CRUSTACEA. 



217 



roemeri, Shumard, 1861, Am. Jour. Sci., 



vol. 32, Potsdam Gr. [Ety. proper 



name.] 



selectus, Billings, 1865, Pal. Foss., Que- 

 bec Gr. [Sig. select.] 

 sesostris, Billings, 1865, Pal. Foss., Que- 

 bec Gr. [Ety. proper name.] 

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



Y., Potsdam Gr. [Sig, bearing spines.] 

 Dicranurus, syn. for Acidaspis. 



hamatusi, see Acidaspis hamata. 

 DiONiDE, Barrande, 1847, in Lith. Proc. 



[p]ty. from the mythological name 



Dione.'] 

 (?) perplexa, Billings, 1866, Catal. Sil. 



Foss. Antic, Anticosti Gr. [Sig. diffi- 

 cult, perplexing.] 

 Dipleum, Green, syn. for Homalonotus. 



dekayi, see Homalonotus dekayi. 

 DiPLicHNiTES, Dawson, 1863, Am. Jour. Sci. 



and Arts, 3rd series, vol. 5. [Ety. 



diplos, double; ichnos, foot-print or 



track.] 

 {enigma, Dawson, 1863, Am. Jour. Sci. & 



Arts, 3rd series, vol. 5, Coal Meas. 



[Sig. obscure, perplexing.] 

 DiPLOSTYLus, Salter, 1863, Quar. Jour. Geo. 



Soc, vol. 19. [Ety. Diplostylus, double- 

 tail ; in allusion to the two pairs of 



appendages to the last segment or 



telson.] 

 dawsoni, Salter, 1863, Quar. Jour. Geo. 



Soc, vol. 19, Coal Meas. [Ety. proper 



name.] 

 DiTHYRocARis, Scouler, 1855, British Pal. 



Rocks. [Ety. dithros, having two 



valves ; cam, shrimp.] 

 belli, H.Woodward, 1870, Geo. Mag., vol. 



8, Mid. Devonian. [Ety. proper name.] 

 carbonaria, Meek & Worthen, 1869, Proc. 



Acad. Nat. Sci. Phil., Coal Meas. [Sig. 



from the Coal Measures.] 

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



Chemung Gr. [Ety. mythological 



name.] 

 DoLiCHOMETOPus, Augeliu, 1852, Palseonto- 



logia Scandinavica. [Ety. doUclws, 



long ; metope, panel, or space between 



two hollows.] 

 (?) convexus, Billings, 1865, Pal. Foss., 



Quebec Gr. [Sig. convex.] 

 gibberrulus, Billings, 1865, Pal. Foss., 



Quebec Gr. [Sig. somewhat humped 



or convex.] 

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



Calciferous Gr. [Sig. rare.] 

 DoLiCHOPTERus, Hall, 1859, Pal. N. Y., vol. 3. 



[Ety. dolicJios, long; pteron, a wing.] 

 macrocheirus. Hall, 1859, Pal. N. Y., vol. 



3, Waterlime Gr. [Sig. long-handed.] 

 ElliptocephaJa, Emmons, 1844, syn. for Glen us. 



asapJioides, see Olenellus asaphoides.] 

 Encrinurus, Emmrich, 1844, Zur Naturge- 



schicte der Trilobiten, im Pruefungs- 



Prog. der Real-Schule, etc [Ety. (?). 

 deltoideus, Shumard, 1855, Geo. Sur. Mo., 



Up. Sil. [Sig. shaped like the Greek 



letter Delta.} 



elegantulus, Billings, 1866, Catal. Sil. Foss. 

 Antic, Anticosti Gr. [Sig. quite ele- 

 gant.] 



excedrensis, Safford. Not defined. 



laevis, Angelin, 1852, Palaeontologia Scan- 

 dinavica, Up. Sil. [Sig. smooth.] 



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

 Quebec Gr. [Sig. extraordinary.] 



multisegmentatus, Portlock, 1843, (Am- 

 phion multisegmentatus) Rep. Geo. of 

 Londonderry, etc., Anticosti Gr. [Sig. 

 having many segments.] 



nereus. Hall, 1867, 20th Reg. Rep. N. Y.. 

 Niagara Gr. [Ety. mythological 

 name.] 



ornatus. Hall & Whitfield, 1875, Ohio Pal., 

 vol. 2, Niagara Gr. [Sig. ornamented.] 



punctatus, Wahlenberg, 1821, Nova Acta 

 Soc. Upsal., Anticosti Gr. [Sig. punc- 

 tated.] 



raricostatus, Walcott, 1877, 29th Reg. 

 Rep. N. Y., Trenton Gr. [Sig. few- 

 ribbed.] 



trentonensis, Walcott, 1877, 29th Reg. 

 Rep. N. Y., Trenton Gr. [Ety. proper 

 name.] 



vigilans, Hall, 1847, (Ceraurus vigilans) 

 Pal. N. Y., vol. 1, Black Riv. & Tren- 

 ton Gr. [Sig. vigilant.] 

 Endt/mion, Billings, 1862. The name being 

 preoccupied for a genus of plants the 

 author proposed Endymionui. 



meeki, see Endymionia meeki. 

 Endymionia, Billings, 1865, Pal. Foss., vol. 

 1. [Ety. proper name.] 



meeki, Billings, 1862, (Endymion meeki) 

 Pal. Foss., vol. 1, Quebec Gr. [Ety. 

 proper name.] 

 EupRooPS, Meek, 1867, Am. Jour. Sci., vol. 

 43. [Ety. eu, very ; pro, forward ; ops, 

 an eye.] 



danae, Meek & Worthen, 1865, (Bellinurus 

 danse) Proc. Acad. Nat. Sci. Phil., Coal 

 Meas. [Ety. proper name.] 

 EuRYPTERus, DeKav, 1825, Ann. Lye. Nat. 

 Hist. N.Y.,voI. 1. [Ety. euros, breadth; 

 pteron, wing or fin.] 



dekayi. Hall, 1859, Pal. N. Y., vol. 3, 

 Waterlime Gr. [Ety. proper name.] 



lacustris, Harlan, 1834, Trans. Geo. Soc. 

 Penn., vol. 1, Waterlime Gr. [Sig. 

 pertaining to a lake or swamp.] 



lacustris var. robustus, Hall, 1859, Pal. N. 

 Y., vol. 3, Waterlime Gr. [Sig. robust.] 



mazonensis, Meek & Worthen, 1868, Am. 

 Jour. Sci., vol. 46, Coal Meas. [Ety. 

 proper name.] 



micropthalmus. Hall, 1855, Pal. N. Y., 

 vol. 3, Waterlime Gr. [Sig. having 

 small eyes.] 



pachycheirus. Hall, 1859, Pal. N. Y., vol. 

 3, Waterlime Gr. [Sig. thick-handed.] 



pulicaris, Salter, 1863, Quar. Jour. Geo. 

 Soc, vol. 19, Coal Meas. [Ety. ptUis, 

 a little gate ; karis, a shrimp.] 



pustulosus. Hall, 1859, Pal. N. Y., vol. 3, 

 Waterlime Gr. [Sig. covered with 

 pustules.] 



