Title: On a New Species of the Genus Haplotaxis ; with some Remarks on the Genital Ducts in the Oligochæta
Abstract: ABSTRACT Amongst the material collected by Mr. Keith Lucas during his biological survey of the New Zealand lakes I find two small worms belonging to the genus Haplotaxis, of Hoffmeister (= Phreoryctes, auctorum), which differ from the two species already known—H. gordioides, from Europe and America, and H. smithi, from New Zealand—in being provided with only a single pair of ovaries and oviducts. For this new species, therefore, I propose the name Haplotaxis heterogyne. Justification for placing the worms in this genus, hitherto characterised by the possession of two pairs of female organs, will be found below.