554 



CRUSTACEA. 



[we. 



cutting the outer margin in front of the 

 angles ; thorax of ten segments ; pleurae 

 flat, falcate, each with a furrow not 

 reaching the margin ; pygidium, side 

 lobes flat, two falcate ribs on each side 

 projecting beyond the margin, each 

 with a mesial duplicating groove, mid- 

 dle lobe, semielliptical, pointed. Type 

 L. laciniatus. 



FIG. 1024. Lichas faberi. Mag. 2 diam. 



armatus, Hall, 1862. Preoccupied; changed 



to L. eriopis. 

 bigsbyi, Hall, 1859, Pal. N. Y., vol. 3, p. 



364, Low. Held. Gr. 



boltoni, Bigsby, 1825, (Paradoxides bol- 

 toni,) Jour. Acad. Nat. Sci., vol. 4, p. 



365, and Pal. N. Y., vol. 2, p. 311, Ni- 

 agara Gr. 



boltoni var. occidentalis, Hall, 1863, 

 Trans. Alb. Inst., vol. 4, p. 223, and 

 llth Rep. Ind. Geo. Sur., p. 344, Niag- 

 ara Gr. 



breviceps, Hall, 1863, Trans. Alb. Inst., 

 vol. 4, p. 222, and llth Eep. Ind. Geo. 

 Sur., p. 343, Niagara Gr. 



canadensis, Billings, 1866, Catal. Sil. Foss. 

 Antic., p. 65, Antic. Gr. 



cbamplainensis, Whitfield, 1886, Bull. Am. 

 Mus. Nat. Hist, vol. 1, p. 342, Birds- 

 eye Gr. 



cucullus, Meek & Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil., p. 266, and Geo. 

 Sur. 111., vol. 3, p. 299, Trenton Gr. 



decipiens, Winchell & Marcy, 1865, Mem. 

 Bost. Soc. Nat. Hist., p. 104, Niag- 

 ara Gr. 



draoon. Hall, 1888, Pal. N. Y., vol. 7, p. 

 85, Up. Held. Gr. 



emarginatus, Hall, 1879, 28th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 199, Niag- 

 ara Gr. 



eriopis, see Terataspis eriopis. 



faberi, n. sp. Broadly elliptical, granu- 

 lated ; head somewhat crescentiform, 

 slightly pointed in front, very convex, 

 posterior angles terminating in short, 

 obtuse spines ; glabella very convex, 

 divided into three lobes; central lobe 

 contracted in the middle, widely ex- 

 panded in front, and less expanded be- 

 hind, and a slight furrow cuts off a 

 small lobe from the postero-lateral 

 angles ; lateral lobes reniform ; and an- 

 other small lobe is separated from the 

 posterior part of the cheeks by a 

 stronger furrow-; eyes prominent, reni- 

 form, and directed backward ; occipital 

 ring wide ; axial lobe of thorax wider 

 than the lateral lobes; pygidium lacini- 

 ate, axis with two narrow articulations 

 in front, and a longer posterior one 

 that slopes backward and becomes con- 

 fluent with the expanded border ; lat- 

 eral lobes composed of three expanded 

 articulations, which terminate in acute 

 points, and are marked in the central 

 part by a groove for three-fourths of 

 their length, which is represented by a 

 rib on the under side ; central lobe 

 grooved in like manner, and bifid at 

 the posterior extremity. The pygid- 

 ium will readily distinguish it from L. 

 trentonensis, beside the broader axial 

 lobe of the thorax and somewhat differ- 

 ent cephalic shield. Hud. Riv. Gr. at 

 Cincinnati, Ohio. The specimen illus- 

 trated is from the collection of Charles 

 Faber. 



FIG. 1025. Lichas faberi. Large and small 

 pygidium. 



grandis, see Terataspis grandis. 



gryps, Hall, 1888, Pal. N. Y., vol. 7, p. 84, 



Up. Held. Gr. 

 harrisi, S. A. Miller, 1878, Jour. Cin. 



Soc. Nat. Hist., vol. 1, p. 106, Hud. 



Riv. Gr. 

 hispi-his, Hall, 1888, Pal. N. Y., vol. 7, p. 



77, Up. Held. Gr. 

 hylseus, Hall, 1888, Pal. N. Y., vol. 7, p. 



81, Up. Held. Gr. 

 jukesi, Billings, 1865, Pal. Foss., vol. 1, pp. 



282 and 335, Quebec Gr. 

 minganensis, Billings, 1865, Pal. Foss., 



vol. 1, p. 181, Chazy or Black Riv. Gr. 

 nereus, Hall, 1863, 16th Rep. N. Y. St. 



Mus. Nat. Hist., p. 226, Niagara Gr. 

 obvius, Hall, 1868, 20th Rep. N. Y. St. 



Mus. Nat. Hist., p. 424, Niagara Gr. 

 ptyonurus, Hall, 1888, Pal. N. Y., vol. 7, 



p. 86, Niagara Gr. 

 pugnax, Winchell & Marcy, 1865, Mem. 



Bost. Soc. Nat. Hist, p. 103, Niag- 

 ara Gr. 



