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Show 378 MR. F. E. BEDDARD ON THE [June 18, as distinct. The statement that the latter form differs from its European ally in the presence of the male pores on segment xvi. (instead of xv.) requires careful verification. The two species of Megascolex recorded by Hutton, although evidently differing from each other, are not sufficiently described to permit of their being recognized. In a later paper (9), Captain Hutton gives a brief epitome of Perrier's memoir upon the Classification of Earthworms (13), and in a footnote states that his Lumbricus uliginosus is probably an Acanthodrilus, and that L. levis and L. campestris are probably referable to the genus Digaster. This paper was unknown to me when I published m y earlier paper upon New-Zealand Earthworms (1). Genus ACANTHODRILUS, Perrier1. Mandane, Kinberg, Ofvers. K. Vetensk.-Akad. 1866, p. 97. Acanthodrilus, Perrier, Nouv. Arch. Mus. t. viii. (1872), p. 85. Earthworms with 8 setae, arranged either in pairs or the individual setse implanted at some distance. Clitellum occupying more or fewer of segments xiii.-xix. Prostomium well developed. Vasa deferentia separate up to their point of opening on xviii.; two pairs of tubular atria (=prostates, auctorum) opening independently of vasa deferentia on to segments xvii. and xix. Penial setse rarely absent (in A. multiporus). Oviducal pores paired upon segment xiv. Testes in x. and xi. Ovaries in xiii. Spermatheca? two (rarely 3, in A. communis) pairs in viii. and ix., always furnished with diverticula. 1. ACANTHODRILUS MULTIPORUS, F. E. B. Acanthodrilus multiporus, F. E. Beddard, P. Z. S. 1885, p. 813. 2. ACANTHODRILUS NOV^E ZELANDICE, F. E. B. Acanthodrilus novee zelandice, F. E. Beddard, ibid. p. 813. 3. ACANTHODRILUS DISSIMILIS, F. E. B. Acanthodrilus dissimilis, F. E. Beddard, ibid. p. 813. 4. ACANTHODRILUS ANNECTENS, F. E. B. Acanthodrilus annectens, F. E. Beddard, Quart. Journ. Micr. Sci. vol. xxix. p. 102. 5. ACANTHODRILUS ANTARCTICUS, n. sp. Prostomium not completely dividing the buccal segment. Setce disposed in 8 longitudinal rows; 1 & 2 are closer together than 3 & 4. Dorsal pores present in all segments after the vith. Clitellum extends over segments xiii.-xvii. 1 Eosa (14), on the grounds of priority, bas reinstated Kinberg's name for this genus, inasmuch as Perrier has shown that Mandane and Acanthodrilus are synonymous. But Vaillant (16) has recently pointed out that Kinberg himself has used the generic name Mandane twice over; it was first used for a genus of marine Annelids. Under these circumstances 1 retain Perrier's name Acanthodrilus. |
