. The Cambridge natural history. Zoology. APPENDAGES OF PHYLLOPODA :5 plates as in Chirocephalus (Fig. 2), or minute vestigial fila- ments as in Aims, in which genns Zaddach, Huxley, and Claus have all failed to find any trace of a second antenna in some females. In the male Branchipodidae the second antennae are modified to form claspers, by which the female is seized, the various degrees of complication which these claspers exhibit affording convenient generic characters. In Branchinecta each second antenna is a thick, three-jointed rod, the last joint forming a claw, while the second joint
. The Cambridge natural history. Zoology. APPENDAGES OF PHYLLOPODA :5 plates as in Chirocephalus (Fig. 2), or minute vestigial fila- ments as in Aims, in which genns Zaddach, Huxley, and Claus have all failed to find any trace of a second antenna in some females. In the male Branchipodidae the second antennae are modified to form claspers, by which the female is seized, the various degrees of complication which these claspers exhibit affording convenient generic characters. In Branchinecta each second antenna is a thick, three-jointed rod, the last joint forming a claw, while the second joint is serrate on its inner margin ; in Branchijms the base is much thickened, and bears on its inner side a large filament (perhaps represented by tlie proxi- mal tubercle of Branchinecta and Artemia), which looks like an extra antenna. In Streptocephalus the terminal joint of the antenna is bifid, and tliere is a basal filament like that of BrancMpus; in Chirocephalus cllaphanus (Figs. 5, 6) the main branch of the antenna consists of two large joints, the terminal joint being a strong claw with a serrated process at its base, while tlie proximal joint bears two appendages on its inner side : one of these is a small, subconical tubercle, the second is more comjdicated, consisting of a main stem and five outgrowths. The main stem is many-jointed and flexible, its basal joint being longer than the others, and bearing on its outer'side a large, triangular, membranous a])pendage, and four soft cylindrical appendages, the main stem and its appendages being ])eset with curious tubercles, ending in short spines, whose structure is not understood. Except during the act of copulation tliis remarkable apparatus is coiled on the inner side of the antennary claw, tlie jointed stem being so coiled that it is often compared to the. Fic. - Chirocephcdus diaphanus. antenna of male, uncoileil. Second. Please note that these images are extracted from scanned page images that may have been digit
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Keywords: ., bookauthorsh, bookcentury1800, bookdecade1890, booksubjectzoology
