HEL. HOL.] 



GASTEROPODA. 



405 



terebriformis, 

 N. Y. Mus. 



FIG. 676. Fusispira ventricosa. 



Hall, 1871, 24th Rep. 

 Nat. Hist., p. 230, Hud. 

 Riv. Gr. 



ve n t r i cosa, 

 Hall, 1871, 

 24th Rep. 

 N. Y. Mus. 

 Nat. Hist, 

 p. 229, 

 Trenton 

 Gr. 



vittata, Hall, 

 1847, (Mur- 

 chisonia 

 vittata,) 

 Pal. N. Y., 

 vol. 1, p. 

 181, Tren- 

 ton Gr. 

 Fusus, Bru- 



fu i e r e , 

 789, Eu- 

 cyc. Meth. 

 This ge- 

 nus is un- 

 known in 

 the Palaeo- 

 zoic rocks. 

 inhabilis,syn. 

 for Macrocliilina primigenia. 

 HELICOTOMA, Salter, 1859, Can. Org. Rem., 

 Decade 1, p. 13. [Ety. Helix, genus of 

 shells; tome, notch.] Depressed discoid, 

 spire nearly flat, whorls obtusely an- 



fular externally, rounded below ; um- 

 ilicus broad ; form helicoid. Type H. 



planulata. 

 declivis, Safford, 1869, 



Geo. of Tenn. Not 



denned, 

 eucharis, Billings, 



1865, Pal. Foss., FIG. 677. Helicotoma 



vol. 1, p. 249, Que- eucharis. 



bee Gr. 

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



p. 248, Quebec Gr. 

 larvata, Salter, 1859, Can. Org. Rem., 



Decade 1, p. 15, Black Riv. and Tren- 

 ton Grs. 

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



p. 309, Quebec Gr. 

 muricata, Salter, 1859, (H. planulata var. 



muricata,) Can. Org. Rem., Decade 1, 



p. 14, Black Riv. and Trenton Grs. 

 naresi, Etheridge, 1878, Quar. Jour. Geo. 



Soc., vol. 34, p. 602, Up. Sil. 

 perstriata, Billings, 1859, Can. Nat. and 



Geo., vol. 4, p. 356, Calciferous Gr. 

 planulata, Salter, 1859, Can. Org. Rem., 



Decade 1, p. 14, Black Riv. and Trenton 



Grs. 

 proserpina, Billings, 1865, Pal. Foss., vol. 



1, p. 247, Quebec Gr. 

 serotina, Nicholson, 1874, Rep. Pal. Ont., 



p. 120, Up. Held. Gr. 

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

 ade 1, p. 15, Black Riv. Gr. 

 tennesseensis, Safford, 1869, Geo. of Tenn. 



Not defined. 



27 



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



p. 247, Quebec Gr. 



HOLOPEA, Hall, 1847, Pal. N. Y., vol. 1, p. 

 169. [Ety. holos, entire ; ope, aperture.] 

 Shell conical, ventricose, more or less 

 oblique, or .nearly direct; aperture 

 round, ovate; margin entire; surface 

 marked by fine curved strise or cancel- 

 lated; distinguished from Cyclonema 

 by the presence of an umbilicus. Type 

 H. symmetrica and H. obliqua. 



antiqua, Vanuxem, 1843, (Littorina an- 

 tiqua,) Geo. Rep. 3d Dist. N. Y., p. 112, 

 and Pal. N. Y., vol. 3, p. 294, Low. 

 Held. Gr. 



antiqua var. pervetusta, Hall, 1859, Pal. 

 N. Y., vol. 3, p. 295, Low. Held. Gr. 



cassina, Whitfield, 1886, Bull. Am. Mus. 

 Nat. Hist., p. 310, Birdseye Gr. 



chicagoensis, Winchell & Marcy, 1865, 

 Mem. Bost. Soc. Nat. Hist., p. 99, Niag- 

 ara Gr. 



conica, Winchell, 1863, Proc. Acad. Nat. 

 Sci., p. 21, Marshall Gr. 



danai, Hall, 1859, Pal. N. Y., vol. 3, p. 

 295, Low. Held Gr. 



dilucula, Hall, 1847, (Turbo 

 dilucula,) Pal. N. Y., vol. 

 1, p. 12, Calciferous Gr. 



(?) elongata, Hall, 1859, Pal. 

 N. Y., vol. 3, p. 295, Low. 

 Held. Gr. 



eriensis, Nicholson, 1874, 

 Rep. Pal. Ont., p. 120, Up! 

 Held. Gr. 



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

 159, Guelph Gr. 



guelphensis, Billings, 1862, Pal. Foss., vol. 

 1, p. 159, Guelph Gr. 



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

 p. 158, Guelph Gr. 



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

 28, Trenton Gr. 



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

 p. 187, Quebec Gr. 



magniventra, Whitfield, 1878, Ann. Rep. 

 Geo. Sur. Wis., p. 83, and Geo. Wis., 

 vol. 4, p. 316, Niagara Gr. 



nana, Meek, 1871, Proc. Acad. Nat. Sci., 

 p. 172, syn. for Cyclora minuta. 



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

 27, Trenton and Black Riv. Grs. 



newtonensis, Whitfield, 1882, Ann. N. Y. 

 Acad. Sci., vol. 2, p. 224, Kaskas- 

 kia Gr. 



niagarensis, Winchell & Marcy, 1865, 

 Mem. Bost. Soc. Nat. Hist., p. 99, Niag- 

 ara Gr. 

 obesa, Whitfield, 1882, Geo. Wis., vol. 4, 



p. 348, Low. Magnesian Gr. 

 obliqua, Hall, 1847, Pal. N. Y., vol. 1, p. 



170, Trenton and Hud. Riv. Gr. 

 obseura, Hall, 1847, (Turbo obscura,) Pal. 



N. Y., vol. 1, p. 12, Calciferous Gr. 

 occidentalis, Nicholson, 1875, Quar. Jour. 

 Geo. Soc. Lond., vol. 31, p. 550, 

 Guelph Gr. 



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

 p. 222, Quebec Gr. 



