. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 202 LECTURES ON aspect of a brace turned the wrong way—thus ?—^—^ ; a very good specific distinction, if no intermediate specimens had been found. A series of deck margins, belonging to this and the following species, will be found represented on plate 8 of the British Association report, figs. 1/., Sg. Fig. 2. The best means of distinguish i n g the species of slipper- limpets from each other was found to be Deck margins of Crepiilula arul
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 202 LECTURES ON aspect of a brace turned the wrong way—thus ?—^—^ ; a very good specific distinction, if no intermediate specimens had been found. A series of deck margins, belonging to this and the following species, will be found represented on plate 8 of the British Association report, figs. 1/., Sg. Fig. 2. The best means of distinguish i n g the species of slipper- limpets from each other was found to be Deck margins of Crepiilula aruleata. The straight line represents the situa- l'U6 Snape 01 ILIB nu- tion of the medial nb. clear portion and the mode of growth of the very young shell. Whatever be the abnormal character of the adult, it did not appear that the offspring had a ten- dency to the same degeneracy, but rather to the resumption of the normal type. In the case of local varieties, the peculiarities are repro- duced, because they depend on circumstances which affect all alike. But in such cases as those under consideration, where the extremes and all the intermediate forms of variation are found in the same local- ity, the changes depending on the accidents of the individual, it is not yet proved that the idiosyncracies are transmitted. In fact, the frequent instances in which the individual itself changes its form and sculp- ture at different periods of its life is against such a hypothesis. In the higher animals, where there is, as it were, an innate vital power shaped according to the species, with an additional power shaped ac- cording to the individual, and these powers are to no slight extent irrespective of the immediate external surroundings, there is a much stronger tendency in the offspring to imitate the parent—as in the black faces of the Southdown sheep, or the stump-tailed cats of the Isle of Man. This tendency on the part of the parent to reproduce itself, and even that particu
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