. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 438 Bulletin Museum of Comparative Zoology, Vol. 138, No. 7 O < a: O a: 3 <. SIZE Figure 8. Apertural form ratio vs. shell size for all measured specimens of the Government Quarry sample of P. bermudens/s zonatus. Consult text for interpretation of regression and circled points. Dotted line separates specimens of five whorls or more from specimens of smaller whorl number. The factor analysis described in text considered only those specimens reaching five whorls. ii) Color measures sort as a discrete cluster.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 438 Bulletin Museum of Comparative Zoology, Vol. 138, No. 7 O < a: O a: 3 <. SIZE Figure 8. Apertural form ratio vs. shell size for all measured specimens of the Government Quarry sample of P. bermudens/s zonatus. Consult text for interpretation of regression and circled points. Dotted line separates specimens of five whorls or more from specimens of smaller whorl number. The factor analysis described in text considered only those specimens reaching five whorls. ii) Color measures sort as a discrete cluster. C) Hierarchy of Interdependence: Successive Reduction of Axes The 8-axis scheme is a horizontal transect through a hierarchical structure of inter- relationships. It displays a set of groupings at a pre-set level of resolution but gives little infonnation on the relative indepen- dence of clusters. Taking non-standardized variables, for example, we find that size exerts a controlling influence. A most important facet of the search for expla- nation involves a vertical question not answered in a single analysis: What is the hierarchy of size dependence? What groups of non-standardized variables are most strongly size-independent and why? "Most structures tend to contribute to total bod\' size by increasing in dimensions during ontogeny. It is of interest to determine whether this influence is dominant, oxer- shadowing the effects of function and other possible factors" (Olson and Miller, 1958:86). The authors of this passage have used their techniques of "morphological integration" to approach such questions. By successiveK' lowering the level of correlation defining basic groups, clusters which were discrete at higher levels merge in gradual sequence. In the frog Rami pipiens, for example, fore- limb and hindlimb complexes are separate at the highest level used; at lower levels these unite to form a single association of locomotory measures. The vertical di
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