QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by WARING, H. Articles by BRUCE, J. R. Search for Related Content PubMed Articles by WARING, H. Articles by BRUCE, J. R.

Journal of Experimental Biology 18,306-316 (1942)
Published by Company of Biologists 1942

Chromatic Behaviour of Scyllium Canicula

H. WARING ¹, F. W. LANDGREBE ¹, and J. R. BRUCE ¹

¹ Natural History Department, Marischal College, University of Aberdeen

1. Dermal melanophores of intact Scyllium equilibrate at µ=4.9 and µ=1.4 respectively on black and white background with overhead illumination. They equilibrate at µ=2.9 in complete darkness.

2. Normal responses are of the ‘slow’ type.

3. Expanded melanophores in skin strips immersed in saline contract in 30 min. In pituitary extract they expand in 60 min. So we may interpret the slow responses of intact fish as indices of the slow rise and fall of co-ordinating hormones in circulation.

4. The time relations of normal responses are not consistent with a one-hormone hypothesis.

5. Thyroids removed from animals hypophysectomized a month previously afford no evidence for pituitary control of thyroid activity.