BIBLIOGRAPHY OF R. P. WHITFIELD 27 



Descriptions of new fossils. Pp. 103-104, with 1 pi. in William Ludlow's "Re- 

 port of a reconnaissance of the Black Hills of Dakota made in the summer 

 of 1874." 4to, Washington, D. C, 1875. 



Remarks on changes undergone by one of our fresh-water mollusks, showing 

 a tendency to specific variation. Proceedings of the Albany Institute, vol. 

 ii, 1875, pp. 199-201. 



Description of new species of fossils. Pp. 141-145, pis. 1, 2, in William Lud- 

 low's "Report of a reconnaissance from Carroll, Montana Territory, on 

 the upper Missouri, to the Yellowstone National Park, and return." Made 

 in the summer of 1875. 4to, Washington, D. C, 1876. 



Preliminary report on the paleontology of the Black Hills. 49 pp. Washing- 

 ton, 8vo, 1877. 



With James Hall : Paleontology. Pp. 197-302, pi. 7, in Clarence King's "U. S. 

 geological exploration of the fortieth parallel." Vol. iv, 4to, Washington, 

 D. C, 1877. 



Remarks on some lamellibranchiate shells of the Hudson River group, with 

 description of four new species. Journal of the Cincinnati Society of 

 Natural History, vol. i, 1878, pp. 137-141, pi. 6, figs. 5-8a. 



Discovery of specimens of Maclurea magna, of the Chazy, in the Barnegat 

 limestone, near Newburg, New York. American Journal of Science, 3 ser., 

 vol. xviii, 1879, p. 227. 



Paleontology of the Black Hills of Dakota. Pp. 325-468, pis. 1-16, in Henry 

 Newton and Walter B. Jenney's "Report on the geology and resources of 

 the Black Hills of Dakota." 4to, Washington, D. C, 1880. 



Notice of new forms of fossil crustaceans from the Upper Devonian rocks of 

 Ohio, with descriptions of new genera and species. American Journal of 

 Science, 3 ser., vol. xix, 1880, pp. 33-42. 



Notice of the occurrence of rocks representing the Marcellus shale of New 

 York, in central Ohio. Proceedings of the American Association for the 

 Advancement of Science, twenty-eighth meeting (1879), 1880, pp. 297-299. 



On the occurrence of true Lingula in the Trenton limestone. American Jour- 

 nal of Science, 3 ser., vol. xix, 1880, pp. 472-475, 2 text figs. 



Description of a new species of Crinoid from the Burlington limestone, at Bur- 

 lington, Iowa. Bulletin of the American Museum of Natural History, vol. 

 i, 1881, pp. 7-9, pis. 1, 2. 



Remarks on Dictyophyton, and descriptions of new species of allied forms 

 from the Keokuk beds at Crawfordsville, Ind. Ibid., vol. i, 1881, pp. 10-20, 

 pis. 3,4. 



Observations on the purposes of the embryonic sheaths of Endoceras and their 

 bearing on the origin of the siphon in the Orthocerata. Ibid., vol. i, 1881, 

 pp. 20-28, 4 figs. 



Notice of a new genus and species of air-breathing mollusk [Anthracopupa 

 ohioensis] from the Coal-measures of Ohio, and observations on Dawson- 

 ella. American Journal of Science, 3 ser., vol. xxi, 1881, pp. 125-128, 

 text figs. 



Observations on the structure '>f Dictyophyton and its affinities with certain 

 sponges. Ibid., 3 ser., vol. xxii, 1881, pp. 53-54. 



On the nature of Uictyophyton. Ibid., 3 ser., vol. xxii, 1881, p. 132. 



