CEUSTAOEA. 



209 



danai, Hall, 1862, Geo. Sur. Wis., Niagara 



• Gr. [Ety. proper name.] 



eiiopii, see Terataspis eriopis. 



grandis, see Terataspis grandis. 



halli, Shumard, 18 55, Geo. Sur. Mo., 



Trenton Gr. [Ety. proper name. J 

 hamata, Conrad, 1841, (Dicranurus ham- 



atus) Ann. Rep. N. Y., IjOw. Held. 



Gr. [Sig. hooked.] 

 horani, Billings, 18 5 9, Rep. of Progr., 



Trenton Gr. [Ety. proper name.] 

 ida, syn. for Acidaspis danai. 

 onealli, S. A. Miller, 1875, Gin. Quar. 



Jour. Sci., vol. 2, Cin'ti Gr. [Ety. 



proper name.] 

 parvula, Walcott, 1877, 29tli Reg. Rep. 



N. Y., Trenton Gr. [Sig. very small.] 

 spinu/er, see Bathyurus spiniger. 

 trentonensis. Hall, 1847, Pal. N. Y., vol. 



1, Trenton Gr. [Ety. proper name.] 

 tuberculata, Conrad, 1840, Ann. Rep. N. 



Y., Low. Held. Gr. [Sig. tubercu- 



lated.] 

 Aglaspis, Hall, 1863, 16th Reg. Rep. & 1862, 



Can. Nat. & Geo., vol. 6. [Ety. Aglaos, 



bright; aspis, shield.] 

 barrandi. Hall, 1863, 16th Reg. Rep. N. 



Y., Potsdam Gr. [Ety. proper name.] 

 Agnostus, Brongniart, 1822, Hist. Nat. Crust. 



Foss. [Ety. agnostos, obscure.] 

 acadicus, Hartt, 1868, Acad. Geol., St. 



John's Gr. [Ety. proper name.] 

 americanus, Billings, 1860, Can. Nat. & 



Geol., vol. 5, Quebec Gr. [Ety. proper 



name.] 

 bidens. Meek, 1872, Playden's Geo. Rep., 



Potsdam Gr. [Sig. two-pronged.] 

 canadensis, Billings, 1860, Can. Nat. & 



Geol., vol. 5, Quebec Gr. [Ety. proper 



name.] 

 coloradoensis, Shumard, 1861, Am. Jour. 



Sci. & Arts, Potsdam Gr. [Ety. proper 



name.] 

 disparilis. Hall, 1863, 16th Reg. Rep. N. 



Y., Potsdam Gr. [Sig. unequal.] 

 fabius, Billings, 1865, Pal. Foss., vol. 1, 



Quebec Gr. [Ety. proper name.] 

 galba, Billings, 1865, Pal. Foss., vol. 1, 



Quebec Gr. [Ety. proper name.] 

 interstrictus, White, 1874, Rep. Invert. 



Foss., Potsdam Gr. [Sig. drawn to- 

 gether.] 

 josepha. Hall, 1863, 16th Reg. Rep. N. Y., 



Potsdam Gr. [Ety. proper name.] 

 latus, see Beyrichia lata, 

 lobatus. Hall, 1847, Pal. N. Y., vol. 1, 



Hud. Riv. Gr. [Sig. lobate.] 

 maladensis. Meek, 1872, Hayden's Geo. 



Rep., Calciferous Gr. [Ety. proper 



name.] 

 nobilis, Ford, 1872, Am. Jour. Sci., 3rd 



series, vol. 3, Potsdam Gr. [Sig. ex- 

 cellent.] 

 orion, Billings, 1860, Can. Nat. & Geol., 



vol. 5, Quebec Gr. [Ety. mythological 



name.] 

 parilis. Hall, 1863, 16th Reg. Rep. N. Y., 

 Potsdam Gr, [Sig. like, equal.] 

 27 



synilis, Hartt, 1868, Acad. Geol., St. John's 



Gr. [Sig. similar, from resemblance 



to A. acadicus.'] 

 Ageaulos, Corda, 1847, Bohemian Trilobites. 



[Ety. proper name.] 

 affinis, Billings, 1874, Pal. Foss., vol. 2, 



Potsdam Gr. [Sig. near to ; closely 



allied to A. socialis.} 

 oweni. Meek & Hayden, 1861, (Arionel- 



lus oweni) Proc. Acad. Nat. Sci. Phil., 



Potsdam Gr. [Ety. proper name.] 

 socialis, Billings, 1874, Pal. Foss., vol. 2, 



Potsdam Gr. [Sig. living in groups.] 

 strenuus, Billings, 1874, Pal. Foss., vol. 



2, Potsdam Gr. [Sig. vigorous.] 

 Ampiiion, Pander, 1830, Beitrage zur Geog- 



nosie des Rnssischen Reiches. [Ety. 



mythological name.] 

 barrandi, Billings, 1865, Pal. Foss., vol. 1, 



Quebec Gr. [Ety. proper name.] 

 canadensis, Billings, 1859, Can. Nat. and 



Geol., vol. 4, Chazy Gr. [Ety. proper 



name.] 

 convexus, Billings, 1865, Pal. Foss., vol. 



1, Quebec Gr. [Sig. convex.] 

 insularis, Billings, 1865, Pal. Foss., vol. 1, 



Qucljec Gr. [Sig. on an island.] 

 Julius, Billings, 1865, Pal. Foss., vol. 1, 



Queljec Gr. [Ety. proper name.] 

 matutinus. Hall, 1863, 16th Reg. Rep. N. 



Y., Potsdam Gr. [Sig. in the morning.] 

 niaUixtymerdatiiSjSee Encrinurus multiseg- 



mentatus. 

 salteri, Billings, 1861, Can. Nat. & Geol., 



vol. 6, Calciferous Gr. [Ety. proper 



name.] 

 westoni, Billings, 1865, Pal. Foss., vol. 1, 



Quebec Gr. [Ety. proper name.] 

 Amfuipeltis, Salter, 1863, Quar. Jour. Geo. 



Soc, vol. 19. [Ety. amphi, doubtful; 



peltis, provided with a shield or 



buckler.] 

 paradoxus, Salter, 1863, Quar. Jour. Geo. 



Soc, vol. 19, Devonian. [Sig. extra- 

 ordinary.] 

 Ampyx, Dalman, 1827, Monograph of Trilo- 

 . bites. [Ety. mythological name.] 

 halli, Billings, 1861, Pal. Foss., vol. 1, 



Chazy Gr. [Ety. proper name.] 

 laeviusculus, Billings, 1865, Pal. Foss., 



Quebec Gr. [Sig. quite smooth.] 

 normalis, Billings, 1865, Pal. Foss., vol. 

 '1, Quebec Gr. [Sig. according to the 



square.] 

 rutilius, Billings, 1865, Pal. Foss., vol. 1, 



Quebec Gr. [Ety. proper name.] 

 semicostatus, Billings, 1865, Pal. Foss., 



vol. 1, Quebec Gr. [Sig. half-ribbed.] 

 Anopolenus, Salter, 1864, Geo. Mag., vol. 1. 



[Ety. a, without ; ops, an eye ; olena, 



convexity.] 

 venustus, Billings, 1874, Pal. Foss., vol. 



2, Low. Potsdam Gr. [Sig. beautiful.] 

 Anthraconectes, Meek & Worthen, 1868, 



Am. Jour. Sci., vol. 46. [Ety. anthrax, 



coal ; nectos, swimming. ] A subgenus 



of Eurypterus, founded upon E. 

 mazoncmis, as the type. 



