Sinossi
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. 1916 Excerpt: ...that they are not absolutely separated and independent. Table 90.--Partula otaheitana rubescens, Tuauru Valley. The adult specimens from Ahonu amount to 146, or 49.4 per cent of the whole full-grown otaheitana population. They are readily separated into the two principal color-classes, of which the yellow predominates. Of the examples figured belonging to the yellow class (plate 26, figs. 54 to 57), one illustrates the result of decortication (fig. 54); in the case of the red class (plate 26, figs. 58 to 63), decortication changes the color to a pinkish tinge (plate 26, fig. 58). The examples show at a glance that the shells of this colony are larger than those of Tuauru, and also that the second color-type displays a clearer red. The colonial statistics (table 91) are sufficient to give a basis for a full comparison of the two classes. It appears that the yellow shells are larger than the red ones, to a significant degree in shell length, aperture length, and perhaps in the width of the aperture; there are also significant differences in the proportions of the shell as a whole and of the aperture. In brief, the red shells, in general, are smaller and more closely coiled--a fact to be borne in mind when similar classes of the succeeding valleys are compared in detail. The pillar tooth is remarkably developed in this colony; only in Papenoo is it exceeded (table 92). Table 91.--Partula otaheitana rubescens, Ahonu Valley. Statistical analysis. In spite of the low degree of fecundity (table 92), at least at the time of collection, the statistics of heredity (table 92) are of much interest. Each class produces its own kind in the larger number of instances, but young of the contrasted color also appear. Cases occur among both kinds of adults where two embryonic...
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