﻿1054 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



Plate 32 

 Cyrtonotella, Hesperorthis, Pleurorthis, Rhysostrophia 



Page 



A. Pleurorthis sp. 1 332 



(1) Brachial valve, X 2, figured specimen, 1 16846. 



Table Head series, south side of Stearing Island, Cow Head, Newfoundland. 



B. Pleurorthis imbecilis (Billings) 331 



(2, 4) Two pedicle valves, fig. 4 showing the dental plate impressions, X 2, hypo- 

 types, 116842b and 116842a. 



Upper Table Head series, Table Point Cove, Newfoundland. 

 (3) Brachial exterior, X 2, hypotype, 1 16843. 



Upper Table Head series, Table Point, Newfoundland. 



C. Pleurorthis sp. 2 333 



(5, 6) Exterior and interior of a silicified pedicle valve, X 2, figured specimen, 

 1 1 6848. 

 Lower middle Table Head series, north of Table Head, Newfoundland. 



D. Rhysostrophia sp. 1 560 



(7, 8) Interior and exterior of a pedicle valve, X 4, figured specimen, 17228. 



Pogonip group (Desmorthis zone), west side of Goodwin Canyon, Eureka 

 District, Nev. 



E. Hesperorthis ? costalis (Hall) 349 



(9, 13) Impression of pedicle interiors showing short dental plates and muscle 

 scars, X 2, hypotypes, 116853d, 116853c; (10, 11) respectively impression of the 

 brachial interior and a replica of the interior prepared from the impression, X 2, 

 hypotype, 116853J; (12) somewhat exfoliated pedicle exterior, X 2, hypotype, 

 116853b; (14) another pedicle valve, X 2, hypotype, 116853c. 



Day Point formation (upper "Orthis" bed), quarry just north of Hotel Cham- 

 plain, south of Cliff Haven, Plattsburg (15') Quadrangle, N. Y. 

 (15) An imperfect pedicle valve, X 2, Hall's type specimen, A.M.N.H. 528. 

 Chazy group, Chazy, N. Y. 



F. Cyrtonotella f sp. 1 326 



(16, 17) Respectively the plasticine replica of the brachial valve, X 2, and the 

 impression from which it was prepared, X 2, figured specimen, 109867b; (18) 

 plasticine replica of the brachial exterior, X 2, figured specimen, 109867a; (19) 

 plasticine replica prepared from the internal impression of a somewhat larger 

 brachial valve than that figured above, X 2, figured specimen, I09867d; (20) 

 brachial exterior, X 2, counterpart to internal impression shown in fig. 17, fig- 

 ured specimen, 109867c; (21) plasticine replica of the pedicle exterior, X 2, 

 figured specimen, 109867a. This specimen is the counterpart of the brachial 

 exterior shown in fig. 18. 



Botetourt formation, Hayes Creek, 2 miles northwest of Brownsburg, Lexing- 

 ton (15') Quadrangle, Va. 



Plate 33 

 Orthambonites 



A. Orthambonites divaricatus Cooper, new species 302 



(1, 2) Interior and exterior of the pedicle valve, X I» holotype, 109838a; (3) bra- 

 chial interior, X 2, paratype, 109838b. 



Effna-Rich Valley formations, Porterfield Quarry, 5 miles east of Saltville, 

 Maccrady (T.V.A. 218-NW) Quadrangle, Va. 



B. Orthambonites multicostellatus Cooper, new species 307 



(4, 5) Interior and exterior of the brachial valve. X I. paratype, 116875a. 



