Excerpt from Bulletin of the Museum of Comparative Zo�logy at Harvard College, in Cambridge, 1898-1899, Vol. 32 Clusters of nematocysts are found in the numerous wart-like pro tuberances (figs. 24 and 29, Plates X. And XI.) which are thickly scattered over the exumbrella surface of the disk, the palps, and the tentacles. These protuberances are thickly clustered near the centre of the disk, where they appear as little hemispherical projections above the general surface near the outer edges of the disk, however, they are ...
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Excerpt from Bulletin of the Museum of Comparative Zo�logy at Harvard College, in Cambridge, 1898-1899, Vol. 32 Clusters of nematocysts are found in the numerous wart-like pro tuberances (figs. 24 and 29, Plates X. And XI.) which are thickly scattered over the exumbrella surface of the disk, the palps, and the tentacles. These protuberances are thickly clustered near the centre of the disk, where they appear as little hemispherical projections above the general surface near the outer edges of the disk, however, they are elongate in' shape, and at the extreme edge they are again hemispherical (see Figs. 19, 26, 28, and If a weak solution of picric acid in 50% alcohol is allowed to permeate the sea water in which the medusa is living the nematocysts are exploded with great energy. Ordinarily they then present the appearance shown in Figure 21, Plate IX., but occasionally one finds one resembling that shown in Figure 22, where the main shaft of the thread is tightly coiled in a right-handed helix, and a small ellipsoidal mass of protoplasm (p) is borne upon the free extremity. It is very difficult to imagine how such a thread could be turned outward in the ordinary manner, and it is probable that the extreme stimulation caused by the picric acid produced an abnormal discharge of the nematocysts. The nematocysts which exhibited this peculiar structure were invariably immature in development, and were only about one tenth as numerous as the ordinary normal ones. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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