. Animal life as affected by the natural conditions of existence. Animal ecology. EULIMA ON AND IN HOLOTHUEIA. 351 has only led to its losing the organ for gnawing and masticating which is universal and peculiar to univalves. It does not need it, for it seems to suck up the slimy secretion from the skin of the host. Hence Uulima has never been included in the category of true parasites; and rashly dogmatising from this view, the actual observation of Mr. Cuming (the well-known traveller and conchologist), who found similar specimens of Eulima inside the stomach of Holothurians, was at once rej
. Animal life as affected by the natural conditions of existence. Animal ecology. EULIMA ON AND IN HOLOTHUEIA. 351 has only led to its losing the organ for gnawing and masticating which is universal and peculiar to univalves. It does not need it, for it seems to suck up the slimy secretion from the skin of the host. Hence Uulima has never been included in the category of true parasites; and rashly dogmatising from this view, the actual observation of Mr. Cuming (the well-known traveller and conchologist), who found similar specimens of Eulima inside the stomach of Holothurians, was at once rejected and explained away by the quite unfounded assertion that the univalves had only been eaten by the Holothurians; but Cuming was perfectly correct ia his statement, for I myself have found living Eulimse in the intestine of large Holothurise,. Fia. 95.—Two undescribed species of Eulimi. a, lives creeping freely in the stomaoli of a Holothurian. 6 is sessile on the skin of a Holothmdan, tlirough which it plunges its sucking proboscis, c, the front of the proboscis with its simple mouth. and that very often and by no means as a great rarity. Here they creep about rapidly on their broad foot, on the wall of the intestine, and they have, moreover, all the organs proper to univalves, as a nervous system, organs of sensation, an iutes- tinal canal, &c., exactly like the form hviug on the outer skin; the only organ wanting is, in the same way, the masticating organ, rachis or tongue, as it is called. With these, certain small flat worms live in the same intestine ; these have the internal structure of the Trem'atoda, but glide along the intestinal canal after the fashion of the Planarian worms, by means of the cilia on their skin; and, lastly, a few species of minute Crustacea, belonging to the Copepoda, float and crawl within. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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