. Carnegie Institution of Washington publication. Hapalocardnus, the Gall-forming Crab, etc. 59 The male is figured in the ventral and dorsaal spects where, though it is so small, it will be seen that none of its organs show any signs of degeneracy. This is so for the internal as well as the external organs. The alimentary canal is apparently quite normal; the buccal append- ages resemble almost exactly those of the female. Yet it will be seen that the reproductive organs reach a remarkable state of development. The opaque white structures which I have referred to above occupy a large part of
. Carnegie Institution of Washington publication. Hapalocardnus, the Gall-forming Crab, etc. 59 The male is figured in the ventral and dorsaal spects where, though it is so small, it will be seen that none of its organs show any signs of degeneracy. This is so for the internal as well as the external organs. The alimentary canal is apparently quite normal; the buccal append- ages resemble almost exactly those of the female. Yet it will be seen that the reproductive organs reach a remarkable state of development. The opaque white structures which I have referred to above occupy a large part of the dorsal surface of the cephalothorax. The fact that they are full of mature spermatozoa leads one to regard them as vesicul* seminales rather than testes and it is difficult to recognise in them the tubular shape of the testes and vasa def erentia of the Deca- poda generally. A noticeable point is that the spermatozoa all lie free in vesicula seminalis and are not contained in spermatophores. The absence of tubular testes at the time of examination is probably due to the fact that the male is short-lived and spermatogenesis is confined to a short period, during which all the germ cells are rapidly used up and enormous numbers of spermatozoa are 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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