﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER II63 



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 Auburn chert (near top), Apex Station, C. B. and Q. RR., south of Elsberry, 

 Elsberry (15') Quadrangle, Mo. 



(4) Pedicle interior showing the elongate and subflabellate diductor scars, the nar- 

 row adductor track, and the short, flaring dental plates, X 2, hypotype, 117336a; 

 (6) brachial interior, X 2, showing flaring brachiophore supports, long-shafted 

 cardinal process and sockets, hypotype, 117336c; (7) same as the preceding, 

 X 2, tilted to show the brachial interarea, notothyrial cavity, myophore of the 

 cardinal process, brachiophores, and fulcral plates; (8) same as preceding, X 2, 

 tilted to side to show fulcral plates; (11) brachial interior tilted to show flaring 

 brachiophore plates, X ii, hypotype, ii7336d; (12) cardinalia of the preceding, 

 X 3, showing fulcral plate and brachiophores ; (9) another brachial interior, X 2, 

 showing the adductor scars and cardinalia, hypotype, 117336b; (10) same speci- 

 men as preceding, X 2, tilted to side to show fulcral plate, brachiophores and 

 their supporting plates. 



Barnhart formation, cut on U. S. Highway 61, 0.2 mile south of Koch Valley 

 School, near Barnhart, Kimmswick (15') Quadrangle, Mo. 



(5) Posterior part of brachial valve showing muscle scars, adductor track, and 

 apical plate, X 3, hypotype, Y.P.M. S1359; (13) thin section of part of pre- 

 ceding, ca. X 25, showing endopunctae. View shows punctae concentrated into 

 linear arrangement along the costellae. Photograph by L. G. Henbest. 



Decorah formation (Guttenberg member ?), St. Paul, Minn. 



Plate 157 

 Cristiferina, Dalmanella, Onniella, Paucicrura, Pionodema 



A. Onniella fertilis (Ulrich) 954 



(1) Portion of the type slab showing a cluster of specimens, Xi , type slab, 96362; 

 (2) part of preceding specimen, X2; (3) brachial and pedicle views of two 

 specimens on the same slab as preceding, X 2, paratypes, 96362c (brachial), 

 96362d (pedicle). 



Curdsville formation, Pennington Gap, Lee County, Va. 



B. Dalmanella rara Cooper, new species 949 



(4) Brachial interiors, X 3, paratype, 96362c, on slab above. 

 Horizon and locality same as preceding. 



C. Onniella fertilis (Ulrich) 954 



(5) Brachial interior, X 2, lectotype, 96362b; (6) pedicle interior, X 2, paratype, 

 96362a, both on above slab. 



Horizon and locality same as preceding. 



D. Pionodema subaequata ( Conrad) 992 



(7-11) Respectively brachial, posterior, side, anterior, and pedicle views of a com- 

 plete specimen, Xi, hypotype, 117335b; (12-14) pedicle, anterior, and side 

 views of a somewhat larger specimen than the preceding, X I, hypotype, 117335a. 

 The brachial view and X 2 enlargements of the pedicle and brachial valves 

 appear on pi. 156, A, figs. 1-3. 



Auburn chert (near top), Apex Station, C. B. and Q. RR. south of Elsberry, 

 Elsberry (15') Quadrangle, Mo. 



E. Cristiferina cristata Cooper, new species 962 



(15, 16) Brachial and pedicle views of an imperfect specimen, X 2, paratype, 

 117351a; (17) brachial interior, X 2, paratype, 117351c. 



Chatham Hill formation, Grayson Farm, 4 miles southwest of Bland, Bland 

 County, Va. 



F. Paucicrura rogata (Sardeson) 957 



(18-22) Respectively posterior, anterior, side, brachial, and pedicle views of a com- 

 plete specimen, X 2, figured specimen, 48701a; (23, 24) respectively X 2 and X 4 



