REM.] 



CRUSTACEA. 



565 



forward from the eyes, so as to intersect 

 the anterior margin within a point 

 where a line would cut it if drawn 

 through each eye parallel with the axis 

 (Corda's figure makes the facial sutures 

 cut the margin laterally, in a line drawn 

 at right angles to the anterior end of 

 the glabella) ; these lines extend them- 

 selves from the eyes to the posterior 

 margin by making a double curve, and 

 cut the margin within or near the lat- 

 eral angles; fixed cheek arched down- 

 ward at the sides ; occipital ring spined ; 

 thoracic segments fourteen ; ends of 

 pleurae pointed or rounded; pygidium 

 medium size, six or seven articulations 

 in the axis ; surface of test with minute 

 punctures or scattered tubercles. Type 

 P. striata. 



affinis, Walcott, 1884, Mon. U. S. Geo. Sur., 

 p. 54, Potsdam Gr. 



anatina, Hall, 1863, (Conocephalites ana- 

 tinus,) 16th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 158, Potsdam Gr. 



(?) annectans, Walcott, 1884, Mon. U. S. 

 Geo. Sur., vol. 8, p. 91, Pogonip Gr. 



antiquatus, Salter, 1859, (Conocephalites 

 antiquatus,) Jour. Geo. Soc., vol. 15, p. 

 554, Up. Taconic. 



arenosa, Billings, 1861, (Conocephalites 

 arenosus,) Pal. Foss., vol. 1, p. 15, Pots- 

 dam Gr. 



billingsi, Shumard, 1861, (Conocephalites 

 billingsi,) Am. Jour. Sci. and Arts, vol. 

 32, p. 220, Potsdam Gr. 



binodosa, Hall, 1863, (Conocephalites bi- 

 nodosa,) 16th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 160, Potsdam Gr. 



breviceps, Walcott, 1884, Mon. U. 8. Geo. 

 Sur., vol. 8, p. 49, Potsdam Gr. 



calciferus, Walcott, 1879, (Conocephalites 

 calciferus.) 32d Rep. N. Y. St. Mus. Nat. 

 Hist., p. 129, Calciferous Gr. 



calymenoides, Whitfield, 1877, Geo. Sur. 

 Wis., vol. 4, p. 179, Potsdam. Gr. 



clavata, Walcott, 1877, Am. Jour. Sci., 3d 

 ser., vol. 34, p. 198, Up. Taconic. 



cordillerse, Rominger, 1887, (Conocepha- 

 lites cordillerse,) Proc. Acad. Nat. Sci. 

 Phil., p. 12, Potsdam Gr. 



depressa, Shumard, 1861, (Conocephalites 

 depressus,) Am. Jour. Sci., vol. 32, p. 

 219, Potsdam Gr. 



dissimilis, Walcott, 1884, Mon. U. S. Geo. 

 Sur., vol. 8, p. 51, Up. Taconic, Pros- 

 pect Mountain Gr. 



eryon, Hall, 1863. (Conocephalites eryon,) 

 16th Rep. N. Y. St. Mus. Nat. Hist., p. 

 157, Potsdam Gr. 



explanata, Whitfield, 1882, (Conocepha- 

 lites explanatus,) Geo. Sur. Wis., vol. 4, 

 p. 181, Potsdam Gr. 



fitchi, Walcott, 1887, Am. Jour. Sci., 3d 

 ser., vol. 34, p. 197, Up. Taconic. 



hartti, Walcott, 1879, (Conocephalites 

 hartti,) 32d Rep. N. Y. St. Mus. Nat. 

 Hist., p. 130, Calciferous Gr. 



housensis, Walcott, 1886, Bull. U. S. Geo. 

 Sur., No. 30, p. 201, Up. Taconic. 



37 



leeviceps, Walcott, 1884, Mon. U. S. Geo. 

 Sur., p. 54, Potsdam Gr. 



(?) linnarsoni, Walcott, 1884, Mon. U. S. 

 Geo. Sur. Terr., vol. 8, p. 47, Up. Ta- 

 conic. 



minor, Shumard, 1863, (Conocephalites 

 minor,) Trans. St. Louis Acad. Sci., vol. 

 2, p. 105, Potsdam Gr. 



minuta, Bradley, 1860, (Conocephalites 

 minutus,) Am. Jour. Sci., 2d ser., vol. 

 30, p. 242, Potsdam Gr. 



nasuta, Hall, 1863, (Conocephalites nasu- 

 tus,) 16th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 155, Potsdam Gr. 



occidentalis, Walcott, 1884, Mon. U. S. 

 Geo. Sur., vol. 8, p. 51, Potsdam Gr. 



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

 Mus. Nat. Hist., p. 155, Potsdam Gr. 



patersoni, Hall, 1863, (Conocephalites pat- 

 ersoni,) 16th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 159, Potsdam Gr. 



pernasuta, Walcott, 1884, Mon. U. S. Geo. 

 Sur., vol. 8, p. 49, Potsdam Gr. 



perseus, Hall, 1863, (Conocephalites per- 

 seus,) 16th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 153, Potsdam Gr. 



piochensis, Walcott, 1886, Bull. U. S. Geo. 

 Sur., No. 30, p. 201, Up. Taconic. 



(?) prospectensis, Walcott, 1884, Mon. 

 U. S. Geo. Sur., vol. 8, p. 46, Up. Ta- 

 conic Prospect Mountain Gr. 



(?) quadrata, Whitfield, 1880, (Conoceph- 

 alites quadratus,) Geo. Sur. Wis., 

 vol. 4, p. 180, Potsdam Gr. 



rogersi, Walcott, 1884, Bull. U. S. Geo. 

 Sur., vol. 2, p. 283, Up. Taconic. 



shumardi, Hall, 1863, (Conocephalites 

 shumardi,) 16th Rep. N. Y. St. Mus. 

 Nat. Hist., p. 154, Potsdam Gr. 



similis, Walcott, 1884, Monogr. U. S. Geo. 

 Sur., vol. 8, p. 52, Potsdam Gr. 



similis var. robusta, Walcott, 1884, Mon. 

 U. S. Geo. Sur., vol. 8, p. 53, Pots- 

 dam Gr. 



subcoronata, Hall & Whitfield, 1877, 

 (Conocephalites subcoronatus,) Geo. 

 40th Par., vol. 4, p. 237, Up. Taconic. 



teucer, Billings, 1861, (Conocephalites 

 teucer,) Geo. Vt., vol. 2, p. 951, Geor- 

 gia Gr. 



verrucosa, Whit- 

 field, 1884, 

 (Conocephalites 

 verrucosu*s,) 

 Bull. Am. Mus. 

 Nat. Hist., vol. - 

 1, p. 139, Pots- FIG - 

 dam Gr. 



winona, Hall, 1863, (Conocepbalites wi- 

 nona,) 16th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 161, Potsdam Gr. 

 zenkeri, Billings, 1860, (Conocephalites 

 zenkeri, Can. Nat. and Geo., vol. 5, 

 and Pal. Foss., vol. 1, p. 398, Up. Ta- 

 conic. 



REMOPLEURIDES, Portlock, 1843, Rep. Geol. 

 Lond., p. 254. [Ety. remus, oar ; pleura, 

 rib.] Cephalic shield subcircular or 

 transversely subelliptical; glabella large, 



