WRITINGS OF R. P. WHITFIELD. 261 



Page. 

 2!eUinidoe. 



Leiopistha, Meek 35 



Subgenus Cymella, Meek 35 



Leiopistha ( Cymella) meelfi, n. s. , Whitfield, 1877, pi. xi, flgs. 27, 28 35-36 



AnatinidcB. 



Ihracia, Leach 36 



T. subgracilis, n. s., Whitfield, 1877, pL xl, figs. 29-30 36 



Oasteropoda. 



Fusus cheyennensis, n. s., Whitfield, 1877, pi. xii, fig. 9 '37 



Aporrhais meeki, n. s., Whitfield, 1877, pi. xii, fig. 5 37 



Aporrhais ( Ooniocheila) castorensis, n. s., Whitfield, 1877, pi. xii, fig. 1 38 



Akera, O. F. Mnller 38 



A. glans-oryza, n.a., Whitfield, 1877, pi. xii, fig. 25 38-39 



Cephalopoda. 



Hdicoceras, D'Orb 39 



if. «t«r)en«oni, n. 8., Whitfield, 1877, pi. xiv, figs. 4-7 39-40 



Heterocerag, D'Orb 40 



S.newtoni, n. s., Whitfield, 1877, pL xv, figs. 1-4 40-41 



Ancyloceras, D'Orb 42 



A.jenneyi, n. s., Whitfield, 1877, pi. xvi, figs. 6-8 42-43 



A. tricostatus, n. s., Whitfield, 1877, pi. xv, flgs. 7-8 43-44 



Ptychoceras meekaniim, n. s., Whitfield, 1877, pi. xvi, figs. 1-2 44-45 



Ptychoceras crassum, n. s., Whitfield, 1877, pi. xvi, figs. 3-5 45-46 



List of fossils described in the report of the Paleontology of the Black HUls 46-49 



4. 



Whitfield, R. P. Paleontology of the Black Hills of Dakota. <; Report on the Ge- 

 ology and Resources of the Black Hills of Dakota, hy Henry Newton, E. M., and 

 Walter P. Jenney, E. M. <CU. S. Geographical and Geological Survey of the 

 Rocky Mountain region, J. W. Powell in charge, pp. 325-468, pis. i-xvi. Wash- 

 ington, 1880. 



FOSSILS FROM THE PRIMORDIAL ROCKS. 



PlantcB. ' Page. 



Palceochorda ..- 331 



P. prima, Whitfield, 1877, pi. i, fig. 2 331-332 



Palceophycug, Hall 332 



P. occxd«n<aii«, Whitfield, 1877, pi. i, fig. 3 332 



Palceophycus, sp.? Whitfield, 1880, pi. i, fig. 1 333 



Incertcesedes. 



Arenicolites, sp.? Whitfield, 1880, pi. ii, fig. 25 333-334 



Brachiopoda. 

 lAngulidcp. 



Lingtilepis, Hall 335 



L. pinnaformis, Owen, pi. ii, figs. 1-4 335 



i. cuneolus, Whitfield, 1877, pi. ii, figs. 5-6 336 



i.pera«€nwa«us, Whitfield, 1877, pi. ii, figs. 7-9 337 



L. dakotemis, M. & H., pi. ii, figs. 10-11 337-338 



Obolidce. 



Obolus, Eich wald 



O.? pectenoides, Whitfield, 1875, pi. ii, figs. 18-19 338-339 



Obolella, Billings 339 



O. poJita, Hall, 1860, pi. ii, flgs. 12, 13 339-340 



O. nana, M. & H., 1861, pi. ii, figs. 14-17 340-341 



Articulata. 



Trilobita. 

 Oalymenidce. 



Crepicephalus, Owen (? Loganellus, Devine) 341 



G. centralis, Whitfleld, 1877, pi. ii, figs. 21-24 341-343 



O. planus, Whitfield, 1877, pi. ii, fig. 20 343-344 



FOSSILS FROM THE JURASSIC BOCKS. 



Radiata. 

 Echinodermata. 

 Asleroidea. 



Asierias, Linn 344 



A.% liuWitm, Whitfield, 1877, pi. iii, fig. 3 344-345 



