SYNOPSIS
An account is given of the formation of the mating plug in the atrium of newly mated females of Anopheles from genital secretions of the male and female. The function of these secretions, and of the mating plug, is discussed.
The process of egg collar formation by naticid whelks is described in detail, with an account of the structure of the egg masses of nine species of Naticidae. The collars of five American and two European species are described together with three unidentified egg masses recovered from Canadian Atlantic waters. These are compared with the egg masses of other species, previously described in the literature, and a scheme of classification for the egg collars of the Naticidae is presented on the basis of these descriptions and comparisons.
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