OCR Text |
Show 1900.] EARTHWORMS OF THE GENUS AMYNTAS. 613 pore (rarely paired) on xiv. Male pores always separated by some setae, their degree of approximation varying. Genital papillae commonly, but not always, present; they are developed in the neighbourhood of the male pores or spermathecal pores, or both. There are apparently two kinds, which may coexist : sucker-like depressions and projecting or flattened areas of modified epidermis. Septa viii./ix. and ix./x. usually, but not always, missing. Gizzard always in segment viii. No calciferous glands. Intestine commences invariably (?) in xv. Intestine nearly always provided with a pair of forwardly-directed caeca of limited (up to five segments) extent. Caeca occasionally divided into not more than 6 caeca. Typhlosole small. The last heart either in xiii., or, much more rarely, in xii. Nephridia " micronephridia " only. Sperm-sacs usually in xi., xii., sometimes extending to x. & xiii. Sperm-reservoirs always present, enveloping sperm-duct funnels in x., xi. Egg-sacs commonly present in xiii. or xiii., xiv. Spermathecae one to six pairs in some, or all, of segments iv.-ix.; occasionally numerous (2-14) in one, or two, segments. Spermathecae always provided with a diverticulum (in which alone the sperm is stored), to which are rarely appended secondary diverticula. Sperm-ducts open in common with a lobate spermiducal gland which varies in size and is rarely absent. Tbe muscular duct of this gland opens directly on to the exterior or through a terminal dilated sac, which may be provided with an exsertile penis. Penial setae are not present. Glands correspond in many cases to the genital papillae. Distribution. Oriental Eegion, especially Malay Archipelago, but found also (introduced ?) in Australia, Africa, America, Europe. (1) Setce on all segments of clitellum ; gizzard-septa absent; spermiducal gland-duct with terminal bulbus. A. Spermathecae 3 pairs in vii.-ix. 1. Amyntas houlleti Perrier. Perichceta houlleti, Perrier, Nouv. Arch. Mus. viii. p. 99. P. houlleti, Beddard, Ann. Nat. Hist. (5) xvii. p. 93; id. P. Z. S. 1887, p. 389 ; id. Zool. Anz. 1888, p. 91; id. P. Z. S. 1890, p. 61; id. Quart. Journ. Micr. Sci. xxx. p. 459. P. houlleti, Rosa, Ann. R. Accad. Torino, xxix. p. 16 ; id. Ann. Mus. Civ. Genova, (2) xvi. p. 515. P. houlleti, Michaelsen, Abh. Senck. nat. Ges. xxi. p. 234; id. Jahrb. Hamb. wiss. Anst. xvi. p. 12 & p. 92; id. Zool. Jahrb., Abth. f. Syst. xii. p. 139. P. houlleti, Bourne, Journ. Asiat. Soc. Bengal, lviii. p. 110. P. houlleti, Horst in Weber's Zool. Ergebn. ii. p. 64. Megascolex houlleti, Vaillant, Anneles, 1889, p. 75. Perichceta campanulata, Eosa, Ann. Mus. Civ. Genova, (2) x. p. 115. |