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Show 360 ON AQUATIC OLIGOCHiETOUS W O R M S . [May 3, present species with some allied forms. The table (p. 359) gives some additional facts not referred to in the above description. Also I introduce a few worms not yet fully described, which I have recently been studying. The position of the external apertures of the male reproductive apparatus is, however, rather different from what is found in the genus Acanthodrilus. The accompanying figure (fig. 2) illustrates Fie. 2. Ventral surface of Kerria halophila, to show generative apertures. Sp, Spermatotheeal pores ; od, oviducal pores ; At, atrial pores; Sp.d, spermi-ducal pores. The segments of clitellum are indicated by E o m a n numerals. the arrangement in an individual which was studied by means of longitudinal sections ; I found it impracticable to examine the ventral surface of the entire worm mounted in glycerine, for the reason that in the course of preservation a good deal of the corrosive sublimate used as a fixing reagent had crystallized upon the integument, rendering it therefore very opaque, 'in the sections the setae were seen to be quite unaltered upon the genital segments, they were not even larger than those upon the neighbouring segments. 'The atrial pores, as well as those of the vas deferens, are in close relation to |
