1016 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



PLEUROTROCHUS Grabau. Genotype: P. tricarinatus Grabau. 



Pleurotrochus Grabau, Michigan Geol. Surv., Geol. Ser., 1, 1909, p. 179. 



Pleurotrochus tricarinatus. Grabau. 



Pleurotrocb.ua tricarinatus Grabau, Michigan Geol. Surv., Geol. Ser., 1, 1909, 



p. 180, pi. 27, figs. I', 2; pi. 1G, fig. 5. 

 Upper Monroan (Lucas): Salt shaft, Detroit, Michigan. 



Pliomera Raymond (not Angelin). See Pliomerops Raymond. 



Pliomera canadensis Grabau and Shinier. See Pliomerops canadensis. 



PLIOMEROPS Raymond. Genotype: Amphion canadensis Billings. 



Pliomera Raymond (not Angelin), Amer. Jour. Sci., 4th ser., 19, 1905, p. 377. — 



Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 321. 

 Pliomerops Raymond, Amer. Jour. Sci., 4th ser., 19, 1905, p. 378; Zittel-Eastman 



Textb. Pal., 1913, p. 725. 



Pliomerops barrandei (Billings). 



Amphion Barrandei Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 288, 



fig. 277, a, b. 

 Pliomerops barrandei Raymond, Ann. Carnegie Mus., 7, 1910, p. 76, fig. 7. 

 Chazyan (Quebec— I, K, N, P): Point Rich, Table Head, Bonne Bay, etc., 



Newfoundland. 



Pliomerops canadensis (Billings). 



Amphion Canadensis Billings, Canadian Nat. Geol., 4, 1859, p. 381, fig. 12; Geol. 



Canada, Geol. Surv. Canada, 1863, p. 133, fig. 69; Pal. Foss., 1, Geol. Surv. 



Canada, 1865, p. 288, fig. 278.— Miller, N. A. Geol. Pal., 1889, p. 527, fig. 



956.— Raymond, Ann. Carnegie Mus., 3, 1905, p. 363, pi. 14, figs. 10-13. 

 Cf. Calymene multicosta Hall, Pal. New York, 1, 1847, p. 228, pi. 60, fig. 3. 

 Pliomera canadensis Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 321, fig. 



1634a-c. 

 Pliomerops canadensis Raymond, Amer. Jour. Sci., 19, 1905, p. 378 (gen. ref.); 



Ann. Carnegie Mus., 7, 1910, p. 75, pi. 18, fig. 14, figs. 4-6; 7th Rep. Vermont 



State Geol., 1910, p. 238, pi. 36, figs. 10-13; pi. 38, fig. 14.— Perkins, Rep. 



Vermont State Geol., 8th ser., 1912, pi. 18, fig. 14. 

 Chazyan: Mingan Islands (Mingan) and Montreal, Canada; Valcour Island, 



Chazy, etc., New York; Isle La Motte, Vermont. 



Pliomerops? convexus (Billings). 



Amphion convexus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 322. 

 Canadian (Beekmantown): Stanb ridge, Quebec. 



Pliomerops? insularis (Billings). 



Amphion insularis Billings, Pal. Foss., 1, Geol. Surv. Canada, 1S65, p. 290. 

 Canadian (Quebec — G): Port aux Choix, Newfoundland. 



Pliomerops? jnlius (Billings). 



Amphion Julius Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 290, fig. 279. 

 Chazyan (Quebec — P): Cow Head, Newfoundland. 



Pliomerops? nevadensis (Walcott). 



Amphion Nevadensis Walcott, Mon. U. S. Geol. Surv., 8, 18S4, p. 94, pi. 12, fig. 13. 

 Upper Pogonip: Eureka and White Pine Districts, Nevada. 

 Cotypes.— Cat. No. 24645, U.S.N.M. 



