322 CALIFORNIA ACADEMY OF SCIENCES. 



LONCHOCEPHALUS. MICKODISCUS. 



ConocephalUe.H iowexsis Hall, 1863; 16th Rep. New York State Cab. 



Nat. Hist., p. 162, pi. 7, fig. 33; pi. 8, figs. 10-12 and 30. 

 f'repicephaliiti iowen.si.s Wal., 188-4; Bull. U. S. Geol. Siirvey, No. 10, 



p. 36. 

 Crepicephalm iowensls Wal., 1886, Bull. U. S. Geol. Survey, No. 30, 



p. 207. 



sp.? undet. Owen, 1852; Kei). Geol. Wiscousin, Iowa and Minnesota, 



p. 624, No. 8, table 1 a, fig. 15. Near Mountain Island. 

 Crepkephalus liliana Wal., 1886; Bull. U. S. Geol. Survey, No. 



30, p. 209, pi. 28, figs. 3, 3 a, c. Pioclie, also 11 miles north of 



Beunet Springs, etc., Nevada. Tacouic. 



Crepkephalus liliana Wal., 1890; 10th Rep. U. S. Geol. Survey, p. 



653; pi. 96, fig. 4, 4 a. Olenellus zone. 

 Megai^spis Aug., 1852; Palc»ont. Scand., p. 15. 



BELEMNrBUS White, 1874; Rep. Invert. Foss., etc., p. II. 



BELEMNURCS White, 1877; Geol. Survey. W. 100th Meridian, Pal., 



vol, 4, p. 59, pi. 3, fig. 9. Queen Spring Hill, Schell Creek, Nev. 



Asaphus {Afcf/lmpis) (jonioceru.s Meek, 1873; 6th Ann. Rep. Geol. 



Survey Territories, 1872, p. 480. Quebec. 



Mexocephalus Owen, 1852; Rep. Geol. Survej- Wisconsin, Iowa and Min- 

 nesota, p. 577. Dr. D. D. Owen refers one species to this genus, 

 Menocephalus 7ninneso tenuis, jil. 1, fig. 11, which has a highly 

 arched and hemispherical glabella. 



GLOBOSus Bill., 1860; Canadian Naturalist, vol. 5, p. 317, figs. 17-19. 



Point Levis. Taconic. 



GLOBOSUS Bill., 1865; Pal. Foss., vol. 1, p. 408, figs. 388 a-c. 



minnesotensls Owen, 1852; Rep. Geol. Survey Wisconsin, Iowa and 



Minnesota, p. 577, pi. 1, fig. 11. From Miniskah. Taconic. 



SALTERi Bill., 1863; Canadian Naturalist, vol. 8, p. 210, fig. 



SALTERI Bill., 1865; Pal. Foss., vol. 1, p. 203, fig. 187. Point Levis, 



Quebec. Taconic. 

 SALTERI? Rominger, 1887; Proc. Acad. Nat. Sci. Phila., p. 16, pi. 1, 



fig. 6. Mount Stephens, N.W. Terr., Canada. Tacouic. 

 .SEDGWiCKi Bill., 1860; Canadian Naturalist, vol. 5, p. 316, fig. 16. 



Point Levis, Quebec. Taconic. 



SEDGWICKI Bill., 1865; Pal. Foss., vol. 1, p. 407, fig. 387. 



ME.SONACIS Wal., 1885; Am. Jour. Sci., 3d series, vol. 29, p. 329. Mesonacis 



is used as a subgenus to Olenellus by Walcott in the 10th Report 



U. S. Geol. Survey, p. 637. {^ee Olenellus (Mesonacis) vermantana. 

 MiCRODiscus Emmons, 1855; Am. Geologj', vol. 1, pt. 2, p. 116. 

 BELLi-MARGiNATUS S. & F., 1888; Bull. Mus. Comp. Zool. Harvard 



Coll., vol. 16, p. 35, pi. 2, fig. 19. North Attleborough, Mass. 



Taconic. 



