CATALOGUE OF TRILOBITES. 263 



AGNOSTUS. 



Series B (FALLACES). This series has a smaller head, and moderately 

 broad limb. Cheeks large; basal lobes rather large with a broad 

 posterior lobe to the axis of the pygidium. Type Agnostus fallax 

 Linrs . 



Sec. IV. LJEVIGATI. The dorsal grooves marking the glabella and 

 axis of the thorax and pygidium are wanting, or faintly indicated. 

 Crust smooth, sometimes with slight indications of strife. Limb 

 on the head disappearing; on the pygidium it becomes broad. 

 Type, Agnostus Icevigatus Dalm. 



Sec. V. ARTHRORHACHIS. The glabella is prominent, long and marked 

 with small basal lobes; the axis of the pygidium is short, as in 

 Agnoatus tardus Barr. 



ACADICUS Hartt, 1868; Acadian Geology, p. 655, fig. 229 (3d ed.) St. 



John, N. B. Taconic. 



Syn., similis Hartt, 1868; Acadian Geology, p. 656, (3d. ed.) 



similis Hartt (Walcott), 1884; Bull. U. S. Geol. Survey, No. 

 10, p. 22. 



- ACADICUS Wai., 1884; Bull. U. S. Geol. Survey, No. 10, p. 22, pi. 2, 



figs. 2, 2 a, c. 



ACADICUS Vogd., 1892; American Geol., vol. 4, p. 386, pi. 9, fig. 7. 



Sec. Limbati. 



ACADICUS var. DECLIVIS Matt., 1885; Trail. Koyal. Soc. Canada, vol. 



3, p. 70, pi. 7, figs. 6 a-b. St. John. 



ACADITUS var. DECLIVIS, Vogd., 1892; American Geol., vol. 4, p. 387, 



pi. 9, fig. 8. Sec. Limbati. 



- ACUTILOBUS Matt., 1885; Trans. Koyal Soc. Canada, vol. 3, p. 73, pi. 



7, fig. 10. St. John. 



- ACUTILOBUS Vogd., 1892; American Geol., vol. 4, p. 384, pi. 9, fig. 1. 



Sec. Longifrontes. 



AMERICANUS Bill., 1860; Canadian Naturalist, vol. 5, p. 302, fig. 1. 



Point Levis, Quebec. Tacouic. 



AMERICANUS Bill., 1865; Pal. Foss., vol. 1, p. 395, fig. 372. 



AMERICANUS Brogg., 1886; Geol. Foren. Stock. Forhandl., vol. 8, p. 



207. cf. Agnostus punctuosus Ang. var. 



AMERICANUS Vogd., 1892; American Geol., vol. 4, p. 389, pi. 9, fig. 5. 



Sec. Longifrontes. 



BISECTUS Matt., 1891; Trans. Koyal Soc. Canada, vol. 9, p. 50, pi. 13, 



figs. 2 a b. Navy Island, St. John, N. B. Taconic. 



- BIDENS Meek, 1873; 6th Ann. Rep. U. S. Geol. Survey Territories, p, 



463. Gallatin City, Montana. Taconic." 



- BIDENS Wai., 1884; Pal. Eureka Dist., Mon. U. S. Geol. Survey, vol. 



8, p. 26, pi. 9, figs. 13, 13 a. 



BIDENS Brogg., 1866; Geol. Foren. Stock. Forhandl., vol. 8, p. 207. 



cf. Agnostus par v if rons Linrs. 



