CATALOGUE OF TRILOBITES. 321 



LONCHOCEPHALUS. 



Loganellus Devine, 1863; Canadian Naturalist, vol. 8, p. 93. (See Pty- 

 choparia, Crepicephalus and Olenus.) 



logani Deviue, 1863; Canadian Naturalist, vol. 8, p. 95. See Ptycho- 



paria logani.) Point Levis, Quebec. 

 Olenus? logani Bill., 1865; Pal. Foss., vol. 1, p. 201, figs. 185, 186. 



quebecensis Bill., 1865; Pal. Foss., vol. 1, p. 203. (See Ptychoparia 



logani.) 



LONCHOCEPHALUS Owen, 1852; Eep. Geol. Survey Wisconsin, Iowa, and 

 Minnesota, p. 576. Dr. Owen in his report, Geol. Survey, Wis., 

 Iowa and Minnesota, described four new genera of trilobites under 

 the names of Dikelocephalus, Lonchocephalus, Crepicephalus and 

 Menocephalus. The second genus is now classed as a synonym 

 to Anomocare with Anomocare chippeivcensis, and A. hamulus, de- 

 scribed in the report. There is a third species mentioned by Owen 

 on p. 624, and also plate 1 a, fig. 15, Pygidium of Lonchocephalus 

 (?) with long, slender, divergent caudal spines; also a similar 

 pygidium, figured plate 1 a, fig. 13, as Dikelocephalus (?) iowensis. 

 Walcott, Bull. U. S. Geol, Survey, N. 10, p. 36, 'places the latter 

 species under a subgenus to Ptychoparia, using Dr. Owen's Crepi- 

 cephalus for it on account of the peculiar pygidium, overlooking, 

 however, the fact that Owen has referred a similar pygidium directly 

 to his genus Lonchocephalus on p. 624 of his report. Under the 

 law of priority the genus Ptychoparia replaces Crepicephalus, and 

 the later name should be cancelled in toto, and not be retained in 

 a modified sense. Lonchocephalus forms an exception to this 

 rule, if we divide the genus into two sections, retaining Anomo- 

 care for hamulus and chippewcensis, and Lonchocephalus for the 

 species described by Dr. Owen with long, slender, divergent caudal 

 spines which includes Dikelocephalus ( ?) ioicensis. 



sp.? Owen, 1852; Rep. Geol. Survey, Wisconsin, Iowa and Minnesota, 



p. 624. 

 CREPICEPHALUS ANGUSTA Wai., 1886; Bull. U. S. Geol. Survey, No. 



30, p. 208, pi. 28. figs. 2, 2 a, b. Pioche, also 11 miles north of 



Bennet's Springs, Highland Eange, Nevada. Taconic. 



CREPICEPHALUS ANGUSTA Wai., 1890; 10th Eep. U. S. Geol. Survey, 



p. 655, pi. 96, figs. 9, 9 a, b. 

 Dicellocephalus? IOWENSIS Owen, 1852; Eep. Geol. Wisconsin, Iowa 



and Minnesota, p. 575, pi. 1, fig. 4; pi. 1 a, fig. 13. Mountain Island 



and near the mouth of Black Eiver. 

 Undetermined Trilobite, Owen, 1848; Eep. Geol. Eeconnoissance 



Chippewa Land Dist., p. 14, pi. 7, fig. 1. Taconic. 



Conocephaliles IOWENSIS Shum., 1863; Trans. Acad. Sci. St. Louis, 



vol. 2, p. 102. 

 21 



