TRY. — TUR.] 



GASTEROPODA. 



429 



nana, Foerste, 1885, Bull. Sci. Lab. Denison 



Univ., p. 94. Not properly defined. 

 pauper, Hall, ayn. for P. halii. 

 pauper var. ohioense, Hall & Whitfield, 

 1875, Ohio Pal., vol. 2, p. 144, XiagaraGr. 

 rectilatera, Hall & Whitfield, 1872, 24th 

 Rep. N. Y. Mus. Nat. Hist., p. 193, Up. 

 Held. Gr. 

 tricarinatum, Billings, 1859, Can. Nat. & 



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

 tricarinnta, see Troehonema meekanum. 

 umbilicatum, Hall, 

 1847, (Pleuroto- 

 maria umbilica- 

 ta,)Pal. N.Y.,vol. 

 1, p. 43. Chazy to 

 Hud. Riv. Gr. 

 yandellanum, Hall 

 ct Whitfield, 1872, 

 24th Rep. N. Y. 

 Mus. Nat. Hist., 

 p. 194, Up. Held. 



Fig. 719— Troehonema _ ™ r - , . 



umbilicatum. Trochus, Adanson, 



1757, Voy. Sene- 

 gal. [Ety. trochus, a hoop.] Not a 

 Palaeozoic genus. 



huronensis, Castelnau, 1843, Syst. 811., p. 

 35. Not recognized. 



missouriensis, see Pleurotomaria missouri- 

 ensis. 

 Tryblidium, Lindstrom, 1880, Fragmenta 

 Silurica, p. 15. [Ety. trublion, a cup.] 

 Patelliform, obovate, acuminate ante- 

 riorly, enlarged posteriorly ; muscular 

 scars in six disconnected pairs arranged 

 in an oblong circle open toward the 

 front. Type T. reticulatum. 



acutum, Whitfield, 1889, Bull. Am. Mus. 

 Nat. Hist., vol. 2, p. 45, Calciferous Gr. 



canadense, Whiteaves, 1884, Pal. Foss., 

 vol. 3, p. 31, Guelph Gr. 



conicum, Whitfield, 1886, Bull. Am. Mus. 

 Nat. Hist., vol. 1, p. 306, Birdseye Gr. 



erato, Billings, 1862, (Metoptoma erato,) 

 Pal. Foss., vol. 1, p. 39, Black Riv. Gr. 



eubule, Billings, 1862, (Metoptoma eu- 

 bule,) Pal. Foss., vol. 1, p. 38, Calcifer- 

 ous and Black Riv. Gr. 



Fig. 720— Tryblidium nycteis. 



hyrie, Billings, 1862, (Metoptoma hyrie,) 

 Pal. Foss., vol. 1, p. 87, Quebec Gr. 



niobe, Billings, 1862, (Metoptoma niobe,) 

 Pal. Foss., vol. 1, p. 37, Calciferous Gr. 



nycteis, Billings, 1862, (Metoptoma nycteis, 

 Pal. Foss., vol.1, p. 38, Calciferous Gr. 



Fig. 721. 



-Turbo marmo- 

 ratus. 



ovale, Whitfield, 1886, Bull. Am. Mus. 



Nat. Hist., vol. 1, p. 305, Birdseye Gr. 

 ovatum, Whitfield, 1886, Bull. Am. Mus. 



Nat, Hist,, vol. 1, p. 305, Birdseye Gr. 

 pileolum, Whitfield, 1889, Bull. Am. Mus. 

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

 simplex, Billings, 1865, (Metoptoma sim- 

 plex,) Pal. Foss., vol. 1, p. 346, Calcifer- 

 ous Gr. 

 Turbo, Klein, 1753, Tent. Meth. Ostr. [Ety. 

 turbo, top.] Shell thick, ovate ; body 

 whorl rounded, ventricose ; spire small, 

 of several convex whorls, pointed ; sur- 

 face spirally grooved or nodulated ; 

 aperture large, nearly circular, slightly 

 produced and 

 broadly 

 rounded in 

 front, more 

 or less mod- 

 ified by the 

 p receding 

 whorl ; outer 

 and inner 

 lips thin ; op- 

 e r c u 1 u m 

 thick, shelly, 

 rugged with- 

 out, flattened 

 and spirally 

 sulcated 

 within. Type T. marmoratus. Not an 

 American Palaeozoic genus. The spe- 

 cies left here is, for want of material, 

 to refer them where they belong. 

 bicarinatus, Troost, 1840. Not defined. 

 dilucula, see Holopea dilucula. 

 guadalupensis, Shumard, 1859, Trans St, 

 Louis Acad. Sci., vol. 1, p. 398, Per- 

 mian Gr. 

 huronensis, Castelnau, 1843. Not recog- 

 nized. 

 lineatm, see Pleurotomaria lineata. 

 obesus, Shumard, 1858, Trans. St. Louis 

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

 Meas. 

 (?) obscura, see Holopea 



obscura. 

 shumardi, see Platys- 



toma shumardi. 

 tabulata, see Pleuroto- 

 maria tabulata. 

 tennesseensis, see Cyclo- 



nema tennesseense. 

 t e x a n u s, Shumard, 

 1859, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 

 400, Coal Meas. 

 Turbonilla, Leach, 1826, 

 Risso Eur. Merid. 

 4. [Ety.di minutive 

 of l'urbo, a genus.] 

 Not a Palsezoic 

 genus. Fig. 722— Turritella 



SWallovana, see Aclis- imbricata, 



ina swallovana. 

 Tukritella, Lamarck, 1801, Syst. An. sans 

 Vert., p. 89. Not a Palaeozoic genus. 

 Type T. imbricata. 



