interior of the brachial 

 valve showing saddle-shaped plate in profile and from above, ca. X JO. paratype, 

 Ii682ii. 



Pratt Ferry formation (lower 3 feet), 0.2 mile southeast of Pratt Ferry, 

 Blocton (15') Quadrangle, Ala. 



B. Conotreta apicalis Cooper, new species 249 



(15-18) Respectively apical, posterior side, and anterior views of a pedicle valve, 

 X 4, holotype, 116813a; (19-20) side, posterior, and apical views of another 

 pedicle valve smaller than the preceding, X 4, paratype, 116813b; (21, 22) inte- 

 rior and exterior of a brachial valve, X 4, paratype, 116813c; (23, 24) side and 

 interior views of a brachial valve showing median septum, X 4, paratype, 

 116813d; (25, 26) brachial interior and same tilted to the side to show the 

 median septum, X 4, paratype, 116813c; (27) interior of another brachial valve 

 showing muscle scars, X 4, paratype, Ii68i3f; (28) brachial interior showing 

 muscle scars, X 4, paratype, Ii68i3g. 

 Horizon and locality same as preceding. 



C. Conotreta depressa Cooper, new species 251 



(29-31) Respectively posterior, side, and exterior views of an imperfect pedicle 

 valve, X 2, paratype, 116815a; (32-34) respectively exterior, side, and posterior 

 views of another pedicle valve, X 4, paratype, Ii68i5g; (35, 36, 27) stout, small 

 pedicle valve referred to this species doubtfully, X 4, figured specimen, 11 7967; 

 (38) interior of a pedicle valve showing the pallial markings, X 3, paratype, 

 Ii68i5d; (39, 40) respectively X 2 and X 4 views of a pedicle interior showing 

 apical callosity, muscle scars, and pallial marks, holotype, 116815c; (41, 42) the 

 same interior in normal view, X 2 and X4; (43) interior of the pedicle valve 

 showing callosity at apex, X 4, interior of paratype, 116815a; (44) interior of 

 an imperfect pedicle valve showing the apical callosity and pallial marks in ex- 

 ceptional detail, X 4, paratype, n68i5f; (45) exterior view of a pedicle valve, 

 X 2, paratype, 116815b; (47-49) exterior, tilted, and interior views of an- 



