1879.] NATURAL SCIENCES OF PHILADELPHIA. 337 



1869. Pot. (Scaphiocr.) thetys Meek & Worthen. Proc. Acad. Nat. Sci. Phila., 



p. 143. Geol. Rep. 111., vol. v. p. 419, pi. 2, fig. 13. Upper Burl, limest. 



Subcarb. Burlington, Iowa. 

 1861. Pot. (Scaphiocr.) unicus Hall. Desc. New Pal. Crin., p. 8. Bost. Journ. 



Nat. Hist., p. 313. Geol. Rep. 111., vol. v. pi. 15, fig. 5. Keokuk limest. 



Subcarb. Crawfordsville, Ind. 

 1861. Pot. (Scaphiocr.) verticellus Hall. 15th Rep. N. Y. St. Cab., p. 122. 



Hamilton Gr. Devonian. Ontario Co., N. Y. 



b. Species ivith Compound Brachials. 



*1861. Pot. (Scaphiocr.) carinatus Hall (not Poteriocr. carinatus M. & W. = 



Pot. (Pachylocr.) liliiformis M. & W.). Desc. New Pal. Crin., p. 8, Bost. 



Journ. Nat. Hist., p. 310. Upper and Lower Burl, limest. Subcarb. Bur- 

 lington, Iowa. 

 1869. Pot. (Scaphiocr.) clio Meek & AVorthen. Proc. Acad. Nat. Sci. Pbila., p. 



144. Geol. Rep. 111., vol. v. pi. 1, fig. 10. Upper Burl, limest. Subcarb. 



Burlington, Iowa. 

 *1860 Pot. (Scaphiocr.) cultidactylus Hall (Poteriocr. cultidactylus). Supp. 



Geol. Rep. Iowa, p. 62. Lower Burl, limest. Subcarb. Burlington, Iowa. 

 *1843. Pot. (Scaphiocr.) longidactylus Austin (Poteriocr. londactylus) (not 



Shumard, 1855, nor McChesney, 1859). Mon. Rec. and Foss. Crin., p. 88; 



pi. 11. fig. 3 a. Subcarb. England. 

 1878. Pot. (Scaphiocr.) Gibsoni White. Proc. Acad. Nat. Sci. Phila., p. 31. 



Keokuk limest. Crawfordsville, Ind. 

 1878. Pot. (Scaphiocr.) Gurleyi White. Proc. Acad. Nat. Sci. Phila., p. 32. 



Keokuk limest. Crawfordsville, Ind. 

 *1857. Pot. (Scaphiocr.) missouriensis Shumard. First described as Poteriocr. 



longidactylus (Shumard, not Austin). Geol. Rep. Missouri, p. 188, pi. B, 



figs. a-c. St. Louis limest. Subcarb. St. Louis, Mo. 



It differs from all other species in this group in having a single 

 arm to each ray, the first bifurcation taking place at the tenth or 

 twelfth plate. 



*1867. Pot. (Scaphiocr.) multiplex Trautschold (Poteriocr. multiplex). Bull. 



de Moscou, No. 3, p. 6, pi. 2, figs. 1-8 ; also F. Roemer, Lethsea Geognost., 



pi. 40, fig. 11. Trautschold, 1879, Steinbriiche von Mjatsohkowa, p. 112, 



pi. 14, fig. 2, and pi. 15, fig. 1. Upper Subcarb. Near Moscow, Russia. 

 1865. Pot. (Scaphiocr.) Norwoodi Meek & Worthen. Proc. Acad. Nat. Sci. Phila., 



p. 158. St. Louis limest. Subcarb. Hancock Co., 111. 

 *1875. Pot. (Scaphiocr.) proboscidlalis Worthen (Poteriocr. proboscidialis) 



Geol. Rep. 111., vol. vi. p. 518, pi. 31, fig. 1. St. Louis limest. Subcarb. 



St. Louis, Mo. 

 *1860. Pot. (Scaphiocr.) Swallovi Meek & Worthen (Poteriocr. Swallovi). Proc 



Acad. Nat. Sci. Phila., p. 394. Geol. Rep. 111., vol. ii. pi. 16, figs. 4 a, b. 



Upper Burl, limest. Subcarb. Burlington, Iowa. 



