 | 1867 - 570 páginas
...acquired a light yellowish coloring, are extremely well defined. Up to this time we have still no trace of feet, bristles, or appendages of any sort, except...worm were the larva of some Nemertes-like animal, notwithstanding the different development of Nemerteans observed by Müller,* Busch,f Gegenbaur,| Krohu,§... | |
 | 1867 - 576 páginas
...acquired a light yellowish coloring, are extremely well defined. Up to this time we have still no trace of feet, bristles, or appendages of any sort, except...worm were the larva of some Nemertes-like animal, notwithstanding the different development of Nemerteans observed by Miiller,* Busch,f Gegenbaur,| Krohu,§... | |
 | 1875 - 694 páginas
...175, with the ciliated crown, the small short tentacles and eyes. The worm now swims about slowl3' and creeps over the bottom, and is nearly a quarter...observed that the larva differs from those of other Annelidcs, as Mr. Agassiz states, in the absence of " feet, bristles or appendages of any sort, except... | |
 | 1875 - 698 páginas
...mouth." The worm now greatly elongates, more segments are added and it appears as in Figs. 174 and 175, with the ciliated crown, the small short tentacles...were the larva of some Nemertes-like animal." Fig. 176 represents the worm over four months after the stage represented by Fig. 175, the articulations... | |
 | 1875 - 692 páginas
...elongates, more segments are added and it appears as in Figs. 174 and 175, with the ciliated erown, the small short tentacles and eyes. The worm now swims...and, were it not for these, it would seem as if the j'oung worm were the larva of some Nemertes-like animal." Fig. 176 represents the worm over four months... | |
 | 1875 - 692 páginas
...elongates, more segments are added and it appears as in Figs. 174 and 175, with the ciliated erown, the small short tentacles and eyes. The worm now swims...and, were it not for these, it would seem as if the j'oung worm were the larva of some Nemertes-like animal." Fig. 176 represents the worm over four months... | |
 | Alpheus Spring Packard - 1876 - 252 páginas
...145, with the ciliated crown, the small short tentacles and e}<es. The worm now swims about slowl}T and creeps over the bottom, and is nearly a quarter...Annelides, as Mr. Agassiz states, in the absence of u feet, bristles or appendages of any sort, except the two tentacles of the head ; and, were it not... | |
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The worm now greatly elongates, more segments are added and it appears as in Figs. 174 and 175, with the ciliated crown, the small short tentacles and eyes. The worm now swims about slowly and creeps over the bottom, and is nearly a quarter of an inch... 