. Contributions. Biology. No. 526] VARIATIONS IN UROSALPINX 585 Buzzard's Bflf. k ViAjEYflRO Sound Fig. 3. due to the rapid growth and approaching maturity of the young ones. That the ratio of the two dimensions used changes somewhat with age is shown in a later tahle (Table VII), a fact that somewhat complicates a compar- ison between shells of any two localities. It will fur- thermore be observed that the variability of the Vine- yard Soimd shells as indicated by their standard devia- tion increases steadily from July 5 to August 5, reaching its maximum upon the latter date, but that for bot
. Contributions. Biology. No. 526] VARIATIONS IN UROSALPINX 585 Buzzard's Bflf. k ViAjEYflRO Sound Fig. 3. due to the rapid growth and approaching maturity of the young ones. That the ratio of the two dimensions used changes somewhat with age is shown in a later tahle (Table VII), a fact that somewhat complicates a compar- ison between shells of any two localities. It will fur- thermore be observed that the variability of the Vine- yard Soimd shells as indicated by their standard devia- tion increases steadily from July 5 to August 5, reaching its maximum upon the latter date, but that for both the Buzzard's Bay localities the same is not true; on the con- trary, in the case of Penzance Point the August 5 collec- tions showed the least variability of any time. The fact that the maximum of the shifting seasonal variation does not occur at the same time in localities almost within sight of each other, as in the present instance, plainly indicates that comparisons of variabilities based upon the time-factor alone do not take everything into consid- eration. The shells from Buzzard's Bay range in their arithmetical mean from to while those from Vineyard Sound, separated from the former only by the narrow tongue of land on which the village of Woods Hole is located, form a distinct class ranging from to Here is a distinct place difference in the shells of the two general localities in question. Shells obtained from other localities in Buzzard's Bay. 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 Brown University. Biological Laboratory. Providence, R. I
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