CATALOGUE OF TRILOBITES. 321 



LONCHOCEPHALUS. 



Loganelliis Devine, 1863; Canadian Naturalist, vol. S, p. 93. (See Plif- 

 choparia, Crepicephalus and Olenus.) 



logani Deviue, 1863; Canadian Naturalist, vol. 8, y). 9o. See PUjrho- 



paria logani.) Point Levis, Quebec. 



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



quebecensis Bill., 1865; Pal. Foss., vol. 1, p. 203. (See Plj/choparia 



logani.) 

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

 Minnesota, p. 576. Dr. Ov/en in his report, Geol. Sui-vey, Wis., 

 Iowa and Minnesota, described four new genera of trilobites under 

 the names of Dikelocephalus, Lonchocephaliis, Crepicephalus and 

 Menocephalus. The second genus is now classed as a synonym 

 to Aiiomocare with Anomocare cMppeiuannis, 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 Lonchocephaliis 

 (?) 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 PUjchoparia, 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 Lonchoceiihalus on p. 624 of his report. Under the 

 law of priority the genus Pi^/cAopar/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 

 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 (?) ioioensis. 



sp.? Owen, 1852; TXe]}. 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 Eange, Nevada. Taconic. 



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

 p. 655, pi. 96, tigs. 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. Eeconnoissauce 

 Chip2>ewa Land Dist., p. 14, pi. 7, fig. 1. Taconic. 



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

 vol. 2, p. 102. 

 21 



