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Show 1900.] EARTHWORMS OF THE GENUS AMYNTAS. 639 74. Amyntas nanus Rosa. Perichceta nana, Rosa, Ann. Mus. Civ. Genova, (2) xvi. p. 519. 30 mm., 95 segments. Setae with slight dorsal and ventral gaps, 36 on xii., 32 on xxv. 6 seta? between male pores. Dorsal pores from vii./viii. Spermiducal glands in xvii.-xxi., with slightly bent duct. Diverticulum longer than spermatheca. Hab. Sumatra. L. Spermatheca? numerous in vi., vii. 75. Amyntas stelleri Mich. Perichceta stelleri, Michaelsen, Jahrb. Hamb. wiss. Anst. viii. p. 337. Perichceta barami, Michaelsen, Abh. Senck. nat. Ges. xxiii p. 203. Perichceta stelleri, Horst, Notes Leyd. Mus. xx. p. 205 ; Michaelsen, Abh. Senck. nat. Ges. xxiii. p. 202. Perichceta everetti, P. papillata, P. sarawacensis, P. kinabaluensis Beddard, M o n . Olig. p. 428. Perichceta everetti, P. papillata, P. sarawacensis, P. kinabaluensis, Beddard & Fedarb, Ann. Nat. Hist. (6) xvi. p. 69 etc. Amyntas stelleri, Michaelsen, Jahrb. Hamb. wiss. Anst. xvi. p. 36. 115-300 mm., 160 segments. Seta? with slight dorsal gaps, those of anterior segments stronger, 42 on v., 55 on xxiv. Paired papillae to some or all of xix.-xxx. N o caeca. Sperm-sacs in x.-xiii. Spermathecae 2-20 pairs. Hab. Celebes, Sangir, Borneo. The question of the identity or the non-identity of the various species here grouped together in deference with the arrangement of Drs. Horst and Michaelsen does not appear to m e to be quite settled. Horst found that in numerous examples studied by him the number of papillae ranged in number from a single pair through two, three, four, five, eight, nine, and ten pairs, there being occasionally an asymmetry. This seems to dispose of at any rate one alleged specific difference between the four species described by myself and stelleri of Michaelsen. A renewed study of m y own material and the dissection of many more individuals than those which formed the basis of m y original description, has led to the following results. In 32 individuals from Merabah there were never more than two pairs of papillae upon segments xix., xx. Occasionally an asymmetry showed itself, there being only one of one pair present and occasionally papillae were totally absent. In all of these same specimens the spermatheca? were small in number, not more than two in segment vi. and not more than four pairs in segment vii. The sperm-sacs of this series are four pairs in x.-xiii. The last 42* |