. Elementary text-book of zoology. Zoology. COPEPOUA. 429 the corresponding thoracic segment may be entirely absent. The abdomen as well as the thorax consists of five segments, but is with- out appendages and ends in a caudal fork, the branches of which are furnished at their points with several long caudal seta? (fig. 339). In the femalf, the two first abdominal segments usually unite to form a double genital segment, on which the genital openings are placed. The abdomen, especially in the parasitic forms, very fre- quently undergoes a considerable FIG. 339.—Female of Cyclops cor
. Elementary text-book of zoology. Zoology. COPEPOUA. 429 the corresponding thoracic segment may be entirely absent. The abdomen as well as the thorax consists of five segments, but is with- out appendages and ends in a caudal fork, the branches of which are furnished at their points with several long caudal seta? (fig. 339). In the femalf, the two first abdominal segments usually unite to form a double genital segment, on which the genital openings are placed. The abdomen, especially in the parasitic forms, very fre- quently undergoes a considerable FIG. 339.—Female of Cyclops corona tin, seen FIG. 310.—An antenna of the male of from the dorsal surface. D, intestine ; OcS, Cyclops serrnlatiis. Sp, olfactory hairs . ovisacs ; A', A1', antenna1. M, muscles. The anterior antenna?, which are usually, many-jointed, bear olfac- tory hairs, but serve in the free-swimming forms for locomotion, and in the male as prehensile arms for catching and holding the female dining copulation (fig. 340). The posterior antenna* are always shorter, and not unfrequeiitly bifurcated and adapted for clinging to surrounding objects. With regard to the oral appendages. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
