﻿1210 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



Page 

 Oranda formation, 200 yards on Virginia County Highway 616, southeast of 

 U. S. Highway 11, 3.5 miles southwest of Mount Jackson, Mount Jackson (15') 

 Quadrangle, Va. 

 G. Christiania platys Cooper, new species 804 



(29) Brachial interior of a silicified specimen, X 2, paratype, 117573. 

 Edinburg formation (lower), ii miles south of Wadesville, Winchester (15') 



Quadrangle, Va. 

 H. Chonetoidea virginica Cooper, new species 861 



(30) Plasticine replica of the pedicle exterior, X 4. paratype, 111097a; (31) im- 

 pression of the pedicle interior showing the small muscle marks, X 5, paratype, 

 111097b; (32) plasticine replica of the pedicle interior and exterior, X 4, pre- 

 pared from the preceding mold; (33) impression of the brachial and pedicle 

 interior, X 5, holotype, 1 1 1097c. 



Edinburg formation (Liberty Hall facies), bluff on the north fork of the 

 Shenandoah River, \ mile above the south fork, opposite the bridge at Riverton, 

 Front Royal (15') Quadrangle, Va. 



Plate 216 

 Dactylogonia 



A. Dactylogonia sp. 8 840 



(1-3) Brachial, side, and pedicle views of a complete specimen, X 2, figured speci- 

 men, 117613a; (4) brachial view, X 1, of the same specimen. 



Poteet formation (Yellow Branch member), road along Yellow Branch, 

 5 miles southeast of Rose Hill, Rose Hill (T.V.A. 161-NE) Quadrangle, Va. 



B. Dactylogonia concentrica Cooper, new species 826 



(5) Brachial view of a complete specimen, X I, holotype, 1 17583; (6, 7) brachial 

 and pedicle views, X 2, of the holotype. 



Lincolnshire formation (Hogskin member), 1.7 miles northeast of Hall Cross- 

 road, Fountain City (T.V.A. 146-SW) Quadrangle, Tenn. 



C. Dactylogonia obtusa Cooper, new species 832 



(8) Pedicle view of a complete specimen, X I, holotype, 117594}; (JO, 11) side 

 and brachial views of another specimen, X 1, paratype, H7594d; (9) interior 

 of the brachial valve showing the plates arising from the valve floor, X 2, para- 

 type, H7594h; (13) the same, X2 , tilted to the side to show the floor plates; 

 (12) fragment of the pedicle interior showing the muscle scars, X 2, paratype, 

 117594c. 



Lincolnshire formation, Clinch Valley at Shiloh Church, near the center of the 

 northwest subquad., Pressmens Home (T.V.A. 171-NE) Quadrangle, Tenn. 



D. Dactylogonia geniculata Ulrich and Cooper 827 



(14, 26) Pedicle and brachial views, X 2, of the holotype, 108202a; (20, 24, 28-30) 

 respectively brachial, pedicle, side, posterior, and anterior views, X 1, of the holo- 

 type; (15) brachial interior showing the floor plates, X 2, paratype, io8202g; 

 (16) specimen seen from the side of the pedicle valve with a window cut in the 

 pedicle valve to show the floor plates, X 2 , hypotype, 117585^ (21) imperfect 

 brachial interior showing floor plates, X 2, paratype, io8202d; (17) interior of 

 another brachial valve showing cardinalia, floor plates, peripheral rim, and pallial 

 marks, X 2, hypotype, 117585I1 (missing) ; (18) pedicle interior showing muscle 

 area, X i> paratype, 108202b; (22) same specimen, X 2, tilted to show median 

 ridge; (19) another pedicle interior showing a thickened muscle area, X 2, hypo- 

 type, 117585b; (23) posterior of a complete specimen, X 2, showing apical fora- 

 men and pseudodeltidium, paratype, io8202f ; (25) pedicle interior, X 2, showing 

 form of muscle scars and faint median ridge, hypotype, 117585c; (27) poste- 



