. The life-history of British serpents and their local distribution in the British isles. Serpents. THE ADDER. 155. larger and qiiiie round, tlie endjryo seen through the covering memlirane lying on the egg surfiiee. The embryos were 'M inrhes long, and, except in size, were much like those of dul)- 10. A dissection a fortnight later shows still more rajiid progress, and hy August lo the emhryos look like young adders for the iirst timi". Even through the egg-membrane the markings could be distin- guished, the egg being the one reproduced here. The in this adder were ag
. The life-history of British serpents and their local distribution in the British isles. Serpents. THE ADDER. 155. larger and qiiiie round, tlie endjryo seen through the covering memlirane lying on the egg surfiiee. The embryos were 'M inrhes long, and, except in size, were much like those of dul)- 10. A dissection a fortnight later shows still more rajiid progress, and hy August lo the emhryos look like young adders for the iirst timi". Even through the egg-membrane the markings could be distin- guished, the egg being the one reproduced here. The in this adder were again ten in number, and it was surprising on measuring them to tind the\' were 5 inches in length. I photographed three of them, with a scale of inches marked on the dish (fig. o7), which gives a very good idea of the size and general appearance. The anterior alidoniinal wall was now completely closed. The ('(.ilour (if the belly surface was still whitish, Ijut tlie division where each scale was to appear was evident. The colour shaded off into grey on the back, and the ni.'irkings were distinct, the zig- zag line and tlie extra, line of patches opposite each point of the zigzag lioth ipiite plainly visible. There is one very interesting detail in connection with the development of the markings winch is seen at this stage. It is this. At the posterior part of the IF AllIlEI!. 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 Leighton, Gerald Rowley, 1868-. Edinburgh, London, W. Blackwood
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectserpent, bookyear1901
