﻿I238 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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 (2) pedicle interior, X 1, showing muscle area and thick ridge surrounding it, 

 hypotype, 117704b. 



Auburn chert, \ mile east of Auburn, Elsberry (15') Quadrangle, Mo. 



B. Strophomena auburnensis nasuta Cooper, new subspecies 929 



(3-6) Respectively posterior, pedicle, brachial, and side views of a complete speci- 

 men, X I, holotype, 45507a; (7) enlargement of the ornamentation of the pre- 

 ceding specimen, X 4, left side of brachial valve; (9) pedicle interior, showing 

 thick rim around muscle area, X 1, paratype, 45507b; (10) another pedicle 

 interior, X i, paratype, 87091. 



Tyrone formation, High Bridge, Harrodsburg (30') Quadrangle, Ky. 



(8, 11) Exterior and interior of a pedicle valve, X h hypotype, 117703a; (12) 

 region of the muscle area, X 2, of the preceding specimen. 



Carters formation, F. B. Cooper Farm, 2 miles southeast of Pikeville, Pike- 

 ville Special (15') Quadrangle, Term. 



C. Strophomena, sp. 1 947 



(13, 14) Exterior and interior of a brachial valve, X 1, figured specimen, 117742a; 

 (15) interior of the preceding brachial valve, X 2, showing cardinalia. 



Just beneath the hard sandstone of the Eureka quartzite, west side of the 

 Antelope Range about 3 miles south of Ninemile Canyon, Roberts Mountains 

 (i°) Quadrangle, Nev. 



Plate 258 

 Strophomena 



A. Strophomena basilica Cooper, new species 930 



(2, 3) Side and brachial views of a small but complete specimen, X I, paratype, 

 i T 77°5g; (4» 5) brachial and pedicle views of a large complete specimen, X l, 

 holotype, 117705a; (1, 6) pedicle interior showing form of muscle area, X i ( 

 paratype, 117705c; (7) another pedicle interior, X I, paratype, 117705c; (8, 9) 

 respectively X 1 and X 2 enlargements of a large pedicle interior showing 

 muscle scars and pseudodeltidium, paratype, 117705b; (10, 11) exterior and 

 interior views of a large brachial valve, X 1, paratype, 117705b; (12) cardinalia, 

 X 2, of the preceding specimen; (13) posterior of the preceding specimen, X 2, 

 showing lateral profile and cardinal process; (15, 16) interior and exterior of 

 another brachial valve, X 1, paratype, H7705d; (17) exterior of the preceding, 

 X 2, showing ornamentation; (14) cardinalia, X 2, of the preceding specimen. 

 Ridley formation (lower third), east side of Marshall Knobs, 5 miles south of 

 Murfreesboro, Murfreesboro (15') Quadrangle, Tenn. 



Plate 259 

 Strophomena 



A. Strophomena medialis Butts 940 



(1, 2) Pedicle and brachial views of a large specimen, X I, lectotype, 98201a; 

 (4-8) respectively posterior, anterior, brachial, pedicle, and side views, X l, 

 of the hypotype, 117730a; (9) posterior half of the preceding, X 2, showing 

 interareas and carinate pseudodeltidium; (10) ornamentation of the same speci- 

 men, X 4, part of pedicle valve; (13) pedicle interior showing the muscle area, 

 X I, hypotype, 117730b. 



Wardell formation, Lloyd Carter's barn, 0.8 mile by road northeast of school 

 at Rye Cove, Clinchport (T.V.A. 188-NW) Quadrangle, Va. 

 (11) Interior of the pedicle valve, X 1, showing the muscle scars and pseudo- 



