﻿Il80 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



Plate 180 

 sowerbyites, tltanambonites 



Page 



A. Sowerbyites triseptatus (Willard) 730 



(i-3> 5) Respectively posterior, pedicle, anterior, and side views, X I, of the hypo- 

 type, 117409a; (4, 8) respectively X 1 and X 2 views of another complete speci- 

 men, hypotype, 117409b; (9) enlargement, X 3, of the exterior surface of the 

 preceding; (6) pedicle view of the same hypotype, X 2, showing thin, crowded 

 lamellae; (7) brachial view of another complete specimen, X 2, stripped of the 

 lamellae, hypotype, 117409c; (11) brachial interior, showing cardinalia and 

 septum, X 2, hypotype, 11 7409c 



Lincolnshire formation (Hogskin member), Sally Cleveland Farm, | mile 

 southwest of Washburn, Dutch Valley (T.V.A. 154-SE) Quadrangle, Tenn. 

 (10) Pedicle interior showing the muscle area with the thick callosities at the 

 anterior end of the diductor scars, X 2, hypotype, 117411b. 



Lincolnshire formation (Hogskin member), Clinchport, Clinchport (T.V.A. 

 188-NW) Quadrangle, Va. 



(12) Specimen from which part of the pedicle valve has been removed to show 

 the brachial ridges, X 2, hypotype, 117410a. 



Lincolnshire formation (Hogskin member), 0.4 mile east-northeast of Red 

 Hill, 4i miles west-southwest of Thorn Hill, Avondale (T.V.A. 162-SW) Quad- 

 rangle, Tenn. 



(13) Another brachial interior showing the strong median ridge and the faint 

 lateral ones, X 2, hypotype, 117412b. 



Lincolnshire formation (Hogskin member), on the south side of the first 

 bridge on U. S. Highway 25E north of Thorn Hill, Avondale (T.V.A. 

 162-SW) Quadrangle, Tenn. 



B. Titanambonites amplus (Raymond) 718 



(14, 15) Brachial and pedicle views of an imperfect specimen, X I, hypotype, 

 117420a; (16) pedicle view of the preceding, X ii, showing the median ridge 

 exposed through a hole in the pedicle valve. 



Little Oak formation, point of ridge, 1 mile southwest of Newhope Church, 

 Vandiver (15') Quadrangle, Ala. 



C. Sowerbyites lamellosus Cooper, new species 728 



(17, 18) Pedicle and brachial views, X 1, of the holotype, 117406c; (19) brachial 

 view of the holotype, X 2, showing the external lamellae; (20, 21) respectively 

 X 1 and X 2 enlargements of the pedicle interior, showing adductor pit, long 

 diductor scars, and pallial marks, paratype, 117402c; (23) another pedicle inte- 

 rior showing the callosities at the anterior ends of the diductor scars, X 2, 

 paratype, 117402b; (22) another pedicle interior, X 2, showing the muscle 

 scars well, paratype, 117402I1; (24, 25) respectively X 1 and X 2 of the brachial 

 interior showing the median septum and cardinalia, paratype, 117402a. 



Bromide formation (Mountain Lake member — 160 feet above the base), i mile 

 west of U. S. Highway 77, NEi sec. 25, T. 2 S., R. 1 E., Carter County, Okla. 



Plate 181 

 Sowerbyites, Titanambonites 



A. Titanambonites crassus (Willard) 720 



(1, 2, 6) Pedicle, brachial, and side views of a complete specimen, X I, hypotype, 

 117425a; (3-5) brachial, side, and pedicle views of a large specimen, X 1, hypo- 

 type, 117425b; (8) impression of the pedicle interior, X I, prepared by burning 

 shell from matrix, hypotype, 117425c; (7, 9) respectively X 1 and X i£ enlarge- 



