. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 528 CRUSTACEA. [amp.—A>T. canadensis, Billintts, 1859, Can. Nat. and Geo , vol. 4, p. 381, Ohazy Gr. convpxiiB, BillingH, 1866, Pal. Fobs., vol. 1, p. 322, Quebec (ir. insulariH, Billings, 1805, Pal. Foss., vol. 1, p. 290, Quebec Gr. julii. us, Billings, 1805, Pal. Foss., vol. l,p. 290, Quebec Gr. matutinus, Hall, 1863, 16th Rep. N. Y. St. Mus, Nat. Hist., p. 222, Potsdam Gr. mulliBegmentatus, see Encrinurus mu
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 528 CRUSTACEA. [amp.—A>T. canadensis, Billintts, 1859, Can. Nat. and Geo , vol. 4, p. 381, Ohazy Gr. convpxiiB, BillingH, 1866, Pal. Fobs., vol. 1, p. 322, Quebec (ir. insulariH, Billings, 1805, Pal. Foss., vol. 1, p. 290, Quebec Gr. julii. us, Billings, 1805, Pal. Foss., vol. l,p. 290, Quebec Gr. matutinus, Hall, 1863, 16th Rep. N. Y. St. Mus, Nat. Hist., p. 222, Potsdam Gr. mulliBegmentatus, see Encrinurus multiseg- mentatus. nevadensis, Walcott, 1885, Monogr. U. S. Geo. Sur., vol. 8, p. 94, Chazy Gr. salteri, Billings, 1861, Can. Nat. and Geo., vol. 0, Calciferous Gr. westoni, Billings, 1865, Pal. Foss., vol. 1, p. 321, Quebec Gr. Ampiiipeltis, Salter, 1863, Quar. Jour. Geo. Soc, vol. 19, p. 75. [Ety. amphi, on both sides; peltis, provided with a shield or buck- ler.] Carapace oblong, oval, rounded in front, more truncate behind; thorax with 9 seg- ments, 5 project be- yond the carapace and 4 concealed beneath it; tail-piece semi- circular, as wide as the abdomen, and as long as the last three segments taken to- gether. Type A. para- doxus, paradoxus, Salter, 1863, Quar. Jour. Geo. Soc, vol. 19, p. 70, and Acad. Geo., p. 523, \5^. Devonian. Ampyx, Dulman, 1827, Uber die palseaden oder die sogenannten Triloblten, p. 53. [Ety. ampyx, head-band.] Cepnalic shield somewhat trigonal; glabella large, prominent, narrow behind, and pro- jecting upward and forward anteriorly; cheeks flattened, posterior angles pro- duced; no eyes or facial sutures; thoracic segments 5 or 6, flattened, sides straight, divided by a diagonal pleural groove; pygidium Rubtrigonal, nearly aa large as the cephalic shield; one anterior segmental furrow; axis faintly marked with transvens? furrows. Type .A. lltlBUtllB halli. Billing-^, 1861, Pal. Foss., vol. 1, p. 24, Ohazy Gr. Iseviuscnlus, Billings, 1865, Pal
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