. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. )7,Rep. _ â¢. Can., FiQ. eol., p. arthrus beckl lalonotus. Homalonotus delpiil- notus jacksoni. (or, as he spelt it, »hil. Trans., ,p. ku8, three-kerneled.] ighly convex, a wide witn several rows of posterior angles, ter- es ; glabella pvriform, no lateral furrows; so eyes or facial su- â¢ow distinct; thorax ations, axis narrow,. Fio. 10«3.âTrlnu- cleiiHConceiitrl- eiiN. convex; side lobes wi
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. )7,Rep. _ â¢. Can., FiQ. eol., p. arthrus beckl lalonotus. Homalonotus delpiil- notus jacksoni. (or, as he spelt it, »hil. Trans., ,p. ku8, three-kerneled.] ighly convex, a wide witn several rows of posterior angles, ter- es ; glabella pvriform, no lateral furrows; so eyes or facial su- â¢ow distinct; thorax ations, axis narrow,. Fio. 10«3.âTrlnu- cleiiHConceiitrl- eiiN. convex; side lobes wide, flat, straight, pleural groove not reaching the margin; pygidium subtriangular, margin de- flected, axis conical, about six furrows; Hide lobes flat, with about the same number of furrows. Type T. concen- tricus. belhilus, Ulrich, 1878, Jour. Gin. 8oc. Nat. Hist., vol. 1. p. 99. The young of T. concentri- CUB. concentricus, Eaton, 1832, (Nuttainiaconcentrica,) Geo. Text-tfook, p. 128, and Pal. N. Y., vol. 1, p. 249, Trenton to Hud. Riv. Gr. Tnoi'iDocARis, Beecher, 1884, (ieo. Sur. Pa., vol. PPP, p. 15. [Ety. tropis, a keel; karis, a shrimp.] Carapace bivalve, Hemiovate or semielliptical, obliquely truncated behind; valves about twice as long as wide, having one or more longitudinal ridges; cephalic region indicated by elevations at the anterior end; optic node situate on a ridge; two segments of the abdomen. Type T. bicarinata. alternata, Beecher, 1884, Geo. Sur. Pa., vol. PPP, p. 19, Waverly Gr. bicarinata, Beecher, 1884, Geo. Sur. Pa., vol. PPP, p. 16, Chemung Gr. interrupta, Beecher, 1884, Geo. Sur. Pa., vol. PPP, 18, Chemung Gr. 'A8, Woodward, 1865, Quar. Jour. Geol. Soc., vol. 21. p. 48d. [Ety. turru, tower; lepag, scale.] Elongate, cone- sbaped bodies, composed of from 4 to 6 vertical ranges oi Hcale-like, subtri- a!igular plates covered with elevated concentric lines; plates of middle range convex and bearing a median carina. Type T. wrigh
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
