﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER I I/O, 



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 specimen, X I, holotype, 117424c; (5) enlargement of the pseudodeltidium, 

 chilidium plates, and cardinal process, X 2, of the preceding; (6) pedicle view of 

 another specimen, X 1, paratype, 117424(1 ; (7, 8) respectively X 1 and X2 en- 

 largements of the interior showing pallial marks and muscle region, paratype, 

 117424b. 



Little Oak formation, intersection of Bailey Gap and main road, SW^SW^ 

 sec. 13, T. 19 S., R. 2 W., if miles northeast of Newhope Church, Cahaba 

 Valley, Vandiver (15') Quadrangle, Ala. 

 B. Titanambonitcs mcdius Cooper, new species 721 



(9) Brachial view of a complete specimen, X I, paratype, 117429b; (10) enlarge- 

 ment of the exterior surface, X 2, of the preceding specimen; (11) brachial view 

 of another full-grown specimen, X 1, paratype, 117429c; (14, 15) respectively 

 X 1 and X 2 enlargements of an impression of the pedicle interior prepared by 

 dissolving the shell away from the matrix to show the pallial and muscle marks, 

 paratype, 117429^ (16, 17) respectively Xi and X2 enlargements of the 

 brachial internal impression prepared by dissolving the shell from the matrix to 

 show the pallial marks and muscle scars, paratype, H7429g; (18) plasticine 

 replica of the brachial interior, X 2, prepared from the preceding impression, 

 showing the septa, pallial marks, and cardinalia; (21) posterior view of cardi- 

 nalia, X 2, paratype, 1 174296.. 



Athens formation (base), east side of the road 1.9 miles northeast of Chris- 

 tiansburg, Sweetwater (T.V.A. 131-SW) Quadrangle, Tenn. 



(12, 13) Brachial and side views of a nearly perfect specimen, X 1, holotype, 

 117426b; (19, 20) respectively X 1 and X2 enlargements of the brachial inte- 

 rior showing septa, pallial marks, and cardinalia, paratype, 117426a. 



Athens formation (base), Craighead Creek, | mile north of Christiansburg, 

 Sweetwater (T.V.A. 131-SW) Quadrangle, Tenn. 



Plate 179 

 sowerbyites, tltanambonites 



A. Titanambonitcs ampins (Raymond) 718 



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

 plete specimen, X I, hypotype, 11 7421; (6) brachial view of part of the preced- 

 ing specimen, X 2, showing beak region of both valves and ornamentation. 



"Lenoir" formation = Little Oak ?, east of Leeds, Leeds (15') Quadrangle, 

 Ala. 



B. Sowcrbyites delicatus Cooper, new species 725 



(7-1 1 ) Respectively brachial, posterior, pedicle, anterior, and side views, X 2, of 

 the holotype, H7399e; (12) brachial view, X I, of the holotype; (13) brachial 

 view of another complete specimen, X 2, paratype, H7399d; (14) pedicle inte- 

 rior, X 2, showing callosities at anterior end of diductor scars, paratype, 117399c; 

 (15) another pedicle interior, X 3, showing muscle area, anterior callosities, and 

 adductor pit, paratype, H7399g; (16) pedicle interior showing teeth, pseudo- 

 deltidium, and muscle area, X 3, paratype, 117399a; (17) brachial interior show- 

 ing median ridge, X 3, paratype, H7399h; (18) another brachial interior, X 4, 

 showing cardinalia, septa, and pallial markings exceptionally well developed, 

 paratype, H7399f ; (19, 20) another brachial interior and posterior view of same 

 showing cardinalia and pallial marks, X 4, paratype, 1 17399b. 



Sevier formation, 1.8 miles S. 18 E. of Athens, Athens (T.V.A. 125-NE) 

 Quadrangle, Tenn. 



