560 



CRUSTACEA. 



[PEV — PHI. 



nevadensis, Meek, see Olenoides nevad- 



ensis. 

 quadrispinoms, Emmons, syn. for Bathy- 



notus holopyga. 

 regina, Matthew, 1887, Am. Jour. Sci. 

 and Arts, 3d ser., vol. 33, p. 389, and 

 Trans. Roy. Soc. Canada, p. 115, St. 

 John Gr. 

 tenellus, Billings, 1874, Pal. Foss., vol. 2, 



Up. Taconic. 

 thompsoni, see Elliptocephala thompsoni. 

 triarthrv.s, Harlan, syn. for Triarthrus 



becki. 

 vermoniana, see Mesonacis vermontana. 

 Peltura, M. Ed wards, 1840, Hist. Nat. 

 Crust., t. 3, p. 344. Type P. scara- 

 bseoides. 

 holopyga, see Bathynotus, holopvga. 

 Pemimim, asi-is, Hall, 1863, 16th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 221. [Ety.pem- 

 phix, pustule; aspis, shield.] Founded 

 upon part of a shield somewhat re- 

 sembling the pygidium of a trilobite ; 

 a narrow, straight, annulated axis ex- 

 tends to the margin posteriorly ; side 

 lobes wider, ovate and ventricose. 

 Tvpe P. bullata. 

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

 Mus. Nat. Hist., p. 211, Potsdam Gr. 

 Phacois, Emmrich, 1839, de Trilobites, 

 Dissertatio Inauguralis, p. 19. [Ety. 

 phakos, lens; ops, eye.] Form compact, 

 glabella inflated and expanded in front; 

 the two front pairs of furrows are ob- 

 scure ; eyes large, numerous lenses; 

 genal rounded ; pleura; rounded, pygid- 

 ium moderate, of few (often coa- 

 lesced) segments with an even border, 

 never produced. Type P. latifrons. 



bufo, Green, 1832, 

 (Calymene bufo,) 

 Monograph of Trilo- 

 bites, p. 41, and Illust. 

 Devon. Foss., pi. 8, 

 Ham. Gr. 

 bombifrons, Hall, 1862, 

 15th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 

 67, Up. Held. Gr. 

 cacapona, Hall, 1862, 

 15th Rep. N. Y. St. 

 Mus. Nat. Hist. p. 

 68, Up. Held. Gr. 

 callicephala, see Dalmanites callicephalus. 

 cristata, Hall, 1862, 15th Rep. N. Y. St. 



Mus. Nat. Hist., p. 67, Up. Held. Gr. 

 cristata var. pipa, Hall, 1888, Pal. N. Y., 



vol. 7, p. 18, Up. Held. Gr. 

 hudsonica, Hall, 1859, Pal. N. Y., vol. 3, 



p. 355, Low. Held. Gr. 

 laticaudus, see Dalmanites laticaudus. 

 logani, Hall, 1859, Pal. N. Y., vol. 3, p. 353, 



Low. Held. Gr. 

 nupera, Hall, 1843, (Calymene nupera,) 

 Geo. Rep. 4th Dist. N. Y., p. 262, and 

 Illust. Devon. Foss., pi. 8, Che- 

 mung Gr. 

 orestes, Billings, 1860, Can. Nat. and Geo., 

 vol. 4, p. 65, Mid. Sil. 



Fig. 1042.— Phacops 

 bufo. 



rana, Green, 1832, (Calymene bufo var. 

 rana,) Monograph of Trilobites, p. 42, 

 ami Illust. Devon. Foss., pi. 7, 

 Ham. Gr. 



trajanus, Billings, 1863, Proc. Port. Soc. 

 Nat. Hist., vol. 1, p. 124, Low. 

 Held. Gr. 



trisulcata, Hall, 1843, (Calymene (?) trisul- 

 cata,) Geo. Rep. 4th Dist. N. Y., p. 74, 

 and Pal. N. Y., vol. 2, p. 300, Clin- 

 ton Gr. 

 Phjethonides, Angelin, 1878, Pakeonto- 

 logia Scandinavica, p. 21. [Ety. phx- 

 thon, radiant.] Head shield resembling 

 Cyphaspis, the frontal area more con- 

 cave, and lateral glabellar furrows 

 stronger and generally duplicate ; 

 thorax having seven or more narrow 

 segments ; axis wide ; pygidium re- 

 sembling Proetus, relatively large, 8 to 

 12 annulations on the axis, and 8 or 9 

 on the pleura'; these extend to the 

 margin, and are duplicate the entire 

 length. Type P. stokesi. 



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

 p. 134, Up. Held. Gr. 



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

 p. 137, Low. Held. Gr. 



denticulatus, Meek, 1877, (Proetus den- 

 ticulatus,) Geol. Expl. 40th Par., p. 49, 

 Devonian. 



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

 p. 136, Low. Held. Gr. 



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

 p. 135, Up. Held Gr. 

 Phillipsia, Portlock, 1843, Rep. Geol. Lon- 

 donderry, p. 305. [Ety. proper name.] 

 Cephalic shield sub- 

 semicircular, angles 

 terminating in spines ; / • j 

 glabella subcylindri- // 

 cal, not contracted at 

 base, three furrows 

 on each side ; eyes 

 large, reniform, retic- ,^ 

 ulated ; thorax of 9 k2§5 

 segments having pleu- * 

 ral grooves and dis- 

 tinct facets ; pygidium 

 semioval, axis and 

 lateral lobes furrowed, 

 margin entire, smooth. 

 Type P. gemmulifera.^^- u p 1 ^ 1 r i a p - 



auriculatus, Hall, 1862, 



(Proetus auriculatus,) 15th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 79, Waverly Gr. 



bufo, Meek & Worthen, 1870, Proc. 

 Acad. Nat. Sci., p. 52, and Geo. Sur. 

 111., vol. 5, p. 528, Keokuk Gr. 



cliftonensis, Shumard, 1858, Trans. St. 

 Louis Acad. Sci., vol. 1, p. 227, Coal 

 Meas. 



coronata, Hall, syn. for Cyphaspis or- 

 nata. 



doris, Hall, 1860, (Proetus doris,) 13th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 112, 

 Waverly Gr. 



howi, Billings, 1863, Can. Nat. and Geol., 

 vol. 8, p. 209, Carboniferous. 



