EOT. EUO.] 



GASTEROPODA. 



403 



tapering, widely disconnected whorls; 

 upper surface usually flattened in one 

 plane, or slightly elevated ; lower sur- 

 face of whorls round ; no chambers. 

 Type E. bucklandi. 



atlanticus, Billings, 1865, Pal. Foss., vol. 

 1, p. 250, Quebec Gr. 



canadensis, Billings, 1861, Can. Nat. and 

 GeoL, vol. 6, p. 320, Quebec Gr. 



circinatus, Whiteaves, 1884, Pal. Foss., 

 vol. 3, p. 35, Guelph Gr. 



comes, Hall, 1876, Illust. Devon. Foss., 

 pi. 16, Ham. Gr. 



devonicus, Walcott, 1885, Monogr. IT. S. 

 Geo. Sur., vol. 8, p. 187, Devonian. 



FIG. 672. Eccyiioiuplmlus distans. 



distans, Billings, 1865, Pal. Foss., vol. 1, 



p. 249, Quebec Gr. 

 eboracensis, Hall, 1861, (Euomphalus 



eboraceusis,) 15th Rep. N. Y. Mus. Nat. 



Hist., p. 55, and Pal. N. Y., vol. 5, pt. 



2, p. 61, Ham. Gr. 

 gyroceras, Roemer, 1852, (Euomphalus 



gyroceras,) Kreid. von Texas, p. 91, 



Silurian, 

 intortus, Billings, 1861, Can. Nat. and 



GeoL, vol. 6, p. 321, Quebec Gr. 

 laxus, Hall, 1861, (Euomphalus laxus,) 



15th Rep. N. Y. Mus. Nat. Hist., p. 54, 



and Pal. N. Y., vol. 5, pt. 2, p. 60, Up. 



Held. Gr. 

 paradoxus, Winchell, 1863, (Phanerotinus 



paradoxus,) Proc. Acad. Nat. Sci., p. 21, 



and Pal. N. Y., vol. 5, pt. 2, p. 60, Mar- 

 shall Gr. 

 priscus, Whitfield, 1889, Bull. Am. Mus. 



Nat. Hist., vol. 2, p. 46, Calciferous Gr. 

 spiralis, Billings, 1861, Can. Nat. and 



Geol., vol. 6, p. 321, Quebec Gr. 

 superbus, Billings, 1865, Pal. Foss., vol. 



1, p. 250, Quebec Gr. 

 undulatus, Hall, 1861, Geo. Rep. Wis., p, 



37, Trenton Gr. 

 volutatus, Whitfield, 1886, Bull. Am. Mus. 



Nat. Hist., vol. 1, p. 314, Birdseye Gr. 

 EOTROCHUS, Whitfield, 1882, Bull. Am. Mus. 



Nat. Hist., p. 77. [Ety. eos, dawn ; 



Trochus, a genus.] Conical above, flat 

 or concave beneath, and broadly and 

 deeply umbilicated ; aperture very ob- 

 lique, and the outer angle of volutions 

 strongly carinated; surface ornamenta- 

 tion unlike on the upper and lower 

 parts. Type E. concavus. 

 concavus, Hall, 1858, 

 (Pleurotomaria con- 

 cava,) Trans. Alb. 

 Inst., vol. 4, p. 24, 

 and Bull. Am. Mus. 

 Nat. Hist., p. 78, 



FIG. 674. Eunema 

 cerithioides. 



1826, His- 



toire Naturelle des 

 Principales, p. 123. Not an American 

 Palaeozoic genus. 



peracuta, see Polyphemopsis peracuta. 

 EUNEMA, Salter, 1859, Can. Org. Rem., Dec- 

 ade 1 , p. 24. [Ety. eu, beautiful ; nema, 

 line.] Turbinate, thin ; few angular 

 whorls, strong concentric ridges, crossed 

 by sinuate or oblique lines of growth ; 

 inner lip not reflected ; peritreme 

 simple; mouth rather effuse below; 

 no umbilicus. Type E. strigillatum. 



cerithioides, Salter,1859, 

 Can. Org. Rem., Dec- 

 ade 1, p. 30, Black 

 Riv. Gr. 



erigone, Billings, 1862, 

 Pal. Foss., vol. 1, p. 

 35, Black Riv. Gr. 

 pagoda, Salter, 1859, 

 Can. Org. Rem., Dec- 

 ade 1, p. 30, Black 

 Riv. Gr. 

 priscum, Billings, 1859, Can. Nat. and 



Geo. vol. 4, p. 360, Calciferous Gr. 

 salteri, see Orthonema salteri. 

 strigillatum, Salter, 1859, Can. Org. Rem., 



Decade 1, p. 29, Black Riv. Gr. 

 trilineatum, Hall, 186(, 20th Rep. N. Y. 



Mus. Nat. Hist., p. 397, Niagara Gr. 

 EUOMPHALUS, Sowerby, 1812, Min. Conch., 

 vol. 1, p. 97. [Ety. eu, wide; omphalos, 

 umbilicus.] Shell 

 discoid, spire flat- 

 tened; whorls nu- 

 merous, angu- 

 lated; umbilicus 

 very wide, expos- 

 ing volutions; 

 mouth nearly cir- 

 cular ; peritreme 

 entire, not in- 

 dented by the 

 preceding whorl; 

 surface usually KIG. 675. Euomphalus 

 sculptured. Type pentangulatus. 

 E. pentangulatus. 



ammon, White & Whitfield, 1862, Proc. 

 Bost. Soc. Nat. Hist., vol. 8, p. 301, Kin- 

 derhook Gr. 

 boonensis, Swallow, 1863, Trans. St. Louis 



Acad. Sci., vol. 2, p. 99, Burlington Gr. 



calciferus, Whitfield, 1889, Bull. Am. Mus. 



Nat. Hist., vol. 2, p. 47, Calciferous Gr. 



