STR. SUB.] 



GASTEROPODA. 



427 



planorbiformis,) Trans. Alb. Inst., vol 

 4, p. 20, and Bull. Am. Mus. Nat. Hist, 

 p. 70, Warsaw Gr. 



spirorbis, Hall, 1859, (Euomphalus spiror 



bis,) 13th Rep. N. Y. Mus. Nat. Hist., 



p. 109, Kinderhook Gr. 



subplaaus, Hall, 1852, (Euompbalus sub- 



planus,) Stans. Ex. to Gt. Salt Lake, 



p. 414, Coal Meas. 



subquadratus, see Euomphalus subquad- 



ratus. 



subrugosus, see Euomphalus subrugosus. 

 subuuibilicatus, Worthen, (in press) 

 Geo. Sur. 111., vol. 8. p. 142, Kaskas- 

 kia Gr. 



umbilicatus, Meek & Worthen, 1860, (Eu- 

 omphalus umbilicatus,) Proc. Acad. 

 Nat. Sci. Phil., p. 462, and Geo. Sur. 111., 

 vol. 2, p. 362, Coal Meas. 

 utahensis, Hall & Whitfield, 1877, U. S. 

 Geo. Expl., 40th parallel, vol. 4, p. 259, 

 Waverly Gr. 



valvatiformis, Shumard, 1863, Trans. St. 

 Louis Acad. Sci., vol. 2, p. 105, Calcifer- 

 ous Gr. 

 varsoviensis, Worthen (in press) Geo. 



Sur. 111., vol. 8, p. 142, Keokuk Gr. 

 whitneyi, see Omphalotrochus whitneyi. 

 STREPTAXIS, Gray, 1837, Mag. Nat. Hist., p. 

 484, [Ety. streptos, twisted; axis, axis.] 

 Shell ovate or oblong ; when young, sub- 

 hemispherical, deeply umbilicated, with 

 rapidly enlarging whorls ; at length the 

 penultimate whorl is bent toward the 

 right and dorsal side of the axis and the 

 umbilicules become compressed and 

 often nearly closed; the mouth lunate; 

 the edge slightly thickened and re- 

 flexed, and often with a single tooth on 

 the outer side of the inner or hinder 

 lip. Type S. comboides. Not a Palae- 

 ozoic genus. 



whitfleldi, Meek, 1871, Proc. Acad. Nat. 

 Sci. Phil., p. 173, and Geo. Sur. 111., vol. 

 5, p. 596, Coal Meas. 



STROPHITKS, Dawson, 1880, Am. Jour. Sci. 

 and Arts, 3d ser., vol. 20, p. 413. [Ety. 

 from the genus Strophia.~] Shell re- 

 sembling the modern Strophia, conical; 

 apex obtuse ; whorls four or more ; 

 surface covered with sharp vertical 

 ridges, separated by spaces three times 

 as wide. Type S. grandsevus. 

 grandsevus, Dawson, 1880, Am. Jour. Sci. 

 and Arts, 3d ser., vol. 20, p. 413, De- 

 vonian. 



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

 3, p. 303. [Ety. strophe, turning round ; 

 stylos, column.] Subglobose or ovoid 

 globose; spire small with a large ven- 

 tricose body whorl; outer lip thin, not 

 reflected ; columella twisted or spirally 

 grooved within, not reflected; no um- 

 bilicus; aperture somewhat round, 

 ovate or transversely broad oval. Type 

 S. elegans. 



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

 p. 472, Oriskany sandstone. 



cancellatus, Meek & Worthen, 1868, Geo. 

 Sur. 111., vol. 3, p. 404, Oriskany sand- 

 stone. 



I'IG. 716. Strophostylus cancellatus. B, Surface 

 markings enlarged. 



cyclostomus, Hall, 1863, Trans. Alb. Inst., 



vol. 4, p. 218, Niagara Gr. 

 cyclostomus var. disjunctus. Hall, 1879, 



28th Rep. N. Y. Mus. Nat. Hist., p. 177, 



Niagara Gr. 

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



p. 306, Low. Held. Gr. 

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



304, Low. Held. Gr. 



expansus, Conrad, 1841, (Platyceras ex- 

 pansum,) Ann. Rep. N. Y , p. 55, and 

 Pal. N. Y., vol. 3, p. 470. Oriskany sand- 

 stone. 



fitchi, Hall, 1859, Pal. N. Y., vol. 3, p. 306, 

 Low. Held. Gr. 



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



305, Low. Held. Gr. 



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



471, Oriskany sandstone, 

 obliquus, Nicholson, 1874, Rep. Pal. Ont., 



p. 119, Up. Held. Gr. 

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



305, Low. Held. Gr. 

 ovatus, Nicholson, 1874, Rep. Pal. Ont, 



p. 118, Up. Held. Gr. 

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



p. 307, Low. Held. Gr. 

 subglobosus, Nicholson, 1874, Rep. Pal. 



Ont., p. 118, Up. Held. Gr. 

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



p. 470, Oriskany sandstone, 

 unicus, Hall, 1862, 15th Rep. N. Y. Mus. 



Nat. Hist, p. 41, and Pal. N. Y., vol. 5, 



pt 2, p. 30, Schoharie grit, 

 varians, Hall, 1876, Illust Devonian 



Foss., pi. 11, and Pal. N. Y., vol. 5, pt. 



2, p. 31, Up. Held. Gr. 

 Stylifer, Broderip, 1829, in Sowerby, Gen. 



Shells. 



primigenia, see Macrochilina primigenia. 

 SUBULITES, Conrad, 1847, Pal. N. Y., vol. 1, 



p. 182. [Ety. subula, an awl.] Sub- 

 ulate, volutions wide, suture oblique; 



aperture very elongate, narrow, pointed 



above, but wider below. Type S. elon- 



gatus. 

 abbreviate, Hall, 1850, 3d Rep. N. Y. 



Mus. Nat, Hist., p. 180, Trenton Gr. 

 brevis, Winchell & Marcy, 1865, Mem. 



Bost. Soc. Nat. Hist., vol. 1, p. 100, Ni- 

 agara Gr. 

 calciferus, Billings, 1859, Can. Nat. & Geo., 



vol. 4, p. 360, Calciferous Gr. 



