﻿1 184 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I2J 



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 terior of brachial valve of holotype, X 3, showing cardinal process and ends of 

 brachiophores. 



Upper Pogonip group (upper 30 feet), 1 mile above mouth of Ikes Canyon, 

 Toquima Range, Roberts Mountains (l°) Quadrangle, Nev. 



B. Titanambonitcs medins Cooper, new species 7 21 



(11, 12) Anterior and exterior views of a large pedicle valve, X i, paratype, 

 117429a; (13) interior of a slightly laterally compressed pedicle valve showing 

 elongate diductors and their anterior thickenings, X I, paratype, 117429c 



Athens formation (base), 1.9 miles northeast of Christiansburg, Sweetwater 

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



C. Syndielasma biseptatum Cooper, new species 743 



(14-18) Respectively brachial, pedicle, anterior, posterior, and side views, X 2, of 

 the holotype, H756Sg; (19, 20) pedicle and brachial views, X 2, of a paratype, 

 117565a; (21, 22) pedicle and brachial views of another paratype, X 2, showing 

 deep brachial sulcus, 1175656; (23) pedicle view of a well-preserved specimen 

 showing costellae, X 2, paratype, 117565c; (24) brachial view, X 1, of the pre- 

 ceding; (25) brachial interior, X 3, showing notothyrial callosity and long, slen- 

 der diverging plates extending anteriorly from it, paratype, 117565^ (26) the 

 brachial plates seen through a "window" in the pedicle valve, X 3. paratype, 

 117565b; (27) brachial interior of a very young specimen, X 5, paratype, 

 U7565d; (28, 29) interior and posterior views of the brachial valve, X 5» show- 

 ing notothyrial callosity, long, slender brachiophores, and cardinal process, 

 paratype, 117565b. 



Horizon and locality same as A above. 



Plate 186 



Ancistrorhyncha, Dactylogonia, Eremotoechia, Leptellina, Ptychoglyptus, 

 Reuschella, Zygospira 



A. Leptellina bella Cooper, new species 74§ 



(1, 6) Pedicle view, X 1, of a paratype, 117435b; (4) side and exterior views, 

 X 2, of the preceding; (2, 3, 5) posterior, pedicle, and anterior views, X 2, of 

 another paratype, 117435c; (7) pedicle view, X 3, of the same; (8) impression 

 of the pedicle interior showing the muscle area, X 2, paratype, 117435! 



Whitesburg formation, old road to Morristown, i£ miles west of Bulls Gap, 

 Bulls Gap (T.V.A. 171-SE) Quadrangle, Tenn. 



B. Zygospira sp. 1 674 



(9) Exterior of the pedicle valve, X 2, figured specimen, 117262a; (10) exterior 

 of the brachial valve showing broad sulcus, X 2, figured specimen, 117262b. 



Sevier formation, slope on west side of the church in Guthrie Gap, Bulls Gap 

 (T.V.A. 171-SE) Quadrangle, Tenn. 



C. Reuschella vespertina Cooper, new species 979 



(11) Exterior of a poorly preserved brachial valve showing deep sulcus, X Ij 

 paratype, 123255b; (12) exterior of the pedicle valve showing median carina, 

 X 1, paratype, 123255c. 



Dark shale under Eureka quartzite, in north-facing nose of hill 8167, Martins 

 Ridge, Monitor Range, Roberts Mountains (i°) Quadrangle, Nev. 



D. Leptellina platys Cooper, new species 751 



( 13, 14) Pedicle and brachial exteriors of a nearly complete specimen, X 2, 

 holotype, 1 17439. 



Benbolt formation (base), i mile east of Speers Ferry, Clinchport (T.V.A. 

 188-N W) Quadrangle, Va. 



