Report of the United States Geological Survey of the territories . wed rather as forming a distinct genusthan a subgenus under that group. In general appearance, some of the species of the group Neptune/laresemble certain recent forms, such as Fususl dilatatus, Quoy and Gaimard,referred by H. and A. Adams to the genus Neptunea, Bolten. Yet they differfrom the recent typical forms of the latter genus, such as Fusus antiquus,Lamarck, in being thicker shells, with more angular volutions, and in wantinga papillary apex, as well as in having a solid axis, a straight canal, and noumbilical ridge. Th
Report of the United States Geological Survey of the territories . wed rather as forming a distinct genusthan a subgenus under that group. In general appearance, some of the species of the group Neptune/laresemble certain recent forms, such as Fususl dilatatus, Quoy and Gaimard,referred by H. and A. Adams to the genus Neptunea, Bolten. Yet they differfrom the recent typical forms of the latter genus, such as Fusus antiquus,Lamarck, in being thicker shells, with more angular volutions, and in wantinga papillary apex, as well as in having a solid axis, a straight canal, and noumbilical ridge. The classification of all such forms was, until recently, made easy byreferring them indiscriminately to that common receptacle of all sorts offusiform shells—the genus Fusus. They certainly, however, seem to differfrom that genus as typified by such forms as Fusus colus. So far as yet known, the genus Pyrifusus, as here understood, appears to be mainly, if not entirely, confined to the Cretaceous u 346 UNITED STATES GEOLOGICAL SURVEY OE THE Pyrifusiis (IVeptnnella) Ncwberryi, M. & H. Plate 31, figs. 6, a, b, c, <?, e, f. Fusus Newberryi, Meek and Haydeu (1856), Proceed. Acad. Nat. Sei. Pbilad., VIII, (Pyrifusiis 1) Newberryi, Meek and Hayden (1860), ih., XII, 421.—Meek (1864), Smithsonian Check-List N. Am. Cret. Fossils, 22. Fis-39- Shell rhorabic-subfusiform, rather thick; spire conical, acute at the apex when not eroded; volutions five, obliquelyflattened or a little concave above and convex around themiddle, where they are ornamented by a row of more orless prominent, vertically-elongated nodes, or costal; lastturn comparatively large, and tapering rather abruptly intothe rather short, straight canal below; surface marked bydistinct lines of growth, crossed by numerous well-defined,round, thread-like, revolving lines; suture linear; aperturerhombic-obovate, rather obtusely angular above, and nar-rowing more gradually below; outer lip beve
Size: 1188px × 2102px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1876
