Identifier: microscopeitsrev1856carp (find matches)
Title: The microscope and its revelations
Year: 1856 (1850s)
Authors: Carpenter, William Benjamin, 1813-1885
Subjects: Microscopy Microscopes Microscopy
Publisher: London : John Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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give ourfirst attention to these, afterwards noticing such points in thestructure of the larger kinds, as are likely to be of generalinterest. 365. One of the most curious examples of the reduction ofan elevated type to its very simplest form, which the AnimalKingdom affords, is presented by the group of TycnogonidcB ;some members of which may be found by attentive search inalmost every locality where sea-weeds abound, it being theirhabit to crawl (or rather to sprawl) over the sm-faces of these,and probably to imbibe as food the gelatinous substance withwhich they are invested. The general form of their bodies(Pig. 275) usually reminds us of that of some of the long-legged Crabs; the abdomen being almost or altogether PTCXOGONID^. 631 deficient, whilst the head is very small, and fused (as it were)into the thorax; so that the last-named region, with themembers attached to it, constitutes nearly the whole bulk ofthe animal. The head is extended in front into a proboscis- Fi&. 275.
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Ammofhea pycnogonoides :—a, narrow oesophagus; h, stomach;c, intestine; d, digestive casca of the feet-jaws ; e, e, digestive caecaof the legs. like projection, at the extremity of which is the narrow orificeof the mouth; which seems to be furnished with vibratilecilia, that serve to draw into it the semi-fluid aliDient. Insteadof being furnished (as in the higher Crustaceans) with twopaii-s of antennse and numerous pairs of feet-jaws, it has buta single pair of either; it also bears four minute ocelli, orrudimentary eyes, set at a little distance from each other on asort of tubercle. Erom the thorax proceed four pairs of legs,each composed of several joints, and terminated by a hookedclaw; and by these members the animal drags itself slowly along, 633 CRUSTACEA. instead of walking actively upon them like a crab. Themouth leads to a very narrow oesophagus (a), which passesback to the central stomach (b), situated in the midst of thethorax, from the hinder end of which a narrow intes

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