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acute angular animal aperture apex appearance arrangement bands base beaks belong body brown Buccinum character closed colour columella compressed connected considered construction convex copper-plates covered distinct distinguished division eared entire external extremely figures flat gaping genera genus Helix hinge History imperforate Inhabits internal lateral length less lines Linnæan Lister Conch London longitudinally lower margin marked Murex natural nearly oblique Observations Ocean outer lip ovate pale perfect perforated perhaps Phil placed plaited plates possess posterior present projecting purplish raised rays reddish remark render resemblance ribs rough rounded seas separated Shell side situated slope smooth species Specimen white spines spiral spire straight striæ striate substance surface suture tapering teeth testaceous thin tooth Trans transversely univalve upper usually valves variety Venus VIII whorls yellow yellowish
Seite 86 - Afyoraimu, a companion of Jason in the celebrated voyage of the ship Argo. The art of navigation is supposed to have owed its origin to the expert management of this instinctive sailor. He was observed by the ancients, and subsequent experience has confirmed the observation, to raise himself to the surface of the sea by ejecting a quantity of water, and thus diminishing the specific gravity of his vessel. When floating in a calm, he would throw out two or more tentacula, to serve as oars.
Seite 31 - ... lilaliata. Bilabiate; constructed with both an internal and external lip; in opposition to those shells which are destitute of the interior one. dehiscens. Gaping ; the lower part of the lip being distended. coarctala. Coarctate; contracted, straight : opposed to effuse. effusa. Effuse; having the lips separated by a sinus or gutter, so that if the shell were filled with water it would flow out at the back part. reflexa. Reflex ; having the fore part of the lip reflected towards the lowest whorl....
Seite 91 - Greek xSivoi expresses the peculiar form to which the genus is indebted for its name. CYPR^EA. A. Mucronate, or with a projecting spire. (Plate XIV. Fig. 1.) B. Obtuse, and without manifest spire. (Fig. 2.) C. Umbilicate. (Fig. 3.) D. Margined. (Fig. 4.) SHELL univalve, involute, subovate, obtuse, smooth. Aperture effuse at both ends, linear, toothed on both sides, longitudinal. The genus is remarkable for the high polish which adorns it in its native state. The only species of other genera which...
Seite 104 - The very peculiar form of the aperture in this genus is a strong and never-failing distinctive feature. This is oblong-oval, or perfectly oval, seldom ovate, and does not gradually contract into a canal, but abruptly opens into it at the same or nearly the same width which it continues to retain throughout the whole length of the beak. Even in the division which is destitute of an exserted beak, the same contour is no less observable. The straightness of the rostrum is a much more questionable mark,...
Seite 224 - Varech, etc., et sur une petite Coquille qui se loge dans le tronc de cette plante — Méra.
Seite 79 - ... the division B. Strong locomotive powers have been attributed to the Pecten, which are, it is said, exerted in a most singular manner. A very rapid progress is effected by the sudden opening and closing of the shell. This is done with so much muscular force, as to throw it four or five inches at a time. In the water, an equal dexterity is evinced by the animal, in raising himself to the surface, directing his course ad libitum, and suddenly, by the shutting of his valves, dropping to the bottom.
Seite 234 - Essay towards a Natural History of the County of Dublin. Dublin, 1772.
Seite 232 - Paria, 1693, in- 4°, p. 376. POUPART. — Sur la progression du limaçon aquatique dont la coquille est tournée en spirale conique, in Journ.