. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. '772X Fig. 24.—Mouth of the Horse-fly (Tabanus lin- eola): a, antennae; m, mandibles; mx, max- illae; mp, maxillary palpi; lb, labrum; 7, labium, or tongue. As most of the Arachnids live by suc- tion, the jaws are seldom used for masti- cation. In the Scorpion, the apparent representatives of the mandibles of an Insect are transformed into a pair of small forceps, and the palpi, so small in Insects, are developed into formidable claws: both of these organs
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. '772X Fig. 24.—Mouth of the Horse-fly (Tabanus lin- eola): a, antennae; m, mandibles; mx, max- illae; mp, maxillary palpi; lb, labrum; 7, labium, or tongue. As most of the Arachnids live by suc- tion, the jaws are seldom used for masti- cation. In the Scorpion, the apparent representatives of the mandibles of an Insect are transformed into a pair of small forceps, and the palpi, so small in Insects, are developed into formidable claws: both of these organs are prehen- sile. In Spiders, the so-called mandi- bles, which move more or less vertically, end in a fang; and the club-like palpi, often resembling legs, have nothing to do wTith inges- tion or locomotion. Both Scorpions and Spiders have a soft upper lip, and a groove within the mouth, which serves as a canal while sucking their prey. The tongue is external, and situated between a pair of diminutive maxillae. In the Ascidians the first part of the alimentary canal is enormously enlarged and modified to serve as a gill- sac. At the bottom of this sac, and far removed from its external opening, lies the entrance to the diges- tive tract proper. Into it the particles Of food enter- FlG. Surface of Male Spider: a, in£ with the water are con- Cj p°isou-fans; &> teet» » interior mar- ° # gin of mandible, e; /, labium; g, thorax; Veyed (Fig. 279). h limbs; i, abdomen; Z, spinnerets; m, , n -r-r- maxillary palpus; dilated terminal I he mouth of Verte- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
