. F7 100 Fig. 14. The paths of development of one hundred fourth furcilias calculated from the percentages of fourth furcilias moulting to fifth or sixth furciUas and the percentages of fifth furcilias moulting to sixth or seventh furcilias (see Table 8). The figures show the arrangements of the spines on the telson in each stage and it can be seen how the number of terminal spines in the succeeding stage is determined. Although it is now accepted that, within one species, larvae with certain combinations of setose and non-setose pleopods tend to be dominant and that the few other combinations
. F7 100 Fig. 14. The paths of development of one hundred fourth furcilias calculated from the percentages of fourth furcilias moulting to fifth or sixth furciUas and the percentages of fifth furcilias moulting to sixth or seventh furcilias (see Table 8). The figures show the arrangements of the spines on the telson in each stage and it can be seen how the number of terminal spines in the succeeding stage is determined. Although it is now accepted that, within one species, larvae with certain combinations of setose and non-setose pleopods tend to be dominant and that the few other combinations that occur can be considered as variants, it is unusual for any of the furcilias which are recognized by the number of terminal spines on the telson, to be omitted. This point is emphasized by Boden (1955, p. 375) who,
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