. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. 388 ZOOLOGY without great difficulty. Some interesting aquatic spe- cies of this tribe exist. The legs are of a form adapt- ed for swimming, and are fringed with hairs to crease the resistance ; body is oval or round, some instances, these Water- Mites appear to pass through an inactive or pupa Condi- a? Hydrachna Globulus; 6, magnified; tion during the progress of c, young larva; d, pupa. their metamorphosis; attaching themselves, in this state, to the bodies of aquatic insects. 652. Besides the Acari, which f
. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. 388 ZOOLOGY without great difficulty. Some interesting aquatic spe- cies of this tribe exist. The legs are of a form adapt- ed for swimming, and are fringed with hairs to crease the resistance ; body is oval or round, some instances, these Water- Mites appear to pass through an inactive or pupa Condi- a? Hydrachna Globulus; 6, magnified; tion during the progress of c, young larva; d, pupa. their metamorphosis; attaching themselves, in this state, to the bodies of aquatic insects. 652. Besides the Acari, which form the principal part of this order, there is a curious group which has received the name of Pseudo-Scorpions, owing to their possession of a pair of large claws terminating in forceps, which, like those of the true Scorpions, are formed by an exces- sive development of the organs which in insects are termed palpi. There is also a very curious family, which some naturalists have separated into a distinct order, the Pycno- gonides ; these are distinguished by the absence of all spe- cial respiratory organs, and in their aquatic habits bear a strong resemblance to Crustacea. They are fou nd amongst marine plants, and under stones on the sea-beach. Their motions are remarkably slow, and they are said to live chiefly upon the animals of Bivalve Mollusca. Order II.—Pulmonaria. 653. In this order the respiration is performed by means of air-sacs contained on the under side of the body, and opening externally by stigmata; sometimes these aper- tures are eight in number, four on each side, but some- times four, or even only two. This diminution appears to indicate a gradual elevation in the character of the ap- paratus ; leading us from the diffused condition in which it exists in Insects, to the more concentrated form it pre- sents in higher animals. The Scorpions possess eight C91. Describe the mite Please note that these images are extracted from scanned page images that
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