NAT — OPH.] 



GASTEROPODA. 



413 



vesta, Billings, 1862, Pal. Foss., vol. 1, p. 

 32, Calciferous Gr. 



vincta, Hall, 1858, (Loxonema vincta,) 

 Trans. Alb. Inst., vol. 4, p. 28, and Bull. 

 Am. Mus. Nat. Hist., p. 88, War- 

 saw Gr. 



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

 p. 156, Guelpn Gr. 



viitata, see Fusispira vittata. 



worthenana, S. A. Miller, 1882, Jour. 

 Cin. Soc. Nat. Hist., vol. 5, p. 225, 

 Niagara Gr. 



xanthippe, Billings, 1862, Pal. Foss., vol. 

 1, p. 155, Guelph Gr. 

 Natica, Adanson, 1757, Histoire Naturelle 

 du Senegal, p. 172. [Ety. nato, to swim 

 with a fluctuating motion.] This genus 

 is unknown in Palaeozoic rocks. 



altonensis, see Naticopsis altonensis. 



carleyana, see Naticopsis carleyana. 



chesterensis, see Naticopsis chesterensis. 



littonana, see Macrochilina littonana. 



magister, syn. for Naticopsis ventricosa. 



shumardi, see Naticopsis shumardi. 



ventricosa, see Naticopsis ventricosa. 

 Naticopsis, McCoy, 1844, Synop. Carb. Foss. 

 Ireland, p. 33. [Ety. from resemblance 

 to the genus Natica.) Subglobose, solid, 

 imperforate ; whorls few, convex, rap- 

 idly expanding, last- one large ; spire 

 short ; aperture subovate, straighter on 

 the inner side, rounded below ; colu- 

 mella callous, flattened, longitudinal im- 

 pression for the operculum ; lip sharp, 

 entire ; surface smooth in part or 

 marked with oblique striae. Type N. 

 phillipsi. 



aequistriata, Meek, 1871, Proc. Acad. Nat. 

 Sci., p. 76, and Ohio Pal., vol. 1, p. 216, 

 Up. Held Gr. 



altonensis, McChesney, 1865, (Natica al- 

 tonensis,) Desc. New. Pal. Foss., and 

 Geo. Sur. 111., vol. 5, p. 595, Coal 

 Meas. 



carleyana, Hall, 1858, (Natica carleyana,) 

 Trans. Alb. Inst., vol. 4, p. 31, and Bull. 

 Am. Mus. Nat. Hist., p. 71, Warsaw Gr. 



chesterensis, Swallow, 1863, Trans. St. 

 Louis Acad. Sci., vol. 2, p. 100, Kas- 

 K^mlci'i (tt* 



comperta, Hall, 1879, Pal. N. Y., vol. 5, 

 pt. 2, pi. 29, Up. Held. Gr. 



cretacea, Hall & Whitfield, 1873, 23d Rep. 

 N. Y. Mus. Nat. Hist., p. 240, Up. 

 Held. Gr. 



depressa, Winchell, 1863, Proc. Acad. Nat. 

 Sci., p. 22, Marshall Gr. 



dispassa, Dawson, 1868, Acad. Geol., p. 

 309, Carbonif. 



gigantea, Hall & Whitfield, 1873, 23d Rep. 

 N. Y. Mus. Nat. Hist., p. 238, Che- 

 mung Gr. 



hollidayi, see Trachydomia hollidayi. 



howi, Hartt, 1868, Acad. Geol., p. 309, 

 Carboniferous. 



humilis, see Isonema humile. 



lsevis, Meek, 1871, Proc. Acad. Nat. Sci., p. 

 76, and Ohio Pal., vol. 1, p. 215, Up. 

 Held. Gr. 



Fig. 688.— Nati- 

 copsis Isevis. 



littonana var. genevievensis, Meek & 

 Worthen, 1866, Proc. Acad. Nat Sci., 

 p. 268, Kaskaskia Gr. 



m a d i s onensis, Worthen, 



1884, Bull. No. 2, 111. St, 



Mus. Nat. Hist., p. 9, 



and Geo. Sur. 111., vol. 



8, p. 144, St. Louis Gr. 



magister, syn. for N. ventri- 

 cosa. 



monilifera, White, 1880, 



12th Rep. U. S. Geo. Sur. Terr., p. 168, 

 Up. Coal Meas. 



nana, Meek & Worthen, 1860, (Platystoma 

 nana,) Proc. Acad. Nat. Sci., p. 463, and 

 Geo. Sur. 111., vol. 2, p. 365, Up. Coal 

 Meas. 



nodosa, see Trachydomia nodosa. 



ortoni, Whitfield, 1882, Ann. N. Y. Acad. 

 Sci., vol. 2, p. 230, Coal Meas. 



pricii, Shumard, 1858, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 202, Up. Coal 

 Meas. 



remex, White, 1876, Geo. Uinta Mount- 

 ains, p. 109, and Cont. to Pal., No. 6, 

 p. 139, Low. Aubrey Gr. 



shumardi, McChesney, 1860, (Natica shu- 

 mardi,) Desc. New. Pal. Foss., p. 62, 

 Coal Meas. 



subovata, Worthen, 1873, Geo. Sur. 111., 

 vol. 5, p. 595, Coal Meas. 



ventricosa, Norwood & Pratten, 1854, 

 (Natica ventricosa,) Jour. Acad. Nat, 

 Sci., 2d ser., vol. 3, p. 76, Coal Meas. 



wheeleri, Swallow, 1860, (Littorina wheel- 

 eri,) Trans. St. Louis Acad. Sci., vol. 1, 

 p. 658, and Geo. Sur. 111., vol. 5, p. 595, 

 Coal Meas. 



ziczac, Whitfield, 1882, Ann. N. Y. Acad. 

 Sci., vol. 2, p. 223, Kaskaskia Gr. 

 Omphalotrochus, Meek, 1864, Geo. Califor- 

 nia, vol. 1, p. 15. [Ety. omphalus, um- 

 bilicus ; Trochus, a genus.] Distin- 

 guished from Euomphalus by having a 

 more prominent spire, in having its 

 whorls flattened or broadly concave 

 around the outer side, and flattened, with 

 an outward slope ; it is a more ponderous 

 shell, with a more oblique outline to 

 its lip, in consequence of which it pro- 

 jects much farther forward on the 

 upper than on the lower side of the 

 aperture. Type O. whitneyi. 



whitneyi, Meek, 1864, Pal. of California, 

 vol. 1, p. 15, Carboniferous. 

 Ophileta, Vanuxem, 1842, Geo. Rep. N. Y., 

 p. 36. [Ety. ophis, snake.] Discoidal 

 spire sunk above ; umbilicus perfectly 

 open, exposing the whorls on one 

 plane ; whorls slender, numerous, 

 truncate, and biangular exteriorly ; 

 aperture having a sinus below and a 

 notch above. Type O. complanata. 



abdita, Billings, 1865, Pal. Foss., vol. 1, p. 

 189, Quebec Gr. 



(?) bella, Billings, 1865, Pal. Foss., vol. 1, 

 p. 310, Quebec Gr. 



compacta, Salter, 1859, Can. Org. Rem., 

 Decade 1, p. 16, syn. for O. complanata. 



