A Manual of the Mollusca: A Treatise on Recent and Fossil Shells

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Virtue & Company, 1868 - Mollusks - 542 pages
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Page 112 - ... found nowhere else ; there is even a difference between the inhabitants of the different islands ; yet all show a marked relationship with those of America, though separated from that continent by an open space of ocean between 500 and 600 miles in width.
Page 95 - Anyhow, we may feel sure, that at some former epoch the climate and productions of Ascension were very different from what they now are. Where on the face of the earth can we find a spot, on which close investigation will not discover signs of that endless cycle of change, to which this earth has been, is, and will be subjected?
Page 35 - Sby.). Animal with unequal siphons, clothed with numerous filaments, foot narrow and slender. Shell sub-orbicular, sub-equivalve, and inequilateral, thin, transparent, slightly nacreous within; valves closed, surface granulated ; teeth, in right valve, a short but strong cardinal, and in the left a minute triangular cardinal and a ridge-like lateral on the posterior side. Distribution, 10 species. Britain, Scandinavia, Mediterranean, Tropical America. Fossil, 13 species.
Page 19 - Shell ovate circular or subquadrate, convex or plano-convex. Ventral valve with a false area, which is sometimes minute and usually grooved for the passage of the peduncle. Dorsal valve either with or without an area. Muscular impressions in the ventral valve four ; one pair in front of the beak near the middle or in the upper half of the shell, and the others situated one on each side near the cardinal edge. Shell calcareous ; surface concentrically striated, sometimes with thin extended lamellose...
Page 283 - ... Animal with a broad creeping disk like the limpet ; proboscis armed with cartilaginous jaws, and a long linear tongue; lingual teeth 3 ; median small, laterals large, with dentated hooks; uncini 5, trapezoidal, one of them erect and hooked. No eyes or tentacles. Branchiae forming a series of lamellae between the foot and the mantle, round the posterior part of the body.
Page 188 - He keeps himself chiefly upon the ground, creeping also sometimes into the nets of the fishermen ; but after a storm, as the weather becomes calm, they are seen in troops, floating on the water, being driven up by the agitation of the waves. This sailing, however, is not of long continuance ; for having taken in all their tentacles, they upset their boat, and so return to the bottom.
Page 139 - consisted of a bag of bunting (used for flags) 2 feet deep, the mouth of which was sewn round a wooden hoop 14 inches in diameter ; three pieces of cord, 1 foot long, were secured to the hoop at equal intervals and had their ends tied together. "When in use, the net was towed astern, clear of the ship's wake, by a stout cord secured to one of the quarter-boats, or held in the hand. The scope of the line required was regulated by the speed of the vessel at the time, and the amount of strain caused...
Page 30 - Shell ovate, subelliptical, or subquadrate ; concentrically striated ; hinge of right valve with two cardinal teeth ; the anterior tooth beneath the beaks ; posterior tooth turned obliquely backwards, leaving a triangular pit, which is probably occupied by a tooth in the other valve. Anterior cardinal margin with a long narrow groove, apparently for the reception of a slender projection of the other valve ; posterior side beveled from above, edge thin ; ligament external, in a deep cavity ; muscular...
Page 460 - Shell sub-orbicular, compressed, smooth, or shagreened, a little opened at the ends and longest behind; hinge -teeth 0.1 or 1.1 in front of an angular cartilage notch; lateral teeth 2.2 and 1.1. Animal with the mantle (m) open in front, extending beyond the shell, and bearing a fringe of filaments, of which one in Kg.
Page 96 - It might perhaps have been expected that the examination of the vicinity of the Congo would have thrown some light on the origin, if I may so express myself, of the Flora of St. Helena. This, however, has not proved to be the case ; for neither has a single indigenous species, nor have any of the principal genera, characterising the vegetation of that Island, been found either on the banks of the Congo, or on any other part of this coast of Africa.

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