322 CALIFORNIA ACADEMY OF SCIENCPJS. 



L0NCH0CEPHALU8. MICEODISCUS. 



Conoceiihalltes iowexsi.s Hall, 1863; IGtli Eep. New York State Cab. 



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

 Crepicephahis iowensis Wal., 1884; Bull. U. S. Geol. Survey, No. 10, 



p. 36. 

 CrepicephnliiK iowensis Wal., 1886, Bull. V. S. Geol. Survey^' No. 30, 



p. 207. 

 . sp.? undet. Owen, 1852; Eep. Geol. Wisconsin, 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 



Bennet Springs, etc., Nevada. Taconic. 



Crepkephalus liliana Wal., 1890; lOtli Eep. U. S. Geol. Survey, p. 



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

 Megalaspis Aug., 1852; Pakeont. Scaud., p. 15. 



BELEMNURUS White, 1874; Eep. Invert. Foss., etc., p. 11. 



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



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



Asaphus (Meglaspis) goxiocerus Meek, 1873; 6th Ann. Eep. Geol. 



Survey Territories, 1872, p. 480. Quebec. 



Menocephalus Owen, 1852; Eep. Geol. Survey Wisconsin, Iowa and Min- 

 nesota, p. 577. Dr. D. D. Owen refei's one species to this genus, 

 Menocephalus minnesotensis, pi. 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. 



MINNESOTENSIS Oweii, 1852; Eep. Cieol. 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? Eominger, 1887; Proc. Acad. Nat. Sci. Phila., p. 16, pi. 1, 



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

 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. 



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



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



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

 MiCRODiscus Emmons, 1855; Am. Geolog}', vol. 1, jjt. 2, p. 116. 



BELLi-MARGiNATus S. & F., 1888; BuU. Mus. Comi). Zool. Harvard 



Coll., vol. 16, p. 35, 1)1. 2, fig. 19. North Attleborough, Mass. 



Taconic. 



