638 



CRUSTACEA. 



[cha. — ai. 



bella, by the furrows, structure of the 

 thorax and form of central lobe, and by 

 the pygidium, beside occurring in 

 higher rocks and growing to a much 

 larger size. 

 (?) mercurius, Billings, 1865, (Cheirurus 

 mercurius,) Pal. Foss., vol. 1, p. 285, 

 Quebec Gr. or Up. Taconic. 

 niagarensis, Hall, 1867, 20tli Rep. N. Y. 

 St. Mus. Nat. Hist., p. 427, Niagara Gr. 

 numitor, Billings, 1866, (Cheirurus numi- 

 tor,) Catal. Sil. Foss. Antic, p. 27, Hud. 

 Riv. Gr. 

 nuperus, Billings, 1866, (Cheirurus nu- 

 perue,) Catal. Sil. Toss. Antic, p. 60, 

 Anticosti Gr. 

 (?) perforator, Billings, 1865, (Cheirurus 

 perforator,) Pal. Foss., vol. 1, p. 287, 

 Quebec Gr. or Up. Taconic. 



p le u r exanthe- 

 m us , Green, 

 1832, Monog. 

 Trilobites, p. 

 84, and Pal. N. 

 Y., vol. 1, p. 

 242, Trenton 

 and Hud. Riv. 

 <ir. 

 (?) poly dor u s, 

 Billings, 1865, 

 (Cheirurus 

 no ly dor u s,) 

 Pal. Foss., vol. 

 1, p. 286, Que- 

 bec Gr. or Up. 

 Taconic. 

 pompilius, Bill- 

 ings, 1865, 

 (Cheirurus 

 pompilius,) Pal. Foss., vol. 1. p. 181, 

 Chazy or Black Riv. Gr. 

 (?) prolificus, Billings, 1865, (Cheirurus 

 prolificus,) Pal. Foss., vol. 1, p. 285 and 

 325, Quebec Gr. or Up. Taconic. 

 pustuloses, syn. for Ceraurus pleurexanthe- 



mus. 

 rarus, Walcott, 1877, 31st Rep. N. Y. St. 



Mus. Nat. Hist., p. 68, Trenton Gr. 

 satyrus, Billings, 1865, (Cheirurus saty- 

 rus,) Pal. Foss., vol. ljp. 324, Chazy Gr. 

 (?) sol, Billings, 1865, (Cheirurus sol,) 

 Pal. Foss., vol. 1, p. 288, Quebec Gr. or 

 Up. Taconic 

 (?) solitarius, Billings, 1865, (Cheirurus 

 solitarius,) Pal. Foss., vol. 1,> p. 206, 

 Quebec Gr. or Up. Taconic. 

 tarquinius, Billings, 1863, (Cheirurus tar- 

 quinius,) Proc Port. Soc Nat. Hist., 

 vol.1, p. 121, Upper Silurian. 

 vigilans, see Encrinurus vigilans. 

 (?) vulcanus, Billings, 1865, (Cheirurus 

 vulcanus,) Pal. Fobs., vol. l,p. 284, and 

 324, Quebec Gr. or Up. Taconic. 

 Chariocephalus, Hall, 1863, 16th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 175. [Ety. 

 charts, charming or graceful ; kephate, 

 head.] Cephalic shield broad ; cheeks 

 moderately convex toward the eyes ; 

 glabella regularly convex and marked 



Fig. 984. — Ceraurus pleu- 

 rexanthemus. 



by transverse furrows; eyes large, 

 facial sutures cutting the contour of 

 the front at or near the center as in 

 Agraulus^ but distinguished by the 

 character of the palpebral lobe, large 

 eye, and form of the cheek. Type C. 

 whitfieldi. 



tumifrons, Hall & Whitfield, 1877, U. S. 

 Geo. Expl., 40th parallel, vol. 4, p. 224, 

 Potsdam Gr. 



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

 Mus. Nat. Hist., p. 175, Potsdam Gr. 

 Cheirurus, Beyrich, 1845, syn. for Ceraurus. 



apollo, see Ceraurus apollo. 



eryx, see Ceraurus eryx. 



glaucut, see Ceraurus glaucus. 



icarus, see Ceraurus icarus. 



mercurius, see Ceraurus mercurius. 



numitor, see Ceraurus numitor. 



nuperus, see Ceraurus nuperus. 



perforator, see Ceraurus perforator. 



polydorus, see Ceraurus polydorus. 



pompilius, see Ceraurus pompilius. 



prolificus, see Ceraurus prolificus. 



satyrus, see Ceraurus satyrus. 



sol, see Ceraurus sol. 



solitarius, see Ceraurus solitarius. 



tarquinius, see Ceraurus tarquinius. 



vulcanus, see Ceraurus vulcanus. 



Fig. 985,— Cliniachticlmites wllsoni. 



Climachtichnitks, Logan, 1860, Can. Nat. 

 and Geol., vol. 5, p. 279. [Ety. klimax, 

 ladder; ichnos, footstep.] A continuous 



