This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...in the Hymenoptera. Some of these autennal hairs serve as organs of touch and smell, and possibly for hearing also. I have already called attention to the fact that while the pleopods are stndded with thousands of microscopic glands, these appendages in the male are almost devoid of them. Their occurrence in the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...in the Hymenoptera. Some of these autennal hairs serve as organs of touch and smell, and possibly for hearing also. I have already called attention to the fact that while the pleopods are stndded with thousands of microscopic glands, these appendages in the male are almost devoid of them. Their occurrence in the brachyura, where indeed they were first described by Braun (23), might support the theory that they had, in such cases, a function to perform independent of the production of cement, since it has been shown that the crabs possess a special cement-forming organ in the epithelial lining of the glandular receptaculum seminis. We must theriifore conclnde that in the brachyura the work of the glandular receptaculum seminis is supplemented by that of the pleopodal glands, or that the latter possess another function. On the other hand, Leydig (122) has maintained that there is a close relation between gland cells and sensory cells, the two kinds of cells resembling each other in general structure and in the disposition of the cell contents. He found in the sensory cells of the skin of some vertebrates what seemed to correspond to cuticular secretions in gland cells.1 The gland of the type which we have been considering is undoubtedly a very primitive organ in Arthropods. It has probably been modified to perform different functions, with a minimal change of gross anatomical structure. What the function in every case is we can not for the present say with any degree of certainty. While the question is a puzzling one, it seems to me safer to regard all such structures, wherever they occur, in oesophagus, the intestine, the labrum, pleopods, or outer integument of the body, whether in Decapods, Limulus, or in other forms, where they will doubtless be discovere...
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