. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. occurs, with its varieties, in all the Groups of the Upper Silurian and Devonian formations, except the Oris- kany sandstone. Some of varieties or synonyms are, Atrypa affiuis, A. lenti- /ormis, A. prisca, A. tribulis, Hippuri- onyx consimilw, etc. robitsta, see Rhynchonella robusta. roslratit, see Meristella rostrata. rugosu, see Rhynchonella rugosa. scUula, see Meristella scitula. semiplicata, see Rhynch
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. occurs, with its varieties, in all the Groups of the Upper Silurian and Devonian formations, except the Oris- kany sandstone. Some of varieties or synonyms are, Atrypa affiuis, A. lenti- /ormis, A. prisca, A. tribulis, Hippuri- onyx consimilw, etc. robitsta, see Rhynchonella robusta. roslratit, see Meristella rostrata. rugosu, see Rhynchonella rugosa. scUula, see Meristella scitula. semiplicata, see Rhynchonella semiplicata. eingulai-ig, see Eatonia singularis. sordida, see Rhynchonella sordida. spinosa, Hall, 1843, Geo. 4th Dist. N. Y., p. 200, Cornif., Ham., Tully, and Che- mung Grs. Equal to Atrypa aspera var. occidentalis. mbcuboides, D'Orbigny, see Rhynchonella venustula. subtrigonalit, see Rhynchonella subtrig- onalis. sulcata, see Merista sulcata. tenuilineata. Hall, 1843, Geo. 4th Dist. N. Y., p. 272, Chemung Gr. tribulis, syn. for Atrypa reticularis. tumida, see Athyris tumida. unguiformis, syn. for Orthis proximus. unisulcata, see Meristella unisculcata. AuLosTEGES, Helmersou, 1847, Bull, de la Classe Pliysi. Math. Acad. Sci. St. Pe- tersburg, vol. 6, p. 135. [Ety. auhs, tube; stege, chamber.] Shell subpen- tagonal; ventral valve most FiQ. fAi âAulosteges wanKenhelini. h, Triangu- lar hinge area; d, convex pseudodellidiuin ; j, cardinal process; a, adductor impression. beak produced, twisted, area triangular, interrupted by a pseudodeltidium not reaching the hinge-line, which is straight and toothless; dorsal valve convex at the umbo, depressed or con- cave laterally; cardinal edge more or less developed; surface of valves with short tubular spires; in the interior of the dorsal valve a trifid cardinal pro- cess is made to fill the uncovered portion of the fissure, and servo as the point of attachment to the ciirdinal muscle; under this process a longit
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
