Smithsonian miscellaneous collections . FiG. 3.—a, first antenna of a male Arcnosctclla spinicatida, withtwo large aesthetasks; b, first antenna of a male Nitocra chclifer,with a single long and stout aesthetask; c, first antenna of a maleEnicrtoiiia gracilis, with a single enlarged Fig. 4.—First antenna of Arenocalanus tuiiiidtis, female, a newgenus of sand-dwelling calanids, showing an exceptional increasein the number of aesthetasks. ally carries a single sensory club or aesthetask on each of the firstantennae. In these terraqueous copepods the size and length of theaesthetasks
Smithsonian miscellaneous collections . FiG. 3.—a, first antenna of a male Arcnosctclla spinicatida, withtwo large aesthetasks; b, first antenna of a male Nitocra chclifer,with a single long and stout aesthetask; c, first antenna of a maleEnicrtoiiia gracilis, with a single enlarged Fig. 4.—First antenna of Arenocalanus tuiiiidtis, female, a newgenus of sand-dwelling calanids, showing an exceptional increasein the number of aesthetasks. ally carries a single sensory club or aesthetask on each of the firstantennae. In these terraqueous copepods the size and length of theaesthetasks may be considerably increased, as happens more oftenin the males (fig. 3). In the females either the number of aesthetasksis multiplied as in figure 4, or they are supplemented by thick finger- 8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 like processes, carrying along one or both sides a row of coarse spinesas in figure 5. There are sometimes six or eight such processes on eachantenna, projecting in all directions and giving the appendage a de-cidely bizarre appearance. Nothing of this sort has ever been reportedupon free-swimming copepods, and hence it may be regarded as aspecial modification for a special mode of life. Furthermore, the firstantennae are short and curve around th
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
