256 CALIFORNIA ACADEMY OF SCIENCES. 



Homaloiiotus Koenig, 1825. Icones Foss. Sectiles, p. 7. Type, Homa- 

 lonotus knighti Koenig. Cambrian. Silurian. Devonian. 



Bavarilla Barrande, 1868. Faune Sil. des environs de Hof en Baviere, 

 p. 75. Type, Bavarilla hofensis Barr. Taconic. 



ASAPHIDJE. 

 Asaphus Brongniart, 1822. Crust. Foss., p. 17. Type, Asaphus expansus 



Linne. Cambrian. 



Ptychopyge Angelin, 1854. Palasont. Scand., p. 51. Type, Ptychopyge 



appanata Ang. Cambrian. 



Brachyaspis Salter, 1866. Mon. Brit. Trilobites, p. 167. Type, Jsotelus 



reclifrons Portl. and Asaphus Icevigatus Ang. Cambrian. 



Megalaspis Angelin, 1852. Palaeont. Scand., p. 15. Type, Megalaspis 



gigas Ang. Cambrian. 



Ogygia Brongniart, 1822. Crust. Foss., p. 26. Type, Asaphus buchi 



Brong. Cambrian. 



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



Type, Barrandia cordai McCoy. Cambrian. 



Niobe Augelin, 1852. Paleeont. Scand., p. 13. Type, Asaphus frontalis 



Dalm. Cambrian. 



Asaphellus Callaway, 1877. Quart. Jour. Geol. Soc. London, vol. 33, 



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



Nileus Dalman, 1826. Palread., p. 49. Type, Nileus armadillo Dalm. 



Cambrian. 



STYGINID.E. 



Styginia Salter, 1853. Kep. 22d Meeting Brit. Assoc. Adv. Sci., p. 59. 

 Type, Asaphus lalifrons Portl. Cambrian. 



Illasnus Dalman, 1826. Palaead., p. 51. Type, Illcenus crassicauda Wahl.; 



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



(Not pi. 7, figs. 5, 6=Illcenus esmarki). Cambrian. Silurian. 



Dysplanus Burmeister, 1843. Organization Trilobites, p. 105 (Kay Soc. 



Ed., 1846), Type, Illcenus centrotus Dalm. Cambrian. 



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



sis Murch. Cambrian. Silurian. 



Panderia Volborth, 1863. Mem. Acad. St. Petersburg, 7th series, vol. 6, 



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



.ZEGLINIDJE. 



JEgliua Barrande, 1852. Syst. Sil. Boheme, vol. 1, p. 663. Type, ^glina 



rediviva Barr. Cambrian. 

 ILLJENURIDJE. 



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



p. 176. Type, Illcenurus quadratics Hall. Taconic. 



