Horae Entomologicae; Or Essays on the Annulose Animals Volume 1-2

Horae Entomologicae; Or Essays on the Annulose Animals Volume 1-2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1821 edition. Excerpt: ...by other arguments; and in the mean time I request it may be understood that it is the disposition of the component parts of the class, and not the limits that may have been affixed to the respective orders, --in short, that it is the chain of affinity, and not the accurate designation of the groups, which I would here propose to entomological notice. Having said thus much to prevent mistake, I may now proceed to state that the general character of the Crustacea as an Annulose class consists in their breathing by means of branchiae, and being in possession of a complete circulation. The blood, after communicating with the surrounding medium, passes into a great ventral vessel, which distributes it over the body, whence it returns to a sort of heart or muscular ventricle situated in the back, by means of which it arrives again at the branchiae. Now, it is manifest that this is the circulation of a Fish, rather than of a Mollusque, the heart of which is always aortal; and this circumstance might be adduced as conclusive evidence that those naturalists, by whom the Mollusca are placed between the Crustacea and Fishes, have not properly applied even their own principles. If they think proper to found their arrangement of animals almost entirely on the system of circulation, we have a right to require of their consistency that two classes, such as Crustacea and Fishes, having similar systems, shall not be separated by five classes of Mollmca which have another system totally distinct. I had before reason to contest the propriety of an application of this principle of comparative anatomists to the arrangement of Annulose animals; and I do not even now regret that they should have chosen to neglect it, since the intervention of the Ametabola between..
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Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236508033
  • 9781236508034