CEPHALOPODA. 



177 



pylades, Billings, 1866, Catal. Sil. Foss. 



Antic, Niagara Gr. [Ety. mytho- 

 logical name.} 

 python, Billings, 1857, Kep. of Progr., 



Trenton Gr. [Ety. mythological 



name.] 

 rapax, see Endoceras rapax. 

 raptor, Billings, 1866, Catal. Sil. Foss. 



Antic, Medina Gr. [iSig. a robber.] 

 recedens, Barrande, 1869, Syst. Sil. de 



Boh., 4me ser., Quebec Gr. [Sig. 



receding.] 

 rectiannulatum, Hall, 1847, Pal. N. Y., 



vol. 1, Chazy & Birdseye Gr. [Ety. 



rectus, straight; annulatus, ringed.] 

 recticameratum, Hall, 1847, Pal. N. Y., 



vol. 1, Birdseye Gr. [Ety. rectus, 



straight; cameratus, chambered.] 

 rectum, Worthen, 1875, Geo. Sur. 111., 



vol. 6, Niagara Gr. [Sig. straight.] 

 remus, Billings, 1866, Catal. Sil. Foss. 



Antic. Niagara Gr. [Ety. proper 



name.] 

 repens, Billings, 1865, Pal. Foss., Quebec 



Gr. [Sig. creeping.] 

 rdindatwm, Phillips, 1836, Geol. York., 



Chemung Gr. Not clearly identified 



in this country, 

 richardsoni, Stokes, 1840, Trans. Geo. Soc, 



2nd series, vol. 5, Black Riv. Gr. 



[Ety. proper name.] 

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



Low. Held. Gr. [Sig. rigid.] 

 robustum, Winchell, 1862, Am. Jour. 



Sci., 2nd series, vol. 33, Marshall Gr. 



[Sig. robust.] 

 robustum, Hall, 1876, Illust. Devonian 



Foss., Ham. Gr. The name was pre- 

 occupied. See 0. eriense. 

 rotulatum, Billings, 1857, Rep. of Progr., 



Niagara Gr. [Sig. rounded.] 

 rude, Hall, 1859, Pal. N. Y, vol. 3, Low. 



Held. Gr. [Sig. rude, not polished.] 

 rudicula, Hall, 1876, Illust. Devonian 



Foss., Up. Held. Gr. [Sig. a spatula.] 

 rushense, McChesney, 1860, New Pal. 



Foss., Coal Meas. [Ety. proper name] 

 sayi, Billings, 1865, Pal. Foss., Quebec 



Gr. [Ety. proper name.] 

 scammoni, McChesney, 1861, New Pal. 



Foss., Niagara Gr. [Ety. proper name.] 

 sedgwicki, Billings, 1857, Rep. of Progr., 



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

 selwyni, Billings, 1862, Pal. Foss.,Guelph 



Gr. [Ety. proper name.] 

 servile, Billings, 1865, Pal. Foss., Quebec 



Gr. [Sig. paltry.] 

 shumardi, Billings, 1859, Can. Nat. and 



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



name.] 

 sieboldi, Billings, 1866, Catal. Sil. Foss. 



Antic, Hud. Riv. and Anticosti Gr. 



[Ety. proper name.] 

 simpsoni, Billings, 1859, Rep. of Progr. 



Assiniboine & Saskatchewan Ex. Exp., 



Silurian. [Ety. proper name.] 

 simulator, Hall, 1876, 28th Reg. Rep., 



Niagara Gr. [Sig. an imitator.] 



sordidum, Billings, 1859, Can. Nat. and 

 Geo., vol. 4, Calciferous Gr. [Sig. 

 coarse.] 



striatum, (?) Sowerby, 1812, Min. Conch., 

 Devonian. [Sig. striated.] 



striatolineatum, McChesney. 1861, New 

 Pal. Foss., Niagara Gr. [Ety. ftriatw, 

 striated ; lineatus, lined.] Syn. (?) for 



0. medullare. 



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

 Trenton Gr. [Sig. furrowed.] 



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

 vol. 2, Niagara Gr. [Sig. a channel.] 



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



1, Chazy Gr. This name was preoc- 

 cupied by Portlock in 1843. 



subbaculum, Worthen, 1866, Geo. Sur. 111., 



vol. 1, Niagara Gr. N >t defined. 

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



Low. Held. Gr. [Sig. somewhat like 



net-work.] 

 subulatum, Hall, 1843, 4th Dist. Geo. 



Rep. N. Y., Marcellus shale. [Sig. 



awl-shaned.] 

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



vol. 5, Black Riv. Gr. [Sig. tender.] 

 tenui-annulatum, Hall, 1859, Pal. N. Y., 



vol. 3, Low. Held. Gr. [Sig. having 



slight annulations.] 

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



1, Chazy Gr. [Sig. having slender 



partitions.] 

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



Trenton Gr. [Sig. long, round and 



smooth.] 

 tetricum, Hall, 1862, 15th Reg. Rep.,Scho- 



harie grit. [Si* rude, rough.] 

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



Trenton Gr. [Sig. woven, like a web.] 

 thoas, Hall, 1862,15th Reg.Rep., Schoharie 



grit. [Kty. mythological name.] 

 tityrus, Billings, 1865, Pal. Foss., Quebec 



Gr. [Ety. proper name.] 

 transversum, S. \. Miller, 1875, Cin. 



Quae. Jour. Sci., vol. 2, Cin'ti Gr. 



[Ety. from the transverse lines on the 



shell.] 

 trentonense, see Cvrtoceras trentonense. 

 turbidum, Half & Whitfield, 1875, Ohio 



Pal., vol. 2, Cin'ti Gr. [Sig. dis- 

 ordered.] 

 typus, Saemann, as identified by Hall, 



1876, Illust. Devonian Foss., Marcellus 



shale. [Sig type of the genus.] 

 undulalum., Owen, 1840, Rep. on Min. 



Landft Niagara Gr. [Sig. wavy.] The 



name was preoccupied by Sowerby 



in 1812. 

 undulostriatum, Hall, 1847, Pal. N. Y., 



vol. 1, Trenton Gr. [Sig. wavy-lined.] 

 unionense, Worthen, 1875, Geo. Sur. 111., 



vol. 6, Niagara Gr. [Ety. proper 



name.] 

 varro, Billings, 1866, Catal. Sil. Foss. 



Antic, Niagara Gr. [Ety. proper 



name] 

 velox, Billings, 1865, Pal. Foss., Chazy 



Gr. [Sig. fitted for motion.] 



