QATALOGUE OP TRIL0J5ITE.S . 321 



LONCHOCEPHALUS. 



Loganellus Devine, 1863; Cauadiau Naturalist, vol. 8, j). 93. (See /'ti/- 

 choparia, Crepicephnlus and Olenus.) 



lof/ani Deviue, 1863; Canadian Naturalist, vol. 8, p. 95. See Plycho- 



j)aria loijnni.) Point Levis, Quebec. 

 Olenusi lorjani Bill., 1865; Pal. Foss., vol. 1, p. 201, figs. 185, 186. 



quehecensh Bill., 1865; Pal. Foss., vol. 1, p. 203. (See Ptychoparkc 



logunl.) 



LONCHOCEPHALUS Owen, 1852; Rep. 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 Dikelocephaliis, Lonchocephalus, Crepicephalus and 

 Menocephaliis. The second genus is now classed as a synonym 

 to Ano7nocare 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, jjlaces the latter 

 species imder a subgenus to Ptychoparia, using Dr. Owen's Crept- 

 rephalus for it on account of the peculiar iiygidium, 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 /•<«/(• Aopar/a 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 

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

 care for hamulus and chippeivcensis, and Lonchocephalus for the 

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

 spines which includes Dikelocephaliis (?) ioivensis. 



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



p. 624. 



Crepicephalus axgusta Wal., 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 Range, Nevada. Taconic. 



Crepicephalus angusta Wal., 1890; 10th Rep. U. S. Geol. Survey, 



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

 Dicellocephalus? iowensis Owen, 1852; Rep. Geol. Wisconsin, Iowa 

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

 and near the moTith of Black River. 

 Undetermined Trilobite, Owen, 1848; Rep. Geol. Reconnoissance 

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



Conocephalites iowensis Shuni., 1863; Trans. Acad. Sci. St. Louis, 

 vol. 2, p. 102. 

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