256 CALIFORNIA ACADEMY OF SCIENCES. 



Homalouotus Koenig, 1825. Icoues Foss. Sectiles, p. 7. Type, Homa- 

 Jonotus hnlghti Koenig. Cambrian. Silurian. Devonian. 



Bavarilla Barraude, 1868. Faiiue Sil. des environs de Hof en Baviere, 

 13. 75. Tyi^e, Bai-arilla hojmsts Barr. Taconic. 



AS.\PHID^. 



Asaphi;s Brongniart, 1822. Cn;st. Foss., p. 17. Type, Asaphus expansus 



Linue. Cambrian. 



Ptychoi^yge Angelin, 1854. PaLTont. Scaud., p. 51. Tyj^e, Pli/chojjyge 



appcmaia Ang. Cambrian. 



Brachyaspis Salter, 1866. Mou. Brit. Trilobites, p. 167. Type, Isotelus 



rectifrons Portl. and Asaphus Icevigatns Ang. Cambrian. 



Megalaspis Angelin, 1852. Pal^ont. Scand., p. 15. Tyjie, Meyalaspis 



gigas Ang. Cambrian. 



Ogygia Brongniart, 1822. Crust. Foss., p. 26. Tj'pe, Asaphus huchi 



Brong. Cambrian. 



Barrandia McCoy, 1849. Annals Nat. Hist., 2d series, vol. 4, p. 409. 



Tyjje, Barrandia corclai McCoy. Cambriaii. 



Niobe Angelin, 1852. Palseont. Scaud., p. 13. Tyi^e, Asaphus frontalis 



Dalm. Cambrian. 



Asaphellus Callaway, 1877. Quart. Jonr. Geol. Soc. Loudon, vol. 33, 



p. 663. Type, Asajyhellus homfrayi Salt. Taconic. 



Nileus Dalman, 1826. Palasad., p. 49. Type, Aliens armadillo Dalm. 



Cambrian . 



Styginid^e. 



Stygiuia Salter, 1853. Hep. 22d Meeting Brit. Assoc. Adv. Sci., f). 59. 

 Type, Asaphus latifronsVoxi]. Cambrian. 



Ill^nid^. 

 Illrenus Dalman, 1826. Pala^ad., p. 51. Hype, Illxmus crassicaudayf&hX.; 



Nova Acta Beg. Soc. Sci. Upsal., vol. 8, p. 27, pi. 2, figs. 3, 5, 6. 



(Not pi. 7, figs. 5, G^IllcEnus esmarki). Cambrian. Silurian. 



Dysjilanus Biirmeister, 1843. Organization Trilobites, p. 105 (Kay Soc. 



Ed., 1846). Type, I llanus centroUts Balm. Cambrian. 



Bumastus Murchison, 1839. Sil. Syst., p. 656. Type, Bumastus barrien- 



sis Murch. Cambrian. Silurian. 



Panderia Volborth, 1863. Mem. Acad. St. Petersbi;rg, 7th series, vol. 6, 



No. 2, p. 31. Type, Panderia iriquetra Volb. Cambrian. 



^gliua Barraude, 1852. Syst. Sil. Boheme, vol. 1, p. 663. Type, ^Eglina 

 rediviva Barr. Cambrian. 



Ill^nurid^. 

 Illfenurus Hall, 1863. Sixteenth Kep. New York State Cab. Nat. Hist., 

 p. 176. Type, Ilkenurus quadratus Hall. Taconic. 



