. Le bulletin biologique. Biologie ; zoologie ; biologie ; biologie marine. 386 G. J. VERMEIJ ET J. D. CURREY 10 Da ,QTm Force/kN 10,1 X. 0,11050 g/masse FIGURE 2. Espèce caractérisée par les médianes de la charge et de la masse. Lignes ondulées inscrivez-vous des médianes de collections faites à des sites distants. Ab-Acanthina Ac-Acanthina brevidentata ; calcar ; C-Cymia tectum ; da.-Drupa arachnoides ; Dm-Drupa Dr-Drupa ncinus morum ; ; Da-Drttpclla alata ; M.j-fiscclla Mg-Morula grannlata Morula ;, e-Eilat, g-Guam, Hawaii, h-p-Palaos ; M- uva Morula ; P-Teh-Thais ctwcolata ; Purpura patula ; Tc-Thais Td-Thais dcltoidea ; coronata, c

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 386 G. J. VERMEIJ AND J. D. CURREY 10 Da , QTm Strength/kN 1 0.1 X. 0.1 10 50 Mass/g FIGURE 2. Species characterized by medians of load and of mass. Wavy lines join medians of collections made at greatly distant sites. Ab-Acanthina brevidentata; Ac-Acanthina calcar; C-Cymia tectum; Da.-Drupa arachnoides; Dm-Drupa morum; Dr-Drupa ncinus; Da-Drttpclla alata; M.i-Morula fiscclla; Mg-Morula grannlata, e-Eilat, g-Guam, h-Hawaii, p-Palau; M- Morula uva; P-Purpura patula; Teh-Thais ctwcolata; Tc-Thais coronata; Td-Thais dcltoidea, c-Curac, ao, p-Panama; Th-Thais haemastoma, co-Costa Rica, d-Dakar, g-Ghana, pe-Peru; Thi-Thais hippocastanum; Ik-Thais kiosqniformis; T-T!iais lapillus; Tim-Thais lamellosa; Tm-Thais melones; Tt-Thais triangularis. In Table I species, or populations from different localities, are listed alpha- betically in three groups: all specimens above the dashed line in Figure 1 ; some above and some below; all specimens below the line. Of course, the more speci- mens of a species that are tested, the more likely it is that one or two specimens will stray above or below the line. Figure 2 attempts to demonstrate that this effect is unimportant. Each species is represented by its median value for load and median value for mass. The position of the species medians in relation to the line is seen to accord very well with the proportion of specimens falling above and below the line. From now on we shall call species all of whose shells fall above the line "strong, " those that fall below "weak, " and those that have specimens above and below "intermediate." This is for convenience only, and of course implies no hard and fast distinctions among species in the different categories. All the strong species are tropical. Of the weak species, four are temperate, one is tropical, and one comes from Dakar, which might be considered as temperate. Of the intermediate species,

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