The animans and man; an elementary textbook of zoology and human physiology (1911) (14782478324)

Identifier: animansmanelemen00kell (find matches)
Title: The animans and man; an elementary textbook of zoology and human physiology
Year: 1911 (1910s)
Authors: Kellogg, Vernon L. (Vernon Lyman), 1867-1937 McCracken, Mary Isabel
Subjects: Zoology Physiology
Publisher: New York, H. Holt and company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library



Text Appearing Before Image:
FIG. 71. a Mayfly, showing (g) Butterfly» is a detailed account of the ^^ butterfly. Comstocks How . ., ,, to Know the Butterflies and Holland sThe Butterfly Book, are finely illus-trated manuals of butterfly classification. tracheal gills (Threetimes natural size; alterJenkins and Kellogg.) Scorpions, spiders, mites, and ticks (class Arachnida).— The class Arachnida is composed of Arthropods whose body-segments are grouped into two regions, a cephalothorax bear-ing the mouth-parts, eyes, and legs, and an abdomen. The ARTHROPODS AND MOLLUSCS
Text Appearing After Image:
FIG. 72. Swallow-tail butterflies, Papilio rutulus. (One-half natural size; drawn from life.) 164 THE ANIMALS AND MAN segments composing each of these two parts are so fused that,except in the scorpions, they are usually indistinguishable.There are no antennae, the eyes are simple, the mouth-partsfitted for biting, and there are four pairs of legs. In theirinternal anatomy the arachnids show in some forms a peculiarmodification of the respiratory organs, the tracheae beingflat and leaf-like and massed together in a few groups ratherthan being tubular and ramifying through the body. The dorsal vessel or heart usuallyhas a few blood-vessels or arteriesrunning from it. This class is divid-ed into three orders, the Arthrogastra,or scorpions, the Acarina, or mitesand ticks, and the Araneina, orspiders. The scorpions (fig. 73) have theposterior six segments of the abdo-men much narrower than the sevenanterior segments and forming a tailwhich bears at its tip a poison-fangor sting. This stin