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With regard to the specific characters of the species of Zeugopterus nothing is known of peculiarities in mode of life which would give an importance in the struggle for existence to the concrescence of the pelvic fins with the ventral in punctatus, to the absence of this character and the elongation of the first dorsal ray in unimaculatus, or to the absence of both characters in norvegicus.
Apart from this, botanists are generally agreed that the concrescence of parts of the flower-whorls in the gynaeceum as the seed-covering, and in the corolla as the seat of attraction, more than in the androecium and the calyx is an indication of advance, as is also the concrescence that gives the condition of epigyny.
Harvey thought that impregnation influenced the female organism as a contagion; and that the blood, which he conceived to be the first rudiment of the germ, arose in the clear fluid of the "colliquamentum" of the ovum by a process of concrescence, as a sort of living precipitate.
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