306 CALIFORNIA ACADEMY OF SCIENCES. 



DICELLOCEPHALUS. DOLICHOMETOPUS. 

 OSCEOLA Hall, 1863; IGtli Eep. New York State Cab. Nat. Hist., p. 146, 



pi. 7, fig. 49; pi. 10, fig. 18. Osceola Mills, Wis. Potsdam. 

 o.scEOLA Wal., 1884; Pal. Eureka Dist. Mou. U. S. Geol. Survey, vol. 



8, p. 40, pi. 9, fig. 25. Prosi^ect Mt., etc., Nevada. 



OWEXI Bill., 1860; Canadian Naturalist, vol. 5, p. 310, fig. 8. Point 



Levis, Quebec. 



OWENi Bill., 1865; Pal. Foss., vol. 1, p. 402, fig. 379. 



PAUPER Bill., 1865; Pal. Foss., vol. 1, p. 200. cf. D. sesostris. Point 



Levis, Quebec. 

 PEPiNENSis Owen, 1852; Hep. Geol. Survey Wis., Iowa and Minn., p. 



574, pil. 1, figs. 9, 9 a; pi. 1 a, fig. 7. Potsdam. 

 PEPINENSIS Hall, 1863; 16tli Eep. New York State Cab. Nat. Hist., p. 



142, pi. 9, figs. 1-4; pi. 10, figs. 13-17. (ExpL, pi. 11, fig. 2. See 

 Dicellocephalus crassimarginains). Lagrange Mt., Minnesota. 



PEPINENSIS Winchell, 1864; Am. Jour. Sci., 2d series, vol. 37, p. 229. 



PLANi^RONS Bill., 1860; Canadian Naturalist, vol. 5, p. 309, fig. 6. 



Point Levis, Quebec. 



PLANiFRONS Bill., 1865; Pal. Foss., vol. 1, p. 401, fig. 377. Point 



Levis. 



quadriceps H. & W. Barrandia quadriceps? 



RiCHMONDENSis Wal., 1884; Pal. Eureka Dist. Mon U. S. Geol. Sur- 

 vey, vol. 8, p. 41, pi. 10, fig. 7. Prosjiect Mt. and Secret Canon, 

 Nev. Tacouic. 



ROEMERi Shum., 1861; Ain. Jour. Sci., 2d series, vol. 32, p. 220. 



Clear Creek, Burnet cotinty, Texas. Potsdam. 



SELECTUS Bill., 1865; Pal. Foss., vol. 1, p. 199. Point Levis, Quebec. 



SELECTusBilL, 1865; Pal. Foss., vol. 1, p. 198. (See Ptychaspis selectus.) 



sesostris Bill. (See Oryctocephalus sesostris.) 



SPINIGER Hall, 1863; 16th Eep. New York State Cab. Nat. Hist., p. 



143, pi. 10, figs. 1, 2, 3(?). Trempleau, Wis. Potsdam. 



wahsatchensis. (See Olenoides ivahsaichensis.) 



Dioxide Barr., 1847; Neues Jahrbuch flir Mineral., vol. 4, p. 391. 

 Syn., Dione Barr.; Notice Prelim. Sil. Syst. Boheme, p. 33. 

 Polytomurus Cord., 1847; Prodr., j). 153. 



? PERPLEXA Bill., 1866; Catalogue Sil. Foss. Auticosti, p. 67. Jump- 

 ers Div. 4. 



Dipleura Green, 18,32; Mon. Tril. North America, p. 79. (See HomaJono- 

 tus dekayi.) 



Discranurus Con., 1841; 5th Eep. Pal. Dept. New York Geol. Survej', -p. 

 48. (See Acidasjns hamata.) 



DoLiCHOMETOPUs Aug., 1854; PaL-eout. Scand., "p. 72. 



?C0NVEXus Bill., 1865; Pal. Foss., vol. 1, p. 269, fig. 253. Port aux 



Choix, N. F. 



