306 CALIFORNIA ACADEMY OF SCIENCES. 



DICELLOCEPHALUS. DOLICHOMETOPUS. 



OSCEOLA Hall, 1863; 16th Kep. New York State Cab. Nat. Hist., p. 146, 



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



- OSCEOLA Wai., 1884; Pal. Eureka Dist. Mon. U. S. Geol. Survey, vol. 



8, p. 40, pi. 9, fig. 25. Prospect 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; Eep. Geol. Survey Wis., Iowa and Minn., p. 



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



- PEPINENSIS Hall, 1863; 16th Hep. New York State Cab. Nat. Hist., p. 



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

 Dlcellocephalus crassimaryinatus) . Lagrange Mt., Minnesota. 



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



PLAXIFRONS Bill., I860; 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 Wai., 1884; Pal. Eureka Dist. Mon U. S. Geol. Sur- 

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

 Nev. Taconic. 



ROEMERI Shum., 1861; Am. Jour. Sci., 2d series, vol. 32, p. 220. 



Clear Creek, Buriiet county, Texas. Potsdam. 



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



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



xesostris Bill. (See Oryctocephalus sesostris.} 



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



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



wahsatchensis. (See Olenoides wahsatchensis.) 



DIOXIDE Barr., 1847; Neues Jahrbuch fur Mineral., vol. 4, p. 391. 

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

 Polytomurus Cord., 1847; Prodr., p. 153. 



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

 ers Div. 4. 



Dipleura Green, 1832; Mon. Tril. North America, p. 79. (See Homalono- 

 tus dekayi. ) 



Discranurus Con., 1841; 5th Kep. Pal. Dept. New York Geol. Survey, p. 

 48. (See Acidaspis hamata.) 



DOLICHOMETOPUS Aug., 1854; Paheont. Scand., p. 72. 



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



Choix, N. F. 



