XXII. The reproduction of the ascaris mystax

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Abstract
Having been led to investigate the mode of generation and development of the Ascaris mystax , I venture to lay before the Royal Society the results of my observations, in the hope that they may not be devoid of interest. The worm in question has been long known to helminthologists (Plate XXV. figs. 3 and 4); it varies from 1 to 3 inches in length, is fusiform, and covered with a striated horny cuticle, which is projected on either side of the head to form the alæ characteristic of the species (fig. 1 a ).

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