The Publishers regret that the following authors’ corrections were not included in Volume 76 of the Journal of Embryology and Experimental Morphology. It is suggested that this sheet should be affixed to the blank page opposite page 1 of Volume 76.
Regeneration of the eye margin in Periplaneta americana (Insecta, Blattodea) By P. M. J. SHELTON, H.-D. PFANNENSTIEL AND E. WACHMANN
Page 24. Second paragraph should read:-‘The pattern-forming mechanism that allows the regeneration of a proliferation zone also remains obscure but we see no reason why it should not be the same one that.....‘etc.
Development of the lateral line system in Xenopus laevis. I. Normal development and cell movement in the supraorbital system By RUDOLF WINKLBAUER AND PETER HAUSEN
Page 265. Line 9 of the Summary should read:-‘primordium is due to cell multiplication and rearrangement, and not due to changes in cell..... ‘etc.
Page 269. Figure 1. Bar = 100μm.
Page 270. Figure 2. The left-hand upper outline is stage 33/34.
Page 277. First two paragraphs should read:-‘after stage , of the sum of its fragments in direction of its movement is compared with the total area covered by the primordium. Both parameters increase linearly, but the increase in length is greater than the increase in area. Therefore both the growth of the primordium and a decrease in its average width contribute to elongation.
The area occupied per cell (70 μm2, area of primordium divided by cell number) remains constant over the whole period. As the primordium retains the thickness of one cell layer, the increase in area covered by the primordium is given by the rate of increase in cell number and not by an enlargement or change in shape of the primordial cells.’
Page 280. Third and fourth paragraphs should read:-‘The primordium remains a one-cell-thick layer throughout development (unpublished observations). The increase in length of the primordium is accompanied by an increase in the area occupied and a decrease in the average width of the primordium. Since the area occupied per cell remains constant, cell multiplication must occur to account for the increase in area. Cell rearrangement seems to allow for the decrease in width of the primordium, since no definite shape changes of the primordial cells during elongation could be observed.
Obviously all primordial cells have to change ‘etc.