. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 497 the shell after it. With Yoldia these movements follow each other in quick succession, and enable an animal to bury itself with great rapidity. With Nucula the movements are not so rapid, but they are very effective. Animals placed on their sides on mud, right themselves without trouble, and quickly disappear. Yoldia executes many move- ments of leaping that Nucula seems never to bg' Fig. 2. Adult specimen of Nucula delphinodonta, represented as seen from the right side. Reconstructed to show internal organs. Fully
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 497 the shell after it. With Yoldia these movements follow each other in quick succession, and enable an animal to bury itself with great rapidity. With Nucula the movements are not so rapid, but they are very effective. Animals placed on their sides on mud, right themselves without trouble, and quickly disappear. Yoldia executes many move- ments of leaping that Nucula seems never to bg' Fig. 2. Adult specimen of Nucula delphinodonta, represented as seen from the right side. Reconstructed to show internal organs. Fully grown specimens are 4 mm long, aa anterior adductor muscle, bg byssal gland, eg cerebral ganglion. / foot. g gill, h heart, int intestine. Ip labial palp, oes oesophagus, ot otocyst. pa posterior adductor muscle, pap palp-appendage, pg pedal ganglion, sto stomach, vg visceral ganglion. Although many specimens have been kept under observation for long periods of time, and although rough and smooth bottomed aquaria, aquaria containing sand, and aquaria containing the mud in which the animals normally live, have been used, no cases of creeping have been observed. N. delphinodonta possesses a very large foot, and the almost spherical shell is easily turned over and thrown about, but the movements of the foot are always such as are used in burrowing. It seems very hard to imagine that the foot could possibly be used as. 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 Anatomische Gesellschaft. Jena : G. Fischer
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