Zöology; a textbook for colleges and universities . Photograph by W. P. Bay FlG. 74. Photograph of two sea spiders or pycnogonids. The fragment of coralover which they are crawling is incrusted with bryozoans; about natural size. 262 ZOOLOGY distinct abdominal segments,as the older fossils distinctlyshow. A very few Asiaticspecies still have this characterfairly well developed, at leaston the upper surface. The mites, though mostlyvery small, include the ticks,some of which are as large aspeas, or even larger. Althoughthe arachnids have nearly al-ways four pairs of legs, wherebythey differ at
Zöology; a textbook for colleges and universities . Photograph by W. P. Bay FlG. 74. Photograph of two sea spiders or pycnogonids. The fragment of coralover which they are crawling is incrusted with bryozoans; about natural size. 262 ZOOLOGY distinct abdominal segments,as the older fossils distinctlyshow. A very few Asiaticspecies still have this characterfairly well developed, at leaston the upper surface. The mites, though mostlyvery small, include the ticks,some of which are as large aspeas, or even larger. Althoughthe arachnids have nearly al-ways four pairs of legs, wherebythey differ at once from the in-sects, which have only three, FIG. 75. A scorpion (natural size). .1 n •, i .1 i the gall mites have the legs re-duced to two pairs. The simple eyes (usually eight)of the spiders contrast with the large compound eyes of.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
