﻿I070 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 12J 



Page 

 St. Martin formation, Belanger, 2 miles south of Cap St. Martin, Quebec, 

 Canada. 



G. Atelelasma platys Cooper, new species 5 2 3 



(29, 30) Two views of the pedicle interior, X 2, tipped to show spondylium, holo- 

 type, 110144; (31) brachial interior, X 2, of the holotype; (32, 33) brachial and 

 pedicle views, X 2, of the holotype ; (34) same, X I- 



Lincolnshire formation (Hogskin member), on the Maynardville Pike, 1.7 

 miles northeast of Hall Crossroad, Fountain City (T.V.A. 146- SW) Quad- 

 rangle, Term. 



H. Desmorthis nevadcnsis Ulrich and Cooper 447 



(35-39) Respectively anterior, pedicle, posterior, brachial, and side views of a com- 

 plete but somewhat exfoliated specimen, X 2, hypotype, 110817a. 



Joins formation (about 20 feet above the base), \ mile west of U. S. High- 

 way 77, sec. 25, T. 2 S., R. 1 E., Carter County, Okla. 



I. Ptychopleurella sulcata Cooper, new species 390 



(40) Pedicle exterior, X 2, paratype, 110108b; (41) brachial exterior, X 2, 

 holotype, 110108a. 



Oranda formation, £ mile west of Strasburg, Strasburg (15') Quadrangle, 

 Va. 



J. Desmorthis costata Cooper, new species 446 



(42-46) Respectively anterior, posterior, side, brachial, and pedicle views of a com- 

 plete specimen, X 2, holotype, 110813a. 



Joins formation, S Wj sec. 2, T. 1 S., R. 1 W., about 4 miles east of Hennepin, 

 Murray County, Okla. 



K. Hesperorthis quadrata Cooper, new species 355 



(47-49) Respectively brachial, pedicle, and side views, X 1, holotype, 116921; 

 (50-54) respectively pedicle, anterior, posterior, side, and brachial views, X 2, 

 of the same. 



Lebanon formation, cut on U. S. Highway 241, 2.1 miles north of Bedford 

 County line, in Rutherford County, Term. 



Plate 51 

 Hesperorthis 



A. Hesperorthis biconvexa Cooper, new species 346 



(1) Pedicle interior, showing small muscle area, X 1, holotype, 109962; (2-4) 

 pedicle, brachial, and side views, X 1, of the holotype; (5) brachial interior, 

 X I, of the holotype; (6) interior of an imperfect pedicle valve showing muscle 

 scars, X 3, paratype, 109964. 



Lincolnshire formation, \ mile north of Eidson, along an old lane, Kyles Ford 

 (T.V.A. 170-SE) Quadrangle, Tenn. 



B. Hesperorthis dubia Cooper, new species 351 



(7-10) Respectively pedicle, brachial, side, and posterior views of a nearly perfect 

 specimen, X 1, holotype, 116919; (11-13) respectively posterior, brachial, and 

 anterior views, X 2, of the same specimen. 



Lower Sevier formation, \ mile northeast of Miser, Louisville (T.V.A. 

 138-SE) Quadrangle, Tenn. 



C. Hesperorthis multicostata Cooper, new species 354 



(14) Brachial view, X 2, of the holotype, 109986; (15-18) respectively side, 

 pedicle, brachial, and anterior views, X I, of the holotype. 



Lincolnshire formation (cherty bed at base of "Ottosee"), Evans Ferry, 

 U. S. Highway 25E, about 1 mile north of Indian Creek, Howard Quarter 

 (T.V.A. 162-N W) Quadrangle, Tenn. 



