142 



PTEROPODA. 



centennialis, Barrett, 1877, Ann. Lye. 



Nat'. Hist., vol. 11, Low. Held. Gr. 



[Ety. the one hundredth year, because 



the description was written in 1876.] 

 communis, Billings, 1871, Can. Nat. & 



GeoL, vol. 6, Potsdam Gr. [Sig. com- 

 mon.] 

 emmonsi. Ford, 1873, Am. Jour. Sci., 3rd 



series, vol. 5, Potsdam Gr. [Ety. 



proper name.] * 



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



Potsdam Gr. [Sig. excellent.] 

 gibbosus. Hall, 1873, 23rd Reg. Rep. N. 



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

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



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

 equal.] 

 ligea, Hall, 1863, (Theca ligea) 15th Reg. 



Rep. N. Y., Up. Held. Gr. [Ety. 



mythological name.] 

 micans, see Hyolithellus micans. 

 primordialis, Hall, 1861, (Theca primor- 



dialis) Geo. Rep. Wis., Potsdam Gr. 



[Sig. first in order.] 

 princeps, Billings, 1871, Can. Nat. & Geol., 



vol. 6, Potsdam Gr. [Sig. primitive.] 

 principalis, Hall, 1876, lUust. Devonian 



Foss., Schoharie Grit. [Sig. principal, 



large.] 

 striatus. Hall, 1876, Illust. Devonian Foss., 



Ham. Gr. [Sig. striated.] 

 Ptekotheca, Salter, 1852, Rep. Brit. Ass'n. 



[Ety. Plerotheca, a winged Theca.} 

 anatiformis. Hall, 1847, (Tellinomya anat- 



iformis) Pal. N. Y., vol. 1, Trenton 



Gr. [Ety. like an Anotifa.] 

 attenuata, Hall, 1861, (Clioderma atten- 



uata) 14th Reg. Rep., Trenton " Gr. 



[Sig. drawn out, attenuated.] 

 canaliculata. Hall, 1861, 14th Reg. Rep., 



Trenton Gr. [Sig. channeled.] 

 expansa, Emmons, 1842, (Delthyris ex- 



pansus) Geo. Rep. N. Y., Black Riv. 



& Trenton Gr. [Sin. spread out.] 

 saffordi. Hall, 1861, 14th Reg. Rep., Tren- 

 ton Gr. [Ety. proper name.] 

 transversa, Salter, 1852, Rep. Brit. Ass'n, 



Hud. Riv. Gr. [Sig. crosswise.] 

 undulata. Hall, 1861, 14th Reg. Rep., 



Trenton Gr. [Sig. wavy.] 

 Pugiunculus aculeatm. see Theca acuTeata. 

 ScENELLA, Billings, 1873, Can. Nat. & Geol. 



and Pal. Foss., vol. 2. [Ety. scene, a 



tent; ella, diminutive.] 

 reticulata, Billings, 1873, Pal. Foss., vol. 



2, Huronian Gr. [Sig. like net-work.] 

 retusa. Ford, 1873, Am. Jour. Sci. & Arts, 



3rd series, vol. 5, Low. Potsdam Gr. 



[Sig. blunted.] 

 Stenothega, Plicks, 1872, Quar. Jour. Geo. 



Soo. [Ety. .stenos, narrow ; Theca, a 



gen as of Pteropods.] 

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



Huronian Gr. [Sig. impoverished.] 

 Tentaculites, Schlotheim, 1820, Petrefacten. 



[Ety. tentacuZum, a feeler; liihos, stone.] 

 arenosus. Hall, 1876, Illust. Devon. Foss., 



Oriskany sandstone. [Sig. sandy.] 



attenuatus. Hall, 1876, Illust. Devonian 



Foss., Ham. Gr. [Sig. attenuated. j| 

 bellulus. Hall, 1876, Illust. Devonian 



Foss., Ham. Gr. [Sig. beautiful.] 

 distans. Hall, 1852, Pal. N. Y., vol. 2, 



Clinton Gr. [Sig. distant.] 

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



Low. Held. Gr. [Sig. lengthened.] 

 fissurella. Hall, 1843, Geo. Rep. 41fh Dist. 



N. Y., Marcellus shale. [Sig. a little 



cleft] 

 flrxuosa, see Conchicolites flexuosus. 

 hoyti. White, 1876, Proc. Acad. Nat. Sci., 



Devonian. [Ety. proper name.] 

 gyracanthus, Eaton, 1832, (Echinus gy- 



racanthus) Geo. Text-book, Low. 



Held Gr. [Sig. round spine.] 

 incurvus, Shumard, 1856, Geo. Rep. Mo., 



Trenton Gr. [Sig. incurved.] 

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



syn. for Tentaciilites gyracanthus. 

 minutus. Hall, 1843, Geo. Rep. 4th Dist. 



N. Y., Clinton Gr. [Sig. small.] 

 niagarensis. Hall, 1852, Pal. N. Y., vol. 2, 



Niagara Gr. [Ety. proper name.] 

 ornatus, Sowerby, 1839_, Murch. Sil. Syst., 



Water lime (Jr. [Sig. adorned.] 

 oswegoensis, Meek & Worthen, 1865, 



Proc. Acad. Nat. Sci. Phil., Cin'ti Gr. 



[Ety. proper name.] 

 richmondensis, S. A. Miller, 1874, Cin. 



Quar. Jour. Sci., Cin'ti Gr. [Ety. 



proper name.] 

 scalariformis. Hall, 1876, Illust. Devonian 



Foss., Up. Held. Gr. [Sig. like-T. 



scalaris.'] 

 scalaris, Schlotheim, 1820, Petref. t. 29, 



Cornif. Gr. [Sig. like a ladder.] Not 



an American species, 

 sicula. Hall, 1876, Illust. Devonian Foss., 



Up. Held. Gr. [Sig. a little dagger.] 

 spicula. Hall, 1876, Illust. Devonian 



Foss., Chemung Gr. [Sig. a dart] 

 sterlingensis. Meek & Worthen, 1865, 



Proc. Acad. Nat. Sci. Phil., Cin'ti Gr. 



[Ety. proper name.] 

 subtilis, Winchell, 1866, Rep. Low. Pen- 

 insula Mich., Ham. Gr. [Sig. very 



slender.] 

 tenuistriatus. Meek & Worthen, 1865, 



Proc. Acad. Nat. Sci. Phil., Cin'ti Gr. 



[Sig. finely striated.] 

 Theca, Sowerby, 18 45, Morris' Memoir 



Strezelscki's N. S. Wales. [Ety. a 



sheath or case.] 

 aculeata, Hall, 1860, 13th Reg. Rep., 



Ham. Gr. [Sig. sharpened.] 

 gregaria. Meek & Hayden, 1861, Proc. 



Acad. Nat. Sci. Phil., Potsdam Gr. 



[Sig. o^urring in masses.] 

 ligea, see Hyolithes ligea. 

 parviuscula, Hall, 1862, Geo. Eep. Wis., 



Hud. Riv. Gr. [Sig. very small.] 

 primordialis, see Hyolithes primordialis. 

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



Hud. Riv. Gr. This name was pre- 

 occupied by Portlock in 1843. Billings 



described it as Hyolithes americanv3._ 



