. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 16. Peristome and adjoining part of the test of a young Hemiasier expergiltis, 3'im in length. 25/1. Fig. 17. Apical sjstem of a yo\xw% Hemiasler expergHus, 3""" in length, ^s/,. The outline of the smaller ambulacral plates and of some of the inner interambulacral plates not quite sure. quite pentagonal; the peristomial meml)ranc is full of small somewhat concentrically arranged plates (Fig. 16). In the larger specimens the labrum becomes by and by rather prominent, a l
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fig. 16. Peristome and adjoining part of the test of a young Hemiasier expergiltis, 3'im in length. 25/1. Fig. 17. Apical sjstem of a yo\xw% Hemiasler expergHus, 3""" in length, ^s/,. The outline of the smaller ambulacral plates and of some of the inner interambulacral plates not quite sure. quite pentagonal; the peristomial meml)ranc is full of small somewhat concentrically arranged plates (Fig. 16). In the larger specimens the labrum becomes by and by rather prominent, a little pointed, with the edge a little thickened and reverted. Its posterior edge reaches, in the smaller specimens, only to the middle of the adjoining ambulacral plates I. a. i and V. b. i (Com]). Loven. PI. ); in somewhat larger .specimens it reaches to the end of the first ambulacral plates, or a little farther on the right side, as in Loven's Figure 114 (and his PI. V. 47), and in the grown specimens it reaches to llie middle or even to the end of the second adjoining amlnilacral jilate on each side (PI. II. ); generalh- the ambulacral plates of \'. 1). arc a little shorter than those of I. a, so that the right side of the labrum appears to reach a little fartlicr than llie kft, l)ul it is really symmetric. In the larger specimens the inner ambulacral plates arc comparativclN mucli smaller than in llie young specnnens, and their outline likewise is different. though it llius looks rather different in the young and grown , no character for eventually dLstinguisliing two species is to be found lierein; it is a difference due only to age, all transitional stages being found in the corresponding intermediate 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 Danish Ingolf-Expedit
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
