266 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Conchidium occidentale Hall. 



Pentamerus occidentalis Hall, Pal. New York, 2, 1852, p. 341, pi. 79, figs. 1, 2. 



Billings, Geol. Canada, 1863, p. 337, fig. 341. Nicholson, Pal. Prov. Ontario, 



1875, p. 67, fig. 35. Whitfield, Geol. Wisconsin, 4, 1882, p. 314, pi. 17, fig. 10; 



pi. 23, figs. 1, 2. Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 239. 

 Conchidium(?) occidentalis Hall and Clarke, ibid., 1895, pi. 67, figs. 1-5. Lesley, 



Geol. Surv. Pennsylvania., Rep. P 4, 1889, p. 618, fig. Grabau and Shimer, 



N. A. Index Fossils, 1, 1907, p. 273, fig. 331. 

 Niagaran (Guelph): Gault and Guelph, Ontario; Point St. Vital, Lake Huron; 



Williamstown, Wisconsin. 



Conchidium scoparium Hall and Clarke. 



Conchidium scoparium Hall and Clarke, Pal. New York, 8, pt. 2, 1895, pi. 67, 

 figs. 6, 7; 48th Rep. New York State Mus. for 1895, 2, 1897, p. 366, pi. 11, 

 figs. 8, 9; 14th Rep. State Geol. New York for 1894, 1897, p. 366, pi. 11, figs. 

 8,9. 



Niagaran (Guelph): Durham, Ontario. 



Conchidium tenulcostatum (Hall and Whitfield). 



Pentamerus nysius var. tenuicosta Hall and Whitfield, 24th Rep. New York 



State Cab. Nat. Hist., 1872, p. 184; 27th Rep., 1875, pi. 10, figs. 1-3. 

 Pentamerus complanatus Nettelroth, Kentucky Fossil Shells, Mem. Kentucky 



Geol. Survey, 1889, p. 53, pi. 27, figs. 14-16. 

 Conchidium tenuicostatus Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 235. 



pi. 64, figs. 3-5. Schuchert, Bull. U. S. Geol. Surv., 87, 1897, p. 187. 

 Niagaran (Louisville): Louisville, Kentucky. 

 Pksiotypes. Cat. No. 51353, U.S.N.M. (Nettelroth's types of P. complanatus). 



Conchidium trilobatum Kindle and Breger. 



Conchidium trilobatum Kindle and Breger, 28th Ann. Rep. Dep. Geol. Nat. Res. 



Indiana, 1904, p. 436, pi. 5, figs. 1-3. 

 Niagaran: Huntington, Indiana. 

 Cotypes.Cat. No. 52933, U.S.N.M. 



Conchidium unguiforme (Ulrich). 



Gypidia unguif ormis Ulrich, Contrib. Amer. Pal., 1886, p. 28, pi. 3, fig. 2. 



Gypidula unguiformis Miller, N. A. Geol. Pal., 1889, p. 346. 



Conchidium unguiformis Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 235, 



pi. 66, figs. 1-4. Kindle and Breger, 28th Ann. Rep. Dep. Geol. Nat. Res. 



Indiana, 1904, p. 436, pi. 6, figs. 4, 5. 

 Niagaran: Louisville, Kentucky (Louisville); Carroll County, Indiana. 



CONCHITA RHOMBOIDALIS Wilckens. See Leptsena rhomboidalis. 



CONCHOPELTIS Walcott. Genotype: C. alternata Walcott. 



Conchopeltis W T alcott, 28th Rep. New York State Mus. Nat. Hist., doc. ed., 



1875, p. 93; mus. ed., 1879, p. 93. Miller, N. A. Geol. Pal., 1889, p. 400. 



Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 823. Berkey, Amer. 



Geol., 21, 1898, p. 278. 



Conchopeltis alternata Walcott. 



Conchopeltis alternata Walcott, 28th Rep. New York State Mus. Nat. Hist., doc. 



ed., 1875, p. 93; mus. ed., 1879, p. 93. Ulrich and Scofield, Geol. Minnesota, 



3, pt. 2, 1897, p. 823, fig. 2. 

 Trenton: Trenton Falls, New York. 



CONCHOPELTIS COMPRESSA Miller. See Scenella compressa. 



