Observations on certain helminths of man

Abstract
The remarks embodied in the present paper were intended primarily as a running commentary upon a series of macroscopical and microscopical preparations demonstrated before the Society. So far as has been feasible these preparations have been drawn with the camera lucida. The sketches, mostly in outline, are given to illustrate the morphological details in the text. These details often refer to apparently insignificant points, but in practically every case the proper determination of the species is involved. We are still far from attaining a clear and accurate knowledge of the structure even of some of the commoner parasites. The absence of certain features has so often been unjustifiably used as a feature distinguishing forms from one part of the world, or in one host, from apparently similar forms in another that much confusion reigns—cf. in the species Filaria bancrofti and Opisthorchis noverea. It is feared that the new morphological features now announced may add to rather than lessen this confusion : at least for a time.

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