Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 COPEPODA. 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 setaj (fig, 339). In the female, the two first abdominal segments usually unite to form a double genital segment, on which the genital openings are placed. The abdomen, espec
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 COPEPODA. 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 setaj (fig, 339). In the female, 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 reduction. Fia. 339.—Female of Cydopi coronaim, seen Fig. 310.—An antenna of the male of from the dorsal surface. V, Intestine ; OvS, Cyclops serruiatus. Sf, olfactory hairs . ovisacs; A', A'', antennae. M, muscles. The anterior antennae, 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 during copulation (fig. 340). The posterior antennse are always shorter, and not unfrequently bifurcated and adapted for clinging to surrounding objects. With regard to the oral appendages
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