. Studies on marine ostracods : pt. 1, Cypridinids, halocyprids and polycopids. Vi- XIII. — DiagramsIhu waliM. (!• 1 lowingni H llii inrlnciui, \\(;k. 111 till i-isisUuu of Slndies on marino Ostrncods 115 in winter is also explained in this way. „ln summer these animals swim, as Woltehkckpoints out, p. 505, „in warm water and when abundantly fed they have swift and energeticnatatory strokes; in cold water and with less intensity of assimilation in winter they swim ,athalf speed and consequently need longer steering Fig. XIV. — The factors of the direction of motion in liic l
. Studies on marine ostracods : pt. 1, Cypridinids, halocyprids and polycopids. Vi- XIII. — DiagramsIhu waliM. (!• 1 lowingni H llii inrlnciui, \\(;k. 111 till i-isisUuu of Slndies on marino Ostrncods 115 in winter is also explained in this way. „ln summer these animals swim, as Woltehkckpoints out, p. 505, „in warm water and when abundantly fed they have swift and energeticnatatory strokes; in cold water and with less intensity of assimilation in winter they swim ,athalf speed and consequently need longer steering Fig. XIV. — The factors of the direction of motion in liic liigli-crested Ili/alodaphnia (Reproduction of fiy:. 28 in R. Wolterkcks work of 1913). a) „Effect of .self-motion (direction B) and deviation due to gravitation (direction G). The resultant of the parallelogram of forces is the direction of motion B. G. b) „The total effect of the propelling force, the twisting of the axis, the resistance of the water, the spina and thecrest. The dotted arrows show the displacement of the points G 1—4, when the head is pressed up about as muchas the width of an eye. In this cases the spina acts as a ventral rudder pressing down the head. When, on the otherhand, the head is pressed just as much down in the natatory movement (fig. XI: 2), the spina is raised to the sameextent and then has a lifting effect on the head (dorsal rudder); it is thus here, on account of its position in thedirection of the motion, a typical stability surface. The body always acts aS a ventral rudder because of
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectostraco, bookyear1920
