. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. I'KN.] liRACmorODA. :mi >ntr»t.'\ Ventral viilvo ^ibhouH, Ix^ak Incurvetl, lUsure triunKnIur, nn-a nar- niw, iiu'Hial HiiiUM; in th«nvi'X, ineHial fold ; crura conjoinecl at their baneM, niakint; a V-Hliapt-il pit. which iH attached to the valvo in itH upper part, and continiicH HeHNilu for about half the length of the Hhell; Hurface plicated. Type P. arata. aratH, Conratl, IH*1, (Atry|)a arata and .\t- ry
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. I'KN.] liRACmorODA. :mi >ntr»t.'\ Ventral viilvo ^ibhouH, Ix^ak Incurvetl, lUsure triunKnIur, nn-a nar- niw, iiu'Hial HiiiUM; in th«nvi'X, ineHial fold ; crura conjoinecl at their baneM, niakint; a V-Hliapt-il pit. which iH attached to the valvo in itH upper part, and continiicH HeHNilu for about half the length of the Hhell; Hurface plicated. Type P. arata. aratH, Conratl, IH*1, (Atry|)a arata and .\t- rypa octo-coH- tat^,) Ann. Kep. N. Y., p. T)'), and I'al. N. Y., vol. 4, j). ;;), Schoharie trrit and Up. Held. <ir. cotnpreHsa, liinK' uebert?, 188(1, Huf. .S)c. Nat. .'0, (Spirifer du- l)iu8,) llJth liep. N. Y. St. Hum. Cir. N. Y., vol. 4, âi'cnlanierellft Hide vli'w. )orsal view. Mu8. Nat. Hist., p. 90, micula, Hall, 1H()7, I'al. 378, Ham. (Jr. obsoleaceuH, Hall, »i7, Pal. N. Y., vol. 4, p. 371t, Devonian. papilionensis. Hall, 1858, (Pentainerus papilionensis,) Geo, Rep. Iowa, vol. I, pt. 2, p. ")14, Ham. <ir. Fkstamkrun, Sowerby, 1812, Min. Conch., vol. I, p. 7;i. [Kty. jieiilti, fivt^; inrnix, aparUnents.] Shell glob-^ae, ovate, re- â¢ejving valve largest; generally d- 'â - lute ot mesial fold and sinus, 'ui winn present, the fold is in ihf â¢â¢^^ and the sinus in the ent* r .it', ai. ; no hinge-line; area large, ^pflnH', and having a deep, triangi'Lir ,'â¢â [ in 'h\ center, under tin* be k I d,. do)~ I valve, and into which lin: ucali. Im entering valve is strongly incurved; internally the receiving valve has one large bipartite central septum, the walls of which suddenly divaricate as they ap- proach the ent» ring valve, forming the walls of the external triangular open- intr, and between them a triangular chaMib^-r much smaller than the two lateral ones; in the entering valve the two corr
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
