. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 528 G. M. WELLINGTON AND A. M. KURIS 25 E 20 H I CD LU I LU 01 CL CO 15 12 10 9 8 Purpura pansa. Purpura pansa P. columellaris 6 7 8 9 10 OLD SPIRE HEIGHT (mm) 20 FIGURE 6. Relationship between log old spire height and log spire height (see text for definitions) of 20 shells identified as Purpura pansa (open circles) and P. columellaris (closed circles) on the basis of apertural morphology. The regression line was fitted to the data for P. pansa only to show the relative increase in spire height of P. columellaris following
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 528 G. M. WELLINGTON AND A. M. KURIS 25 E 20 H I CD LU I LU 01 CL CO 15 12 10 9 8 Purpura pansa. Purpura pansa P. columellaris 6 7 8 9 10 OLD SPIRE HEIGHT (mm) 20 FIGURE 6. Relationship between log old spire height and log spire height (see text for definitions) of 20 shells identified as Purpura pansa (open circles) and P. columellaris (closed circles) on the basis of apertural morphology. The regression line was fitted to the data for P. pansa only to show the relative increase in spire height of P. columellaris following the growth of one-half of a body whorl. misclassification. Such was reflected by a low probability (<.05) of being located as far as they were from either centroid. By this criterion, 48% of the intermediate shells could not be reliably classified. TABLE IV Discriminant functions analysis classification oj shells following assignment of shell to predicted shell groups on the basis of apertural teeth and lip thickness Percentage of shells misclassified as a priori DFA classification Percentage of shells correctly classified P I C 1 P 99 1 C 100 0 — — ungrouped I* — 58 42 2 P 87 — 12 1 I 79 13 8 C 92 0 8 — 3 P + If 93 — — 7 C 98 (2) — 4 P 97 — (3) C + If 88 12 — — P = Purpura pansa, I = intermediate, C = P. columellaris. * In the first DFA the intermediate shells were not grouped and the classification procedure assigned each shell to either P or C based on their loadings on the discriminant function. t In the third and fourth DFA, intermediate shells were combined with either P or C. Numbers in parentheses refer to the percentage of shells misclassified into the combined 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 Marine Biological Laboratory (Woods Hole, Mass. ); Mar
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