258 CALIFORNIA ACADEMY OF SCIENCES. 



AC'IUASPIU^. 



Acidaspis Murchisou, 1839 (Odoiitoplenra Emmrich, 1839). Sihiiiau Sj's- 

 tem, p. 558. Type, Acidaspis brighiii Murch. 



Cambrian. Silniiau. Devonian. 

 L1CH.4.SID.S;. 

 Lichas Dahnan, 1826. Paliisad., p. 53. Type, Lichas lacinialus Wahl. 



Cambrian. Silurian. 



Terataspis Hall, 1863. 16th Rep. New York State Cab. Nat. Hist., p. 223. 



Type, Lichas (Terataspis) grandis Rail. Devonian. 



PROETIDiE. 



Proetus Steininger, 1831. Mem. Soc. GiJol. France, vol. 1, p. 355. Type, 



Proetiis cuvieri Stein. 



Cambrian. Silurian. Devonian. Carboniferous. 

 Dechenella Kayser, 1880. Zeitschr. Deutscb. Geol. Gesell., Berlin, vol.32, 



1). 703. Tj'pe, .'Eonia verticalis Burm. Devonian. 



Priouopeltis Corda, 1847 (Phaeton Barr., Phfethonides Angelin). Prodr., 



p. 121. Type, Prionopelies polydorus Cord. Devonian. 



Xiphogomium Corda, 1847. Prodr., p. 70. Type (X. sieberianum Cord.) 



Proetus lovcni BaiT. Silurian. 



Celmus Angelin, 1852. Palreout. Scand., p. 23. Tj'pe, C. granulatus 



Ang. Cambrian. 



Brachymetopus McCoy, 1847. Annals Mag. Nat. Hist., 1st series, London, 



vol. 20, p. 229. Type, Phillipsia maccoyi Portl. Carboniferous. 



Cyphaspis Burmeister, 1843. Org. Trilobiten (Ray Soc. Ed., p. 98). 



Phacops ceratophthalma Goldf. Cambrian. Silurian. Devonian. 

 Arethusina Barrande, 1852. Syst. Sil. Boh&me, vol. 1, p. 494. Arethvsinn 



konincki Barr. Cambrian. Silurian. Devonian. 



Harpides Beyrich, 1846. Untersucli. Trilobiten, p. 34. Type, Harpides 



hospes Beyr. Taconic. Cambrian. 



Carmon Barrande, 1872. Syst. Sil. Boht-me, vol. 1, suppl., p. 19. Tj-pe, 



Cannon multilus Barr. Cambrian. 



Cyphoniscus Salter, 1852. Rep. 22d Meeting Brit. Assoc. Adv. Sci., 



Trans. Sec, p. 95. Type, Cyphoniscus socialis Salt. Cambrian. 



PHILLIPSIOa:. 



Pkillipsinella Novitk, 1885. Sitzungsber. k. bohn. Gesell. Wiss., 1885. 

 Author's edition, p. 4. Type, Phillipsia parabola Barr. 



Cambrian. 

 Phillipsia Portlock, 1843. Geol. Rep. Londonderry, etc., p. 305. Type, 

 Phillipsia kelli Portl. = Asaphus gemmulifera Phill. 



Carboniferous. Permian. 



Griffithides Portlock, 1843. Geol. Rep. Londonderry, etc., p. 310. Type, 



Grijithides longiceps Portl. Carboniferous. 



HARPESID^aS. 



Harpes Goldfuss, 1839. Nova Acta Physico-Med., vol. 19, p. 358. Type, 

 Harpes ungula Sternb. Cambrian. Silurian. Devonian. 



