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Updated: May 16, 2025
Among other characters of the molluscous animals, which render them extremely valuable in settling chronological questions in geology, may be mentioned, first, the wide geographical range of many species; and, secondly, what is probably a consequence of the former, the great duration of species in this class, for they appear to have surpassed in longevity the greater number of the mammalia and fish.
Below low-tide level occur beds of molluscous shells, such as the oyster, with countless numbers of other humble organisms.
Judging by the uniformity of climate now prevailing from century to century, and the insensible rate of variation in the geographical distribution of organic beings in our own times, we may presume that an extremely lengthened period was required even for so slight a modification in the range of the molluscous fauna, as that of which the evidence is here brought to light.
A certain something, I believe a vague molluscous form of conscience, made him wriggle and shift uneasily upon his chair as he spoke. 'No, no, said Robert, 'you are not fit to go. Make yourself comfortable, my dear sir. There is no reason why you should go. 'There is something I don't understand about it. I want to go.
Nor are parts of a series less serial, because arranged spirally, as in most gasteropods. Mr. Spencer observes of the molluscous as of the vertebrate animal, "You cannot cut it into transverse slices, each of which contains a digestive organ, a respiratory organ, a reproductive organ, &c."
Finally, and this is perhaps one of the most curious circumstances, the process of formation appears to have been, at least in some respects, the same in the eyes of these molluscous animals as in the eyes of vertebrates.
We can thus, also, understand the general want of that close sequence in fossiliferous formations which we might theoretically have anticipated; for, without we suppose a subsiding movement to go on at the same spot during an enormous period, from one geological era to another, and during the whole of this period sediment to accumulate at the proper rate, so that the depth should not become too great for the continued existence of molluscous animals, it is scarcely possible that there should be a perfect sequence at the same spot in the fossil shells of the two geological formations.
In much the same way atolls may be built on any shoal which lies within the zone of coral growth. Such shoals may be produced when volcanic islands are leveled by waves and ocean currents, and when submarine plateaus, ridges, and peaks are built up by various organic agencies, such as molluscous and foraminiferal shell deposits.
What a good thing it would be if her mother decided to die of course she would, could, never say any such thing to Norie to die and set free Honoria to marry Major Petworth Armstrong! She felt Norie still hankered after him, but perhaps kept him at bay partly because of her mother's molluscous clingings No! she wouldn't even sneer at Lady Fraser.
Its food consists of shrimps, marine insects, fragments of molluscous animals, and the like; but it obtains no nutriment through the sucking-apparatus, nor does it in any way injure the animal to which it adheres. It only makes use of the sucker at intervals; at other times, swimming around the object it attends, and looking out for prey of its own choice, and on its own account.
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