. Biological structure and function; proceedings. Biochemistry; Cytology. a mmh Fig. 5. Anal arms (seen from the anal side) in larvae of Psamnucliiinis miliaris in early pluteus stages, a, arm with the typical cluster of mesenchyme attached to and forming the growing skeleton. The extension of the arm rudiment is brought about by the pressure of the mesenchyme cluster. The region between the two arms (right arm outside the picture) shows a pulsatory activity which brings about an invagination, b, the pulsatory activity between the anal arms is supple- mented by the emission of contractile pseu
. Biological structure and function; proceedings. Biochemistry; Cytology. a mmh Fig. 5. Anal arms (seen from the anal side) in larvae of Psamnucliiinis miliaris in early pluteus stages, a, arm with the typical cluster of mesenchyme attached to and forming the growing skeleton. The extension of the arm rudiment is brought about by the pressure of the mesenchyme cluster. The region between the two arms (right arm outside the picture) shows a pulsatory activity which brings about an invagination, b, the pulsatory activity between the anal arms is supple- mented by the emission of contractile pseudopodia which, for example, attach to the skeleton and exert a tension which partly causes a release of the pseudopod- forming ectoderm cells. to depend upon the contractility of the oesophagus. (The expansion of the stomach rudiment into a thin-walled vesicle is also greatly dependent upon a contractility outside the rudiment itself, is brought about by the hydrostatic pressure generated by the contractions of the oesophagus.) The ectoderm may, however, acquire a pulsatory and pseudopodal activity in certain regions, in the regions on the ventral side which early have been in close contact with the ventral clusters of primary mesenchyme. I refer to the invaginating regions between the arm rudiments. The in- vaginations are brought about by pulsatory and pseudopodal activity. Fig. 5, and thus are reminiscent of the invagination of the archenteron rudiment. It may be permitted to suggest that the ectoderm in these. 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 IUB/IUBS International Symposium (1st : 1960 : Stockholm); International Union of Biochemistry; International Union of Biological Sciences; Goodwin, T. W. (Trevor Walworth); Lindberg, Olov, 1914-. London, New York, Academic Press
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