﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1 151 



Page 

 merits of a plasticine replica of the brachial interior, prepared from hypotype, 

 117425c 



Effna formation, McNutt Quarry, 12 miles southwest of Bland, Burkes 

 Garden (15') Quadrangle, Va. 



B. Sowerbyites lamellosus Cooper, new species 728 



(10, 11) Respectively X I and X 2 enlargements of a complete specimen, paratype, 

 117405a; (12, 13, 15) posterior, anterior, and side views, X h of the paratype; 

 (14) brachial view of another complete specimen, showing lamellae, X i» para- 

 type, 117405c; (17) pedicle view, X 1, of a paratype, H7405d; (16) brachial 

 view, X 1, of another complete specimen, paratype, 117405b; (18) interareas of 

 the preceding specimen, X 3, showing pseudodeltidium. 



Yellow limestone above 25-foot bed of Eureka group, saddle just north of hill 

 8167, Martins Ridge, Monitor Range, Roberts Mountains (i°) Quadrangle, 

 Nev. 



C. Sowerbyites hami Cooper, new species 727 



(19, 25, 26) Brachial, side, and anterior views, X 1, of the holotype, 117400a; 

 (20, 22-24, 33) respectively brachial, side, anterior, posterior, and pedicle views, 

 X 2, of the holotype; (27) posterior of holotype, X 3, showing deltidial and 

 chilidial structures; (21) brachial view of a paratype, X 2, H740of; (28) pedi- 

 cle interior, X 3, showing elongate muscle scars, paratype, 117400b; (29) 

 brachial interior, X I, paratype, U7400d; (31, 32) posterior and interior views 

 of the preceding, X 3, showing septa, pallial marks, and cardinalia; (30) an- 

 other brachial interior, X 3, showing the 3 septa characteristic of the genus, 

 paratype, U740oe. 



Bromide formation (Pooleville member), road cut on east side section-line 

 road, 1,300 feet south of the northwest corner sec. 23, T. 1 S. ,R. 3 E., Murray 

 County, Okla. 



Plate 182 

 Sowerbyites 



A. Sowerbyites subnasutus Cooper, new species 729 



(1) Interior of an imperfect pedicle valve showing the long diductor scars and the 

 callosities at their anterior ends, X 2, paratype, 111797a; (2, 5) respectively X 1 

 and X 2 enlargements of the brachial view of a complete specimen showing 

 traces of the lamellae, paratype, 98187a; (8) pedicle view, X I, of the preceding 

 specimen; (3, 6) respectively X 1 and X 2 enlargements of the brachial view of 

 a complete specimen, showing lamellae, paratype, ni797d; (9) pedicle view, 

 X I, of the preceding; (7) brachial view of another complete specimen, X l> 

 holotype, ni797g; (10) brachial exterior showing strong development of lamel- 

 lae, X 2, paratype, 98187b; (4) pedicle view of a specimen from which part of 

 the pedicle valve has been removed to show the septa of the brachial valve, X 3, 

 paratype, 98187c; (11) interior of the brachial valve, X 2, showing the septa 

 and cardinalia, paratype, 111797! 



Lincolnshire formation, Marcem Quarry, 2 miles west of Gate City on the 

 north side of U. S. Highway 58, Gate City (T.V.A. 188-NE) Quadrangle, 

 Va. 



B. Sozverbyites triseptatus (Willard) 730 



(12) Exterior from the brachial side and showing closely crowded lamellae, X 2, 

 hypotype, 111796c; (23) brachial interior showing septa, cardinalia, and cardinal 

 process, X 3, hypotype, 111796b; (22) side view of a brachial valve showing 

 swelling at the anterior end of the median septum, X I, hypotype, 111796c; 

 (17, 24, 28, 29) pedicle, brachial, posterior, and anterior views of a complete 



