. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. THE PELAGIAL 227 only a small excess of weight in this manner and it is especially effec- tive only for small animals, which have an intrinsically high value of the surface-weight proportion. The simplest means of enlarging the ventral surface lies in the flattening of the body. Leptodiscus, the light- producing flagellate, most Hydromedusae and Scyphomedusae, the turbellarian Haplodiscus, the pelagic nemertines, the cru
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. THE PELAGIAL 227 only a small excess of weight in this manner and it is especially effec- tive only for small animals, which have an intrinsically high value of the surface-weight proportion. The simplest means of enlarging the ventral surface lies in the flattening of the body. Leptodiscus, the light- producing flagellate, most Hydromedusae and Scyphomedusae, the turbellarian Haplodiscus, the pelagic nemertines, the crustacean larva. Fig. 51 Fig. 52 Fig. 51.—Hastigerina digitata, a pelagic foraminifer. After Rhumbler. Fig. 52.—Globigerina bulloides, a pelagic foraminifer. After Ziegler. Phyllosoma (Fig. 53d), the copepod Sapphirina, and many others are thus flattened. Lateral projections, which may be branched in addi- tion, often occur. Such apparatus is most developed among the radio- larians and Foraminifera, in which the long pseudopodia are supple- mented by spines of the test. Such "suspensory bristles" are notable in Hastigerina (Fig. 51) and Globigerina (Fig. 52). This means of support is less developed among the Metazoa; some of the most conspicuous examples, including annelid worms, their larvae, mollusks, crustaceans, and a fish larva, are shown in Fig. 53. Young transformed starfishes and sea urchins (Fig. 54) have relatively long tentacles and. 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 Hesse, Richard, 1868-1944; Allee, W. C. (Warder Clyde), 1885-1955; Schmidt, Karl Patterson, 1890-1957. New York : J. Wiley & Sons, Inc. ; London : Chapman & Hall, Limited
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
