﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOI>ER 1145 



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 rior, and in full view to show the large cardinal process, X 3, hypotype, 117210a. 

 Decorah formation (Ion member), cut on county road 1.1 miles east of U. S. 

 Highway 52, south side of Cannon Falls, Goodhue County, Minn. 



Plate 139 

 rostricellula 



A. Rostricellula minnesotensis (Sardeson) 639 



(1-5) Respectively anterior, posterior, side, brachial, and pedicle views of a small 

 specimen, X 1, hypotype, 117219b; (6) brachial view, X 2, of the preceding; 

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

 large and nearly perfect individual, X I, hypotype, 117219a. 



Platteville formation (McGregor member), from a quarry on Wisconsin 

 Highway 81, 1 mile northwest of Ellenboro, Lancaster (30') Quadrangle, Wis. 



B. Rostricellula rotundata Cooper, new species 649 



(12-16) Respectively anterior, posterior, side, brachial, and pedicle views of a com- 

 plete and perfect specimen, X I, the holotype, 36550a; (17) brachial view of 

 another complete specimen, X 2, paratype, 36550b; (18-22) respectively poste- 

 rior, anterior, side, pedicle, and brachial views, X i, of the previous paratype. 

 Swift Current formation, St. Joseph Island in St. Marys River, Ontario, 

 Canada. 



C. Rostricellula varicosta Cooper, new species 654 



(23-27) Respectively brachial, anterior, pedicle, posterior, and side views of a com- 

 plete specimen, X 1, holotype, 117238a; (28-30) respectively pedicle, side, and 

 brachial views, X 2, of the same specimen; (31-34) respectively side, anterior, 

 pedicle, and brachial views of another complete but narrower specimen, X 1, 

 paratype, 117238b; (35, 36) brachial and pedicle views, X 2, of the same 

 specimen. 



Lenoir formation (Douglas Lake member), 0.65 mile southwest of Williamson 

 Chapel, Tallassee (T.V.A. 139-SE) Quadrangle, Tenn. 



D. Rostricellula multicostata Cooper, new species 641 



(37-4 1 ) Respectively posterior, pedicle, side, anterior, and brachial views of a 

 large and perfect specimen, X', holotype, 117221a; (42-44) respectively bra- 

 chial, side, and pedicle views, X 2, of the same specimen; (45-49) respectively 

 posterior, brachial, pedicle, side, and anterior views of another complete speci- 

 men, X 1, paratype, 117221c; (50) brachial view, X 2, of the same; (51, 52) 

 pedicle and brachial views of a partially exfoliated specimen, X I, paratype, 

 117221c; (53) anterior slope of the preceding, X 3, showing the smooth, rounded 

 costae. 



Ellett formation (10 feet above the Knox dolomite), I mile south of Ellett, 

 Blacksburg (15') Quadrangle, Va. 



E. Rostricellula sp. 3 657 



(54) Brachial view of the exterior, X 4, showing the microornamentation of the 

 surface, figured specimen, 1 17237. 



Prosser formation (lower), road cut 1.2 miles east of U. S. Highway 52, south 

 side of Cannon Falls, Goodhue County, Minn. 



Plate 140 

 Idiospira, Protozyga 



A. Protozyga magnicostata Cooper, new species 680 



(1-4) Respectively brachial, side, pedicle, and anterior views of a complete sped- 



