﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER II93 



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 (16) posterior view of the preceding, X 8, showing the cardinal process and 

 associated structures. 

 Horizon and locality same as A above. 



D. Xenambonites undosus Cooper, new species 815 



(17-20) Respectively posterior, anterior, pedicle, and brachial views of a com- 

 plete but young specimen, X 5, paratype, H7468f; (21-24) exterior, posterior, 

 interior, and side views of the pedicle valve showing the deflected flange on the 

 shell border, horizontal wrinkles on the exterior, and small Leptellina-like 

 muscle scars, X 4, paratype, 117468a; (25) exterior of the brachial valve, X 4, 

 holotype, 1 17468b; (26, 27, 29) brachial interior in three views; tilted to show 

 visceral disk plate, normal view showing inner border and posterior view, X 4, 

 all of the holotype; (28, 30) interior and posterior views of the brachial interior 

 showing the small disk area and the cardinalia, X 6, holotype ; (31 ) another 

 brachial interior, X 6, showing the disk region. This specimen was broken 

 irretrievably when it was photographed. 

 Horizon and locality same as A above. 



E. Toqnimia kirki Ulrich and Cooper 698 



(32) Impression of the pedicle interior showing the flabellate muscle scars and 

 numerous pallial marks, X li, hypotype, 117567^ 



Upper Pogonip group (lower Rhysostropliia bed), about 1 mile above the 

 mouth of Ikes Canyon, Toquima Range, Roberts Mountains (1°) Quadrangle, 

 Nev. 



F. Idiospira panderi (Billings) 691 



(33-37) Respectively pedicle, anterior, side, posterior, and brachial views of a com- 

 plete specimen, X I, hypotype, 85329a. 



Tyrone formation, 2 miles south of High Bridge, Harrodsburg (30') Quad- 

 rangle, Ky. 



G. Idiospira ? warthim Cooper, new species 692 



(38-41) Respectively pedicle, anterior, side, and brachial views of a complete 

 specimen, X i> paratype, 117252a. 



Wappinger formation, railroad cut at Pleasant Valley, 6 miles northeast of 

 Poughkeepsie, Poughkeepsie (15') Quadrangle, N. Y. 



H. Idiospira panderi (Billings ) 691 



(42-46) Respectively anterior, posterior, side, pedicle, and brachial views of a 

 large and complete specimen, X 1, hypotype, 117251a. 

 Hull formation, Kirkfield, Ontario, Canada. 



Plate 196 

 sowerbyella 



A. Sowerbyella varicostellata Cooper, new species 799 



(1-5) Respectively pedicle, side, posterior, anterior, and brachial views, X 2, 

 of the holotype, 117532a; (6, 7) pedicle interiors, X 2, paratypes, 117532c, 

 H7532d; (8) interior of an imperfect brachial valve, X 2, paratype, 117532b. 

 Arline formation (middle), north side of wagon road in glade, \ mile south- 

 east of Friendsville, Concord (T.V.A. 138-SW) Quadrangle, Tenn. 



B. Sowerbyella sp. 4 803 



(9-13) Respectively anterior, pedicle, brachial, side, and posterior views of a com- 

 plete specimen, X 2, figured specimen, 117548a; (14) brachial view of another 

 complete specimen, X 2, figured specimen, 117548b. 



Yellow shaly limestone above 25-foot sandstone of Eureka group, saddle just 

 north of hill 8167, Martins Ridge, Monitor Range, Roberts Mountains (i°) 

 Quadrangle, Nev. 



