The Types of the Species of Ascaris described by Baird

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Abstract
Eight forms, referred to the genus Ascaris, were described by Dr W. Baird between 1853 and 1868, all of which are represented by type-specimens in the British Museum collection. Stossich, in his monograph of the genus Ascaris (1896), mentions six of them, but all these are regarded by him as species inquirendae. Baird's descriptions are in all cases brief, and confined almost entirely to external features, this rendering them inadequate for the requirements of present-day systematic workers. I have, therefore, thought it advisable to undertake a revision of the various types, with a view to deciding more definitely their systematic value, and, where possible, to re-describe those which appeared to me to represent valid species.

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