NO. 5 CAMBRIAN TRILOBITES RESSER 35 



Middle Cambrian, Meagher; (loc. 4g) 5 miles northeast of Logan, 

 Montana. 



Cotypes. — U.S.N.M. nos. 62769-62772. 



Glyphaspis ? montanensis (Whitfield) 



Crcpicephahis (Logaiicllus) montanensis Whitfield, Ludlow's Rep. Recon. 

 Yellowstone Nat. Park, War Dep., p. 141, pi. i, figs, i, 2, 1876. 



Specimen too poor to be sure of generic position. 

 Middle Cambrian, Meagher; near Fort Logan, 18 miles northwest 

 of White Sulphur Springs, -Montana. 

 Holotype.—U.S.NM. no. 90668. 



IDAHOIA WALCOTT, 1924 



Idahoia Walcott, Smithsonian Misc. Coll., vol. 75, no. 2, p. 58, 1924; idem, no. 3, 

 p. 94, 1925. 



Genotype. — /. serapio Walcott. 

 Range. — Middle Upper Cambrian. 



ADDITIONAI. SPECIES REFERRED TO IDAHOIA 



Idahoia wisconsinensis (Hall) 

 Conocephalitcs wisconsinensis Hall, i6th Ann. Rep. New York State Cab. 



Nat. Hist., p. 164, pi. 7, figs. 39, 41 ; pi. 8, figs. 22-24, 27, 28, 1863. 

 Saratogia vtnsconsinensis Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, 



p. 198, pi. 34, figs. 5-Sc, 1916. 



Upper Cambrian, Franconia ; Trempealeau and other localities in 

 Wisconsin. 



Cotypes.— A.U.^.B.. 



Idahoia latifrons (Hall) 



Conocephalitcs latifrons Hall, i6th Ann. Rep. New York State Cab. Nat. 

 Hist., p. 122, pi. 7, fig. 40, 1863. 



This form is a good species. 



Upper Cambrian, Franconia ; Trempealeau, Wisconsin. 



Holotype. — Presumably lost. 



Idahoia hamulus (Owen) 



Lonchocephalus hamulus Owen, Rep. Geol. Surv. Wisconsin, Iowa, Minne- 

 sota, p. 576, pi. lA, figs. 8, 12, 1852. 



Conocephalitcs hamulus Hall, i6th Ann. Rep. New York State Cab. Nat. 

 Hist., p. 166, pi. 7, figs. 43, 44; pi. 8, figs. 25, 26, 1863. 



Saratogia hamulus Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 196, 

 1916. 



Upper Cambrian, Franconia ; Minneiska, Minnesota ; Trempealeau 

 and other localities in Wisconsin. 



Cotypes. — Original types destroyed ; plesiotypes, A.M.N.H. no. 315. 



