258 CALIFORNIA ACADEMY OP SCIENCES. 



ACIDASPID^;. 



Acidaspis Murchison, 1839 (Odontopleura Emmrich, 1839). Silurian Sys- 

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



Cambrian. Silurian. Devonian. 



LICHASID2E. 



Lichas Dalmau, 1826. Palasad., p. 53. Type, Lichas laciniatus Wahl. 



Cambrian. Silurian. 

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



Type, Lichas ( Terataspis) yrandis Hall. Devonian. 



PROETID^E. 

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



Proetus cuvieri Stein. 



Cambrian. Silurian. Devonian. Carboniferous. 

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



p. 703. Type, ^Eonia verticalis Burm. Devonian. 



Prionopeltis Corda, 1847 (Phseton. Barr., Phaethonides Aiigelin). Prodr., 



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



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



Proetus loveni Barr. Silurian. 



Celmus Angelin, 1852. Palrcont. Scaiid., p. 23. Type, 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 (Eay Soc. Ed., p. 98). 



Phacops ceratophthalma Goldf. Cambrian. Silurian. Devonian. 

 Arethusina Barrande, 1852. Syst. Sil. Boheme, vol. 1, p. 494. Arethusina 



konincki Barr. Cambrian. Silurian. Devonian. 



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



hospes Beyr. Taconic. Cambrian. 



Cannon Barrande, 1872. Syst. Sil. Boheme, vol. 1, suppl., p. 19. Type, 



Carmon tnultilus Barr. Cambrian. 



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



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



PHILLIPSIDJE. 

 Phillipsinella Novak, 1885. Sitzungsber. k. bohri. Gesell. Wiss., 1885. 



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



Cambrian. 

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



Phillipsia kelli Portl. = Asaphus gemmulifera Phill. 



Carboniferous. Permian. 

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



Griffithides lonyiceps Portl. Carboniferous. 



HARPESID^E. 

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



Harpes ungula Sternb. Cambrian. Silurian. Devonian. 



