Fig. 13 in Patterns of drilling predation of cassid gastropods preying on echinoids from the middle Miocene of Poland

Fig. 13. Distribution of drill holes within the particular sectors of the tests of Echinocyamus linearis (A), Echinocyamus pusillus (B), and Echinocyamus pseudopusillus (C); Fq, relative frequency of drill holes. E. linearis and E. pusillus collected from the coarse−grained Heterostegina Sands, and E. pseudopusillus from the fine−grained Heterostegina Sands. Fq for particular sectors computed from the formulas presented in Table 2, the numbers of formulas in Table 2 correspond to the numbers attributed here to the particular sectors. Confidence intervals computed from the formulas presented in captions to Fig. 9; abor. − (pet. + ap. dsc.), aboral side of test excluding petals and apical disc.