﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER I24I 



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 Platteville formation (McGregor member), Minneapolis, Minn. 

 (6, 7) Respectively X 1 and X 2 views of an imperfect brachial valve showing 

 the cardinalia, hypotype, 123280. 



Platteville formation, ii miles northeast of Dixon, Dixon (15') Quadrangle, 

 111. 



B. Trigrammaria wilsonae Cooper, new species 875 



(10-14) Respectively brachial, anterior, posterior, pedicle, and side views, X 1, of 

 the holotype, H77S3; (15, 16) exterior of the pedicle and brachial valves, X 2, 

 showing ornamentation. 



Rockland formation (Napanee member), on New York Highway 12, on the 

 south side of the Sugar River, 4^ miles south-southeast of Port Leyden, Port 

 Leyden (15') Quadrangle, N. Y. 



C. Strophomena aubumensis Fenton 928 



(17-21) Respectively brachial, posterior, anterior, side, and pedicle views of a 

 large and perfect individual, X 1, hypotype, 1 17702; (22) enlargement of ante- 

 rior of pedicle valve, X 2, of same specimen. 



Decorah formation (Guttenberg member) (0 to 8 feet above the 8-inch blue 

 clay on top of the Platteville), on Wisconsin Highway 81, 0.1 mile south of the 

 Little Platte River, 2 miles northwest of Platteville, Mineral Point (30') 

 Quadrangle, Wis. 



Plate 264 



Strophomena 



A. Strophomena anamala Cooper, new species 927 



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

 the holotype, 117700a; (6) brachial view, X 1, of the holotype; (7-9) brachial, 

 side, and pedicle views of a complete specimen, X 1, paratype, 117701c; (10) 

 brachial view, X 2, of the preceding; (11) brachial view of another complete 

 specimen, X 2, paratype, H770id; (12) enlargement of the brachial posterior 

 showing ornamentation and pseudodeltidium, X 4, same specimen as preceding ; 

 (13, 14) impressions of the pedicle and brachial interiors, X 2, paratype, 117701a; 

 (15) plasticine replica of the brachial interior showing cardinalia, X 2, prepared 

 from the preceding mold. 



Benbolt formation (base), 0.2 mile south of the middle fork of Moccasin 

 Creek, i\ miles due south of Hansonville, Hansonville (T.V.A. 205-SW) Quad- 

 rangle, Va. 



B. Strophomena inspcciosa Willard 939 



(16, 18) Respectively Xi and X2 enlargements of the pedicle exterior, hypo- 

 type, 117729c; (17) exterior of another pedicle valve, X 2, hypotype, 117729a; 

 (19, 20) respectively X 1 and X 2 enlargements of the brachial exterior, hypo- 

 type, 117729c; (21) the pedicle interior showing muscle scars, X 2, hypotype, 

 H7729d; (22) brachial interior showing the cardinalia, X 2, hypotype, 117729b. 

 Carters formation (Oxoplecia bed), quarry 0.3 mile north of Gate City, Leeds 

 (15') Quadrangle, Ala. 



Plate 265 



furcitella, plonomena, strophomena 



A. Strophomena planumbona (Hall) 944 



(1, 2) Respectively X 1 and X2 views of the interior of a large brachial valve 

 showing the cardinalia and the forked septum, figured specimen, 1 17945. 

 Liberty formation, Dodges Creek, i| miles northwest of Oxford, Ohio. 



