Monographs of the United States Geological Survey, Band 24U.S. Government Printing Office, 1894 Some nos. accompanied by atlases. |
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Acad Academy of Natural AMYCLA aperture apex Arca Astarte Atlantic City beak body whorl Carolina Check List Miocene collection at Rutgers columella concentric lines Conch Conchology Conrad Conrad's figure convex crenulated Cumberland County distinct Emmons EXPLANATION OF PLATE flattened Formation and locality Fossils fragments Gabb Genus Geol Heilprin hinge idonea imperfect impressed lines inch interior Jericho Jersey Jour left valve length lines of growth List Miocene Foss longitudinal lunule marls Meek Mercenaria Mioc Miocene marls MONOGRAPH XXIV PLATE Mysia narrow National Museum Natural Sciences nearly oblique outer lip ovate Phil Phila Plioc posterior side Proc prominent ribs ridges right valve rounded Rutgers College Say's Scapharca seen shell Shiloh showing slightly species spiral lines spire striæ striated suture Tellina Tert thick thickened tooth Tuomey and Holmes TURRITELLA type specimen U. S. GEOLOGICAL SURVEY umbilicus upper valve ventricose views volutions Whitf
Beliebte Passagen
Seite 56 - Suborbicular, with about twenty-five convex ribs, and wrinkled across; inner margin crenate. "Beaks nearly central, a little prominent, curved backward: ribs granulated on the umbones, and transversely wrinkled near the base, convex : apices somewhat prominent beyond the general curve of the shell: inner margin and edge crenate: cardinal teeth two. " Length from the apex to the base four-fifths of an inch, breadth nearly the same. " Rather proportionally longer than the decussata and more oblique.
Seite 35 - Ovate, thick, profoundly and irregularly plicated ; inferior valve ventricose; ribs acute, with arched spiniform scales; cardinal teeth large, curved, laterally striated, crenulated on the margins; larger cardinal tooth in each valve slightly bifid, broad; muscular impression prominent. . . . The valves have about ten folds, and the lower valve closely resembles a variety of Ostrea Virginia/no.
Seite 80 - Shell orbicular, slightly oblique, polished, white, with very minute and numerous concentric wrinkles near the margin, which are obsolete on the disk and umbo ; lateral teeth none ; primary teeth two in the left valve and one in the other ; interior ligament cavity subfusiform, as long as the exterior ligament.
Seite 48 - Shell oblong, compressed, thin, with very numerous radiating granulated striae ; beaks not prominent ; base much contracted or emarginate anterior to the middle; posterior side dilated, the superior margin very oblique and emarginate; extremity angulated, and situated nearer to the line of the hinge than to that of the base; cardinal teeth minute, except towards the extremities of the cardinal line, where they are comparatively very large and oblique; inner margin entire.
Seite 89 - Sci., vol. iii, pt. iv. p. 829. Description. — " Shell oblong, subovate, ventricose; disks with concentric, unequal, shallow grooves; lines of growth coarse and prominent; anterior extremity slightly gaping; anterior margin rounded, anterior dorsal margin elevated; posterior side narrowed, somewhat produced, not reflected; posterior dorsal margin nearly rectilinear; cardinal teeth obliquely compressed, united at base to the nympha, short and not very prominent.
Seite 79 - Shell triangular ; anterior margin obliquely truncated, cordate, suture a little convex ; posterior hinge margin nearly rectilinear, suture indented ; base a little prominent, beyond a regular curve, near the middle ; valves longitudinally striated with numerous, equal, parallel, regular, impressed lines, hardly visible to the unassisted eye, and obsolete on the posterior margin j basal edge within crenate.
Seite 82 - LATERALIS. — Shell triangular, very convex, of a smooth appearance, but with very minute, transverse wrinkles ; lateral margins flattened, cordate, with a rectilinear, sometimes concave profile, one margin rounded at the tip, the other longer and less obtuse ; umbo nearly central, prominent. Length half an inch. Breadth thirteen-twentieths of an inch. Thickness seven-twentieths of an inch. Inhabits the coast of the United States. Cabinet of the Academy and Philadelphia Museum. A very common shell...
Seite 50 - ... within perlaceous, polished, edge strongly crenated; teeth of the hinge robust, the posterior series very distinct and regular. Greatest length, parallel with the posterior margin, three-tenths of an inch. Breadth less than two-fifths of an inch. Inhabits the southern coast. Cabinet of the Academy. Very much resembles JV".
Seite 121 - Shell thick, sub -globose, cinereous, with a black line revolving on the spire above the suture, and becoming gradually diluted, dilated, and obsolete in its course ; within brownish-livid ; a large incrassated callus of the same color extends beyond the columella, and nearly covers the umbilicus from above ; umbilicus with a profound sulcus or duplication.
Seite 119 - Shell suboval, thick, rufo-cinereous ; within whitish ; colunudla incrassated ; callous not continued over the upper part of the umbilicus, hardly extending beyond a line drawn from the base of the columella to the superior angle of the labrum : umbilicus free, simple.