. The Australian zoologist. Zoology; Zoology; Zoology. 51. Jig- 2.—Edwardsina australiensis, section through the middle of the third body division (diagrammatic). A cross section through the middle of the body shows that in this larva there are no real lateral appendages, but one may say that they are in the making, as the lateral tips of the large sections take, functionally, the place of these ap- pendages; the ventral faces of these tips are provided with a small and weak oblique depression. The sensory lateral appendages are also completely missing. Each of the main sections of the median
. The Australian zoologist. Zoology; Zoology; Zoology. 51. Jig- 2.—Edwardsina australiensis, section through the middle of the third body division (diagrammatic). A cross section through the middle of the body shows that in this larva there are no real lateral appendages, but one may say that they are in the making, as the lateral tips of the large sections take, functionally, the place of these ap- pendages; the ventral faces of these tips are provided with a small and weak oblique depression. The sensory lateral appendages are also completely missing. Each of the main sections of the median divisions is marked by a few small punctiform depressions; they are disposed in two groups, one pair in the middle, and a series of four or five on each side; above and below the latter a very weak seta is to be found. The anal division of the body is here composed of four sections:—(1) the anterior small section of the seventh abdominal segment, (2) the main section of this segment, which is narrower and with blunter sides than those of the median divisions; it carries also the same punctiform depressions on the dorsum and four little setae on its posterior part, (3) the eighth abdominal segment, not very deeply separated from the preceding one except on the sides where the notch is fairly deep, (4) the last (ninth) segment, oval in shape and forming with the preceding one a rather well shaped ellipse so that the tip of the body is quite rounded. On the ventral face of the body, winch is of the usual whitish colour, each division carries a sucker not differing in any way from those of other species; their size is relatively small. The gill-tufts are composed of five filaments, or tubes, placed on the small anterior segments of the divisions 2 to 6; they are arranged close to one another in a rather regular transverse series. The four anal gills are composed of a median small pair, and of the lateral ones, which are not very much developed; they reach about the level of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1914
