CATALOGUE OF TRILOIJITES. 263 



AGNOSTUS. 



Series B (Fallaces). This series has a smaller head, aucl moderately 

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

 posterior lobe to the axis of the pygidium. Type Agnoslus fuUux 

 Linrs. 

 Sec. IV. L^viGATi. The dorsal grooves marking the glabella and 

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

 Crvist smooth, sometimes with slight indications of striiB. Limb 

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

 Type, Acjnostus Imvigatun Dalm. 

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

 with small basal lobes; the axis of the pj'gidinm is short, as in 

 Ar/nontns tardus Barr. 



ACADICU8 Hartt, 1868; Acadian Geology, p. 6.j5, tig. -I'ld (.3d ed.) St. 



John, N. B. Taeonic. 



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



slmilis Hartt (Walcott), 1884; Bull. U. S. Geol. SiTrvej^ No. 

 10, p. 22. 



ACABicus Wal., 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, tig. 7. 



Sec. Limbati. 



ACADICUS var. declivis Matt., 1885; Tran. 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, lig. 1. 



Sec. Lougifroutes. 

 AMERICANU.S Bill., I860; Canadian Naturalist, vol. o, p. 302, fig. 1. 



Point Levis, Quebec. Taeonic. 



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



AMERICANUS Brijgg., 1886; Geol. F()ren. Stock. Fiirhandl., vol. 8, p. 



207. cf. Arjnostus punctuosns Aug. 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. 1.3, 



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



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



463. Gallatin City, Montana. Taeonic. 



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



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



BIDENS Brogg., 1866; Geol. Fiiren. Stock. Furhandl., vol. S, p. 207. 



cf. Afjnostus parrifrons Linrs. 



