﻿Il88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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 108133c; (33) imperfect pedicle interior showing the small muscle area and 

 small pseudodeltidium, X 3, hypotype, 117440a; (34) brachial interior, X 2, 

 showing small disk, hypotype, 108133c; (35) another brachial interior showing 

 the delicate cardinalia, X 2, hypotype, 108133a; (36) brachial interior of a very 

 young specimen, X 4, showing cardinalia and an interior with an incipient disk, 

 hypotype, 117440c; (37) excellent brachial interior showing the well-formed disk 

 and cardinalia, X 3, hypotype, 117440b. 



Pogonip group (topmost beds), Ikes Canyon about 1 mile above the mouth, 

 east side Toquima Range, Roberts Mountains (i°) Quadrangle, Nev. 



Plate 190 

 Leptellina 



A. Leptellina bella Cooper, new species 748 



(1, 2) Pedicle and brachial views of a complete specimen, X t, holotype, 117434c; 

 (3) brachial view, X 2, of the preceding; (4) brachial interior, X 3, showing 

 disk and cardinalia, paratype, 117434b. 



Chatham Hill formation, Grayson Farm, 4 miles southwest of Bland, Bland 

 County, Va. 



B. Leptellina sublamellosa Cooper, new species 755 



(5) Exterior of the pedicle valve, X 1, paratype, 117450a; (6-8) pedicle, side, 

 and anterior views, X 2, of the preceding specimen. 



Edinburg formation (Cyrtonotella zone), ravine on south side of railroad 

 tracks, £ mile east of Strasburg Junction, Strasburg (15') Quadrangle, Va. 



C. Leptellina sublamellosa Cooper, new species 755 



(9) Brachial view of a complete specimen preserving some external lamellae, X 1, 

 paratype, 117447b; (17, 18) pedicle and brachial views, X 2, of the same speci- 

 men; (10-12) posterior, anterior, and brachial views of a complete specimen, 

 X i) holotype, H7447g; (13-16) respectively brachial, side, anterior, and poste- 

 rior views, X 2, of the preceding specimen; (19, 20) interior and posterior views 

 of the brachial valve showing cardinalia, disk, and median ridge, X 3, paratype, 

 H7447e; (23) same as preceding, X2; (21, 22) anterior and side views of an- 

 other brachial interior showing elevated disk and pallial marks on the surface 

 anterior to it, X 3, paratype, 117447^ (24) normal interior view, X 2, of the 

 preceding; (25) interior of the pedicle valve tilted to show muscle area, X 2, 

 paratype, 117447b. 



Chatham Hill formation, 1.2 miles S. 31° E. of Sharon Springs, Burkes 

 Garden (15') Quadrangle, Va. 



D. Leptellina tennesseensis Ulrich and Cooper 756 



(26-29) Respectively brachial, anterior, side, and pedicle views of a nearly com- 

 plete specimen, X 2, showing lamellae, hypotype, 117455a; (30) pedicle view of 

 another, imperfect specimen, X 2, not preserving the exterior lamellae, hypotype, 

 117455b; (31) posterior view of the preceding, X 3, showing pseudodeltidium, 

 cardinal process, and chilidial plates. 



Arline formation, on Sevierville Pike, 3 miles southeast of Knoxville, Term. 



E. Leptellina subcarinata Cooper, new species 754 



(32) Plasticine replica of the brachial exterior of a complete specimen, X 2, pre- 

 pared from mold, paratype, H7446g; (33) plasticine replica of the pedicle exte- 

 rior, X 2, prepared from mold, holotype, 117446a; (34) impression of the pedicle 

 interior showing small muscle area, X 2, paratype, 117446b; (35) another pedicle 

 interior impression showing muscle area and pseudopunctate anterior, X 2, para- 

 type, H7446f; (36) plasticine replica of the pedicle interior prepared from the 

 preceding impression, X 2, and showing small ridge anterior to muscle area ; 



