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Show 1900.] EARTHWORMS OF THE GENUS AMYNTAS. 623 21. Amyntas enganensis Rosa. Perichceta enganensis, Rosa, Ann. Mus. Civ. Genova, (2) xii. p. 546. 170 mm., 140 segments. Stoutish worm. Setae 80 on ix. Spermiducal glands small. Apertures of spermatheca? close together in middle line (2 m m . apart) ; diverticulum longer than spermathecae. Hab. Engano. Of this form, which is obviously near to A. heterochcetus, but different by reason of the close approximation of the spermathecal orifices and of the male pores, Dr. Eosa has described a dark-coloured variety, tetra. 22. Amyntas pictus Mich. Megascolexpictus, Michaelsen, Arch. f. Naturg. 1892, p. 246. Amgntas pictus, id. Jahrb. Hamb. wiss. Anst. xvi. p. 83. 240 mm., 137 segments. Setae slightly larger anteriorly, 66 on v., 79 on xxv. Clitellum xiii.-xviii. Spermiducal glands hardly extend beyond xviii. Diverticula of spermathecae bifid. Hab. Borneo. This species was originally placed in the genus Megascolex on account of tbe slight dorsal gaps in the seta-rows, and, I presume, the form of the spermathecal appendix. The gizzard, however, is like that of Amgntas in position. Another very noteworthy feature in the species is the long clitellum. As only one specimen of this worm has been seen, it is unnecessary to comment at length upon its characteristics. 23. Amyntas dyeri Beddard. Perichceta dyeri, Beddard, P. Z. S. 1892, p. 157. Perichceta sinensis, id. ibid. p. 158. Perichceta monilicystis, Michaelsen, Arch. f. Naturg. 1892, p. 251. Perichceta dyeri, Michaelsen, Abh. Senck. nat. Ges. xxi. p. 230. Perichceta shimaensis, Goto & Hatai, Ann. Zool. Jap. iii. p. 15. 126 mm., 104 segments. Setae larger anteriorly, those setae being ornamented ; 35 on v., 50 on xxi. One or two pairs of large concave genital papillae behind or also in front of male pores. Spermathecae opening very dorsally in position. Diverticulum often moniliform. Hab. Japan, China, West Africa, British Guiana, West Indies, Madagascar, Europe. There is no manner of doubt as to the inclusion of the three species, sinensis, dyeri, and monilicystis, under one head. It was mainly the colour that led me to differentiate the two which bear my authorization. The moniliform diverticulum is not a specific character, but an occasional condition. The existence of one pair of papillae is commoner than two pairs.' I found individuals with only one pair, with two pairs, and some in which there was an asymmetry, only one of the anterior pair being present. The |
