CEPHALOPODA. 



179 



Trematodiscus, Meek & Worthen, 1861, 



Proc. Acad. Nat. Sci. Phil. [Ety. 



trema, a hole; diskos, a quoit.] 

 altidorsalis, Winchell, 1862, Proc. Acad. 



Nat. Sci., Marshall Gr. [Sig. high- 

 backed.] 

 discoidalis, Winchell, 1862, Am. Jour. 



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



[Sig. discoidal.] 

 meekanus, Winchell, 1862, Am. Jour. 



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



[Ety. proper name.] 

 planidorsalis, Winchell, 1862, Am. Jour. 



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



[Sig. smooth-backed.] 

 strialulus, Winchell, 1862, Proc. Acad. 



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



Gr. [Sig. small-channeled.] 

 strigatus, Winchell, 1862, Proc. Acad. Nat. 



Sci., Marshall Gr. [Sig. grooved.] 

 trigonus, Winchell, 1862, Am. Jour. Sci., 



2nd series, vol. 33, Marshall Gr. [Sig. 



three-cornered.] 

 trisulcatus. Meek & Worthen, 1860, Proc. 



Acad. Nat. Sci. Phil., Kinderhook Gr. 



[Sig. three-furrowed.] 

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



[Ety. trochoa, a hoop ; keras, a horn ] 



This name was proposed by Barrande 



at about the same time, 

 baeri. Meek & Worthen, 1865, Proc. Acad. 



Nat. Sci. Phil., Oin'ti Gr. [Ety. 



proper name.] 

 bannisteri, Winchell & Marcy, 1865, (Gy- 



roceras bannisteri) Mem. Bost. Soo. 



Nat. flist, vol. 1, Niagara Gr. [Ety. 



proper name.] 



Clio, Hall, 1861, 14th Reg. Rep., Schoharie 



grit. [Ety. mythological name.] 

 costatum, Hall, 1861, Geo. Rep. of Wis., 



Niagara Gr. [Sig. ribbed.] 

 desjilainense, McChesney, 1860, New 



4'al. Foss., Niagara Gr. [Ety. proper 



name.] 

 discoideum. Hall, 1862, 15th Reg. Rep., 



Schoharie grit. [Sig. disc-like.] 

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



Schoharie grit. [Ety. proper name.] 

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



Coralline Gr. [Ety. proper name.] 

 incipiens, Barrande, 1869, Syst. Sil. de 



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



beginning.] 

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



Niagara Gr. [Sig. well known.] 

 obliquatum. Hall, 1876, Illust. Devonian 



Foss., Up. Held. Gr. [Sig. bent] 

 paudion. Hall, 1876, Illust. Devonian 



Foss., Si-hoharie grit. [Ety. mytho- 

 logical name.] 

 turbinatum. Hall, 1852, Pal. N. Y., vol. 



2, Coralline Gr. [Sig. top-shaped.] 

 waldronense, JHall, 1876, 28th Reg. Rep. 



N.Y., Niagara Gr. [Ety. propername.] 

 Trocholites, Conrad, 1838, Ann. Geo. Rep. 



N. Y. [Ety. trochos, a hoop; Kthos, 



stone.] 

 ammonius, Conrad, 1838, Ann. Geo. Rep. 



N. Y., Trenton, Utica & Hud. Riv. Gr. 



[Ety. mythological name.] 

 planorbiformis, Conrad, 1842, Jour. Acad. 



Nat. Sci. Phil., Utica and Hud. Riv. 



Gr. [Sig. like a shell of the genus 



Planorbis.1 



