GASTEROPODA. 



155 



Orthonema, Meek & Worthen, 1801, Proc. 

 Acad. Nat. Sci. Phil. [Ety. orthos, 

 straight; nema, a thread.] 



conicum, Meek & Worthen, 1866, Proc. 

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

 a cone.] 



newberryi, Meek, 1871, Proc. Acad. Nat. 

 Sci. Phil., Corniferous Gr. [Ety. 

 proper name.] 



salteri, Meek & Worthen, 1860, (Eunema (?) 

 salteri) Proc. Acad. Nat. Sci. Phil., 

 Low. Coal Meas. [Ety. proper name.] 



subtamiatum, Geinitz, 1866, (Murchisonia 

 subtseniata) Carb. und Dyas in Neb., 

 Coal Meas. [Sig. somewhat banded.] 

 Orthanychia, Hall, 1843, syn. for Platyceras. 

 Orthostoma, Conrad, 1838, Ann. Rep. N. 

 Y. [Ety. orthos , straight ; stoma, 

 mouth.] 



commune, Conrad, 1838, Ann. Rep. N. 

 Y., figured in 1841, Birdseye Gr. [Sig. 

 common.] 

 Pal,eacm;ea, Hall, 1873, 23d Reg. Rep.N. Y. 

 [Ety. palaios, ancient ; Acmxa, an ex- 

 isting genus of shells.] 



typica, Hall, 1873, 23d Reg. Rep. N. Y., 

 Potsdam Gr. [Ety. type of the genus.] 

 Phanerotixus, Sowerby, 1842, Min. Conch. 

 [Ety. phaneros, aperture ; teino, ex- 

 tended.] 



paradoxus, Winchell, 1863, Proc. Acad. 

 Nat. Sci., Chemung Gr. [Sig. para- 

 doxical.] 

 Phragmolites, syn. for Cyrtolites. 



compressus, see Cyrtolites compressus. 

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

 [Ety. phragmos, a partition, stoma, the 

 mouth ; from the septum within the 

 aperture.] 



cumulus, Hall, 1861, 14th Reg. Rep.,Hud. 

 Riv. Gr. [Sig. a heap.] 



cymbula, Hall, 1861, 14th Reg. Rep., Hud. 

 Riv. Gr. [Sig. a small boat.] 



natator, Hall, 1862, loth Reg. Rep., Por- 

 tage and Ham. Gr. [Sig. a swimmer.] 

 The same species Hall identified with 

 Bellerophon expansus of Sowerby, in 

 1843, Geo. Rep. 4th Dist. N. Y. 

 Pileopsis tubifer, syn. for Platyceras dumosum. 



vetustus, Sowerby. Not American. 

 Planorbis, Guettard, 1756, Mem. Acad. Sc. 

 Paris. 



trilobatus, see Bucania trilobatus. 

 Platyceras, Conrad, 1840, Ann. Rep. N. Y. 

 [Ety. plati/s, broad ; keras, horn.] 



agreste, Hali, 1859, Pal. N. Y., vol. 3, 

 Low. Held. Gr. [Sig. pertaining to 

 the fields, coarse.] 



ammon, Hall, 1862, 15th Reg. Rep., Up. 

 Held. Gr. [Ety. mythological name.] 



angulatum, Hall, 1852, (Acroculia angu- 

 lata) Pal. N. Y., vol. 2, Clinton and 

 Niagara Gr. [Sig. angulated.] 



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

 Low. Held. Gr. [Sig. bent.] 



argo, Hall, 1862, 15th Reg. Rep., Up. 

 Held. Gr. [Ety. mythological name.] 



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



Ham. Gr. [Sig. attenuated.] 

 attenuatum. Meek, 1871, Proc. Acad. Nat. 



Sci. Phil., Cornif. Gr. This name was 



preoccupied.] 

 auriculatum, Hall, 1876, Ulust. Devonian 



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

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



Low. Held. Gr. [Ety. proper name.] 

 biserialis, Hall, 1860, Supp. to Geo. Iowa, 



vol. 1, pt. 2, Burlington Gr. [Sig. hav- 

 ing two rows.] 

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



3, Low. Held. Gr. [Sig. double-sin- 



uated.] 

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



3, Low. Held. Gr. [Sig. double- 

 furrowed.] 

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



Ham. Gr. [Sig. large mouthed.] 

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



Low. Held. Gr. [Sig. like a covering 



for the head.] 

 callosum, Hall, 1859, Pal. N. Y ; , vol. 3, 



Oriskany sandstone. [Sig. having a 



thick skin.] 

 campanulatum, Winchell & Marcy, 1865, 



Mem. Bost. Soc. Nat. Hist., Niagara 



Gr. [Sig. bell-shaped.] 

 capulus, Hall, 1860, Supp. Geo. Iowa, 



Burlington Gr. [Sig. a coffin.] 

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



Up. Held. Gr. [Sig. keeled.] 

 cirriformis, Conrad, 1841, Ann. Rep. N. 



Y. Not clearlv defined, 

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



Low. Held. Gr. [Sig. club-like.] 

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



Up. Held. Gr. [Sig. concave.] 

 conicum, Hall, 1862, 15th Reg. Rep., Ham. 



Gr. [Sig. conical.] 

 corniforme, Winchell, 1863, Proc. Acad. 



Nat. Sci., Chemung Gr. [Sig. in the 



form of a horn.] 

 crassum, Hall, 1862, 15th Reg. Rep., Up. 



Held. Gr. [Sig. thick.] 

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



3, Low. Held. Gr. [Sig. bent-beaked.] 

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



Up. Held. Gr. [Sig. a small drinking 



vessel.] 

 cyrtolites, McChesney, 1859, Pal. Foss., 



Coal Meas. [Sig. curved stone.] 

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



Up. Held. Gr. [Sig. a plough share.] 

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



Low. Held. Gr. [Sig. dilated.] 

 dumosum, Conrad, 1S40, Ann. Rep. N. 



Y., Up. Held. Gr. [Sig. bushy.] 

 dumosum far. rarispinum, Hall, 1862, 15th 



Reg. Rep., Up. Held. Gr. [Sig. few 



spined.] 

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



Ham. Gr. [Sig. set with spines.] 

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



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



