1012 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Pleurotoharia immatura Billings. See Raphistoma immaturum. 



Pleurotomaria indenta Hall. 



Pleurotomaria indenta Hall, Pal. New York, 1, 1847, p. 176, pi. 38, fig. 2 — 

 Emmons, Amer. Geology, 1, pt. 2, 1855, p. 161, pi. 5, fig. 5; pi. 17, fig. 8. — 

 Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 710, fig. 



Trenton: Watertown, New York. 



Pleurotomaria inexpectans Hall and Whitfield. 



Pleurotomaria inexpectans Hall and Whitfield, Geol. Surv. Ohio Pal., 2, 1875, 

 p. 117, pi. 5, fig. 12.— Foerste, Bull. Sci. Lab. Denison Univ., 1, 1885, p. 96; 

 Geol. Surv. Ohio Pal., 7, 1893, p. 549. 

 Upper Medinan (Brassfield): Todds Fork, Clinton County, Ohio. 



Pleurotomaria labrosa var. occidens Hall. See Phanerotrema occidens. 



Pleurotomaria Laphami Whitfield. See Eotomaria laphami. 



Pleurotomaria laurentina Billings. See Raphistomina laurentina. 



Pleurotomaria lenticularis of American authors. See Liospira americana and 

 L. vitruvia. 



Pleiuotomaria lenticularis of authors (not Sowerby). 



Pleurotomaria lenticularis Emmons (Conrad MS., not Sowerby), Nat. Hist. New 

 York, Geol., 2, 1842, p. 392, fig. 2; p. 393, figs. 2, 3— Owen, Geol. Expl. Iowa, 

 Wisconsin, Illinois, 2d ed., 1844, p. 86, pi. 18, fig. 6; Amer. Jour. Sci. Arts, 47, 

 1844, p. 365, fig. 2.— Hall, Pal. New York, 1, 1847, p. 172, pi. 37, figs. 6a-d.— 

 Emmons, Amer. Geology, 1, pt. 2, 1855, p. 160, pi. 6, figs. 13a, b; pi. 17, fig. 

 13a; Man. Geology, 1860, p. 98, fig. 87.— Lincklaen, 14th Rep. New York State 

 Cab. Nat. Hist., 1861, p. 47, pi. 2, fig. 2.— Nicholson, Rep. Pal. Prov. Ontario, 

 2, 1875, p. 19, fig. 7d (loc. occ.).— Koken, Neues Jahrb. Min., Geol., Pal., 6, 

 1889, p. 352. 



Raphistoma lenticularis Hall, Rep. Geol. Surv. Wisconsin, 1862, p. 39, fig. 4. — 

 Meek and Worthen, Geol. Surv. Illinois, 3, 1868, p. 316, pi. 3, fig. 7b (a, c?).— 

 Miller, Cincinnati Quart. Jour. Sci., 1, 1874, p. 319.— Whitfield, Geol. Wis- 

 consin, 4, 1882, p. 214, pi. 6, figs. 4, 5. — Chamberlin, Geol. Wisconsin, 1, 

 1883, p. 157.— Lesley, Geol. Surv. Pennsylvania, Rep. P 4, p. 850, figs.— 

 Koken, Neues Jahrb. f. Min., Geol., Pal., 6 Beilage-Band, p. 352.— Miller, 

 N. A. Geol. Pal., p. 424, fig. 708.— Whiteaves, Canadian Rec. Sci., 5, p. 318 — 

 Keyes, Missouri Geol. Surv., 5, 1894, p. 163.— Raymond, Bull. Amer. Pal., 3, 

 1902, p. 306, pi. 19, figs. 7, 8. 



Trochus lenticularis? Owen, Geol. Expl. Iowa, Wisconsin, Illinois, 2d ed., 1844, 

 p. 80, pi. 15, fig. 5. 



Middle and Upper Ordovician: United States and Canada. 



Observation. — So many distinct species now impossible to determine without 



an examination of the figured specimens have been described as Pleurotomaria 



or Raphistoma lenticularis that it is believed useless to try to assign the 



references to their proper place. 



Pleurotomaria litorea Hall. 



Pleurotomaria litorea Hall, Pal. New York, 2, 1852, p. 12, pi. 4 bis, figs. 4a, b — 

 Grabau, Bull. New York State Mus., 45, 1901, p. 212, fig. 142; Bull. Buffalo 

 Soc. Nat. Sci., 7, 1901, p. 212, fig. 142. 

 Upper Medinan: Lockport, New York. 



