WRITINGS OF R. P. WHITFIELD. 261 



Page. 

 Zellinida. 



Leiopistha, Meek 35 



Subgenus Cymella, Meek 35 



Leiopistha ( Cymella) meeki, n. s. , "WTiitfleld, 1877, pL xi, flgs. 27, 28 35-36 



AnatinidcB. 



Ihracia, Leach 36 



r. «Mbpiraciii«, 11.8., Whitfleld, 1877, pLxi,fig8. 29-30 36 



Oaateropoda. 



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



Aporrhals meehi, n. a. , "Whitfield, 1877, pi. xii, fig. 5 37 



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



Akera, O. F. MuUer 38 



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



Cephalopoda. 



Helicoceras, D'Orb 39 



H. stevensoni, n. s., Whitfield, 1877, pi. xiv, figs. 4-7 39-40 



Heteroceras, D'Orb 40 



Blfnewtoni, n.s., Whitfield, 1877, pi. xv,fig8. 1-4 40-41 



Ancyloceras, D'Orb 42 



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



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



Ptychoeeras meekanum, n. a., Whitfield, 1877, pi. xvi, figs. 1-2 44-45 



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



List of fossils described in the report of the Paleontology of the Black Hills 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, by 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 PROM THE PRIMORDIAL ROCKS. 



Plantce. Page. 



Palceochorda 331 



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



PaloBophycus, Hall 332 



P. occidmtoiig, Whitfield, 1877, pi. i, fig. 3 332 



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



Tncertcesedes. 



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



Brachiopoda. 

 Lingulida>. 



Lingiilepis, Hall 335 



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



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



L. perattenuatug, ^¥hit&eld, ]877,pl. ii, figs. 7-9 337 



L.dakotenifis, M. &. H., pi. ii, flgs. 10-11 337-338 



Obolidce. 



Obolus, Eichwald 



0.? pectenoides,'Whit&e\d, 1875, pi. ii, flgs. 18-19 338-339 



Obolella, Billings 339 



O. poiiia, Hall, 1860, pi. ii, figs. 12, 13 339-340 



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



Articulata. 



Trildbita. 

 Oalymenidce. 



Orepicephalus, Owen (? Loganellus, Devine) 341 



O. centralis, Whitfield, 1877, pi. ii, flgs. 21-24 341-343 



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



FOSSILS FROM THE JURASSIC BOCKS. 



Radiata. 

 Echinodermata. 

 Asteroidea. 



Asterius, Linn 344 



Jl .? dubiiun, Whitfield, 1877, pi. iii, fig. 3 344-345 



