Eine Abhandlung über die malakologie; oder, Muscheln und Schalentiere. hidcp, indem er den ersten Developement ofa zentrale Säule. Lamarcks Beobachtungen, die nach thisinteresting Gruppe, die enthält viele natürliche Sub-Gattungen, erscheinen uns die Eigenschaft der genaue Pro-übersetzungsaktes, fast intuitiv, der natürlichen afl! inities andrelations, die alle seine Schriften vor hisunfortunate Blindheit gekennzeichnet ist, - eine seltene Talent von Diskriminierung, die sich, wie er zu Recht beobachtet, die durch andere, placeshim in dieser Hinsicht weit über das Thema der theRegne Tier. Obwohl er nicht der advantageof kennen Wit,

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A treatise on malacology; or, Shells and shell fish . hidcp, by showing the first developement ofa central pillar. Lamarcks observations upon thisinteresting group, which contains many natural sub-genera, appear to us characteristic of that accurate per-ception, almost intuitive, of natural afl!inities andrelations which characterised all his writings before hisunfortunate blindness, — a rare talent of discrimination, which, as it has been justly observed by others, placeshim, in this respect, far above even the author of theRegne Animal. Although he had not the advantageof being acquainted with the animal, made known tous by the unpublished drawings of Guilding* (ofwhich the annexed cut is a copy, fig. 42.), he con-sidered this genus, not related (by affinity) to Patella, but that its incipient spire and pillar indicated a struc-ture approaching to that of Trochus. He erred, appa-rently, in carrying this theory too far, by supposing * The typical form is probably C. Chinensis, the species here figured. 234 SHELLS AND SHELL-FISH. PART I.. that his C. trocMformis would he hetter placed in thatfamily. But even the errors of such a man are aslights to others; for when douhts exist as to the limitsof a genus, we may be perfectly sure of the passage, and that both genera are natural. On the other hand, if we look to the resemblance between Patella andCalyptrcBa as analogical, these conflicting opinions areat once reconciled : both are cup-shaped, pyramidical, and with the apex almost central; and that both standopposite to each other in their respective circles, theintelligent reader will perceive if he brings these fa-milies into comparison. (217.) The next group, which, from a considerationof the animal, we have here named Cheltnotus, cor-responds, in some measure, to Sigaretus of authors.We find it impossible, however, to understand thisgroup. It has been customary to place in Sigaretusnearly all those ear-shaped shells of the same form asStomatia, but which are not perl

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• bookcentury1800
• bookdecade1840
• booksubjectmollusks
• buchjahr184