Proceedings of the United States National Museum, Volume 39

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Smithsonian Institution Press, 1911 - Science
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Page 423 - ... upon the last turn ; on this they are decidedly enfeebled. The junction of the axial ribs and spiral cords forms feeble nodules. The entire surface of the spire between ribs and interspaces is crossed by fine spiral and axial threads which lend it a fine clothlike texture. Suture strongly constricted. Periphery of the last whorl well rounded. Base moderately long, well rounded, marked by seven equally spaced spiral threads, of which the seventh immediately behind the inner lip is feeble.
Page ii - Museum, and setting forth newlyacquired facts in biology, anthropology, and geology derived therefrom, or containing descriptions of new forms and revisions of limited groups. A volume is issued annually, or oftener, for distribution to libraries and scientific establishments, and in view of the importance of the more prompt dissemination of new facts a limited edition of each paper is printed in pamphlet form in advance.
Page ii - Publications of the United States National Museum The scientific publications of the National Museum include two series, known, respectively, as Proceedings and Bulletin. The Proceedings series, begun in 1878, is intended primarily as a medium for the publication of original...
Page ii - Since 1902 the volumes of the series known as " Contributions from the National Herbarium," and containing papers relating to the botanical collections of the Museum, have been published as bulletins. The...
Page 450 - ... developed. No suborbital stay. Mouth moderate or large, usually terminal, low and horizontal; premaxillaries moderately protractile, their spines not extending to the occiput; maxillary long, without supplemental bone...
Page 422 - Suture well marked. Periphery of the last whorl well rounded. Base rather short, inflated, narrowly umbilicated and marked like the spire. Aperture broadly ovate, somewhat effuse anteriorly. Posterior angle acute; outer lip thin, strongly curved in the middle; columella slender, strongly curved and reflected anteriorly, provided with a weak fold near its insertion; parietal wall glazed by a thin callus. The type (Cat. no.
Page 450 - Lateral line well developed, concurrent with the back, not extending on the caudal fin. Head large, the crests on the skull usually largely developed. No suborbital stay; mouth moderate or large, usually terminal, low and horizontal. Premaxillaries moderately protractile, their spines not extending to...
Page 448 - Dorsal flu continuous, •with 12 spines •which may be depressed in a shallow groove; soft rays of dorsal and anal fins elevated; anal spines graduated; bases of soft dorsal and anal thickened and scaly; caudal rounded. Air-bladder present. Pyloric cceca 3; vertebrae 13 + 11.
Page 476 - Etelis with Aprion are very close. The skulls in the two are almost identical, as has already been noticed by Poey and Gill.
Page 422 - Nuclear whorls two and onetenth, moderately rounded, smooth. Post-nuclear whorls strongly rounded, somewhat inflated, appressed at the summit, marked by broad, low, strong, protractive, axial ribs, of which 14 occur upon the first to third, 16 upon the fourth, and 18 upon the penultimate whorl. In addition to the axial ribs, the whorls are marked on the spire by three feebly impressed, spiral lines which pass over the ribs as well as the broad, intercostal spaces. The middle one of these three lines...

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