254 CALIFORNIA ACADEMY OF SCIENCES. 



Olexellid.e. 

 Olenellus Hall, 1861. Fifteenth Kep. New York State Cab. Nat. Hist., p. 

 114. Type, Olenellus thomp.soni Hall. Twelfth Eep. New York State 

 Cab. Nat. Hist., p. 59, ti<^ure. Tacouic. 



Paradoxid.i:. 

 Paradoxides Brouguiart, 1822. Hist. Crust. Foss., p. 30. Type, Para- 



doxides iessini Broug. Taconic. 



Auopoleuus Salter, 1864. Geol. Soc.Loudou Jour., vol. 20, p. 236. Tj'pe, 



Anopolemis henrici Salt. Tacouic. 



Bathynotns Hall, 1860. Thirteenth Rep. New York State Cab. Nat. Hist., 



Y>- 117. Type, Bathynotus holopyga'S.till. Taconic. 



Dicellocephalus Owen, 1852. Kep. Geol. Survej^ Wisconsin, Iowa and 



Minnesota, -p- 573. Type, Dik-eloce]>halus minnesotensis Owen. 



Taconic. 

 Dolichometopus Angeliu, 1854. Pah^ont. Scaud., p. 72. Tjqie, Dolicho- 



meiopus svecicus Ang. Pal^eont. Scand., p. 73, pi. 37, tig. 9. Taconic. 

 Hydrocephalus Barrande, 1846. Notice Prelim. Syst. Sil. Bohfeme, p. 18. 



Type, H ijdrocephalus careiis Barr. Taconic. 



EeMOPLEURIDjE. 



Eemoplenrides Portlock, 1843. Geol. Hep. Londonderry, etc., p. 254. 

 Type, Remopleuridcs colbii Portl. 



Olexid.e. 

 Protolenns Matthew, 1892. Bull. Nat. Hist. Soc. N. B., No. 10, p. 2. 



Tyjae, P. de(jans Matt. Taconic. 



Oleuus Dalman, 1826. Palfead., p. 56. Type, Olenus (jihhosus Wahl. 



Tacouic. 

 Zecanthoides AValcott, 1887. Am. Jour. Sci., 3d series, vol. 36, p. 165. 



Type, Olenoidcs spinosus Wal. Taconic. 



Paraboliua Salter, 1849. Mem. Geol. Survey United Kingdom, decade 2. 



Type, Olenus spinulosa Wahl. Taconic. 



Peltura Milne-Edwards, 1840. Hist. Nat. Crust., vol. 3, p. 344. Type, 



Olenus sc.arahiMoides Wahl. Taconic. 



Cyclognathus Linuarsson, 1875. Geol. Poreningens Stockholm Forhandl., 



vol. 2, No. 12, p. 500. Type, Cyrlognathus micropygns Liurs. 



Taconic. 

 Triarthrus Green, 1832. Mon. Trilobites North America, p. 87. Type, 



Triarthrus beckii Green. Cambrian. 



Leptoplastus Angeliu, 1854. Pahvont. Scaud., p. 46. Tyi^e, Leploplastus 



stenotus Aug. Tacouic. 



1. Si^hferoi^hthalmus Angeliu, 1854. Pala'out. Scaud., \). 49. Type, 



Spharophthalmus flagellifer Ang. Tacouic. 



2. Ctenopyge Linuarsson, 1880. Geol. Foreniugens Stockholm 



Forhandl., vol. 5, p. 145. Type, Olenus (Spharophthabnus) 

 pecien Salt. Taconic. 



