. A manual of zoology. Zoology. 400 ARTHROrODA The description may he completed by saying; that tlie straight alimentary canal ij> and d) bears oniv salivary glands (sp); that it is accompanied throughout by a dorsal heart; that the gonads (the sexes are separate) open just in front of the anus i^c), their ducts being modified nephridia. The animals are vivipar- ous, li\e in decaving wood, hide by day and hunt their prey at night. The several species have a wide but discontinuous distribution (South America, Cape of Good Hope, New Zealand, etc.), an indication of great antiquity. Recently t
. A manual of zoology. Zoology. 400 ARTHROrODA The description may he completed by saying; that tlie straight alimentary canal ij> and d) bears oniv salivary glands (sp); that it is accompanied throughout by a dorsal heart; that the gonads (the sexes are separate) open just in front of the anus i^c), their ducts being modified nephridia. The animals are vivipar- ous, li\e in decaving wood, hide by day and hunt their prey at night. The several species have a wide but discontinuous distribution (South America, Cape of Good Hope, New Zealand, etc.), an indication of great antiquity. Recently the forms ha\e been dixided into se\eral genera, Pfripaliis. Pcn'palopsis, Opislhopalus, Fig. 436.—Anatomy of female Fcn'palns opened dorsally (from figures of Afosoloy and Balfour), a, anus; al, antenna'; bin, ventral nerve cords; (/, digestive tract; go, genital opening; 0, ovary; og, brain; p, ; sJ, slime gland; so, nephridia; sp, salivary gland; Ir, traehex; 11, uterus. Class IV. Insecta. The Insecta is a disliiict group marked off from all otl\er arthropods by several important characters. The appendages show no signs of a schizopodal condition. The head is always a distinct region, bearing a single pair of antenna\ a pair of mandibles, and two pairs of maxilkv, the posterior pair often being fused into a lower lip or 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
