CRUSTACEA. 



211 



romingeri, Waloott, 1876, Desc. New Pal. 

 Foss., Black Riv. & Trenton Gr. [Ety. 

 proper name.] 



selenurus, see DalirJanites selenurus. 



stokesi, see Proetus stokesi. 



tetragonocephalus,Green, 1834,Arn. Jour. 

 Sci., vol. 25. [Sig. square-headed.] 



trentonensis, see Lichas trentonensis. 



trimblii, Green, 1837, Jour. Acad. Nat. 

 Sci. Phil., vol. 7, Niagara Gr. [Ety. 

 proper name.] 



vetustus, Hall, 1847, (Ogvgia vetustus) 

 Pal. N. Y., vol. 1, Trenton & Hud. 

 Riv. Gr. [Sig. ancient.] 



wisconsinensis, Walcott, 1876, Desc. New 

 Sp. Foss., Trenton Gr. [Ety. proper 

 name.] 

 Atops, Emmons. Syn. for Triarthrus. 



trilineatus, see Triarthrus trilineatus. 

 Barrandia, Hall, 1860. The name was pre- 

 occupied by McCov 1849, and Ole- 

 nellus was afterwards substituted. 



thompsoni, see Olenellus thompsoni. 



vermontana, see Olenellus vermontanus. 

 Bathyxotu.s, Hall, 1860, 18th Reg. Rep. N. 

 Y. [Ety. bathys, ample; notos, the 

 back ; in allusion to the ample central 

 lobe or axis of the typical species.] 



holopvga, Hall, 1859, (Olenellus holo- 

 pyga) 12th Reg. Rep. N. Y., Potsdam 

 Gr. [Ety. holos, entire, all ; pygos, 

 rump.] 

 BathyUKEllus, Billings, 1865, Pal. Foss. 

 [Ety. diminutive of Batkt/urut,oi which 

 it is a subgenus.] 



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

 bec Gr. [Sig. abrupt.] 



bradleyi, Meek, 1872, Hayden'sGeo. Rep., 

 Quebec Gr. [Ety. proper name.] 



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

 bec Gr. [Sig. spread out.] 



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

 bec Gr. [Sig. beautiful.] 



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

 bec Gr. [Sig. fraternal.] 



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

 bec Gr. [Sig. occurring on the beach.] 



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

 bec Gr. [Sig. bordered.] 



nitidus, Billings, 1865, Pal. Foss., Quebec 

 Gr. [Sig. neat, pretty.] 



rarus, Billings, 1865, Pal. Foss., Quebec 

 Gr. [Sig. rare.] 



truncatus, Meek, 1872, Hayden's Geo. 

 Rep., Potsdam Gr. [Sig. truncated.] 



validus/Billings, 1865, Pal. Foss., Quebec 

 Gr. [Sig. strong.] 



wheeleri, Meek, 18 72, Hayden's Geo. 



Rep., Quebec Gr. [Ety. propername.] 



BATiiYtRus, Billings, 1859, Can. Nat. & 



Geo., vol. 4. [Ety. bathys, deep; oura, 



the tail.] 



amplimarginatus, Billings, 1859, Can. 

 Nat. & Geo., vol. 4, Calciferous Gr. 

 [Sig. full-bordered.] 



angelini, Billings, 1859, Can. Nat. & 

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

 name.] 



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



Quebec Gr. [Sig. bent.] 

 armatus, Billings, 1860, Can. Nat. & 



Geo., vol. 5, Quebec Gr. [Sig. armed.] 

 bituberculatus, Billings, 1860, Can. Nat 



& Geol., vol. 5, Quebec Gr. [Sig. 



double-tuberculated. ] 

 breviceps, Billings, 1865, Pal. Foss., vol. 



1, Quebec Gr. [Sig. short-headed.] 

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



vol. 5, Quebec Gr. [Sig. large.] 

 caudatus, Billings, 1865, Pal. Foss., vol. 



1, Quebec Gr. [Sig. having a tail.] 

 conicus, Billings, 1859, Can. Nat. & Geo., 



vol. 4, Calciferous Gr. [Sig. conical.] 

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



vol. 5, Calciferous Gr. [Ety. proper 



name.] 

 cybele, Billings, 1859, Can. Nat. & Geol., 



vol. 4, Calciferous Gr. [Ety. mytho- 

 logical name.] 

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



vol. 5, Quebec Gr. [Sig. doubtful.] 

 extans, Hall, 1847, (Asaphus extans) Pal. 



N. Y., vol. 1, Trenton Gr. [Sig. stand- 

 ing up.] 

 gregarius, Billings, 1865, Pal. Foss., vol. 



1, Potsdam Gr. [Sig. occurring in 



flocks.] 

 haydeni, Meek, 1872, Hayden's Geo. Rep., 



Potsdam Gr. [Ety. proper name.] 

 longispinus, Walcott, 1876, Desc. New 



Sp. Foss., Black Riv. & Trenton Gr. 



[Sig. long-spined.] 

 minganensis, Billings, 1S65, Pal. Foss., 



vol. 1, Calciferous Gr. [Ety. proper 



name.] 

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



Quebec Gr. [Ety. proper name.] 

 oblongus, Billings, 1860, Can. Nat. & 



Geol., vol.5, Quebec Gr. [Sig. oblong.] 

 parvulus, Billings, 1861, Pal. Foss., vol. 



1, Potsdam Gr. [Sig. very small.] 

 perplexus, Billings, 1865, Pal. Foss., vol. 



1, Potsdam Gr. [Sig. intricate, per- 

 plexing.] 

 perspicator, Billings, 1865, Pal. Foss., vol. 



1, Quebec Gr. [Sig. sharp-sighted; 



from the large eyes.] 

 quadratus, Billings, 1860, Can. Nat. & 



Geo., vol. 5, Quebec Gr. [Sig. square- 

 shaped.] 

 saffordi, Billings, 1860, Can. Nat. &Geo., 



vol. 5, Quebec Gr. [Ety. proper 



name.] 

 senectus, Billings, 1861, Pal. Foss., vol. 



1, Potsdam Gr. [Sig. extreme age.] 

 serratus, Meek, 1872, Hayden's Geo. Rep., 



Potsdam Gr. [Sig. serrated. ] 

 smithi, Billings, 1862, Pal. Foss., vol. 1, 



Black Riv. Gr. [Ety. proper name.] 

 solitarius, Billings, 1865, Pal. Foss., vol. 



1, Quebec Gr. [Sig. solitary.] 

 spiniger, Hall, 1847, (Acidaspis spiniger) 



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

 ton Gr. [Sig. spiny.] 

 strenuus, Billings, 1865, Pal. Foss., vol. 



1, Quebec Gr. [Sig. vigorous.] 



