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Show 666 DR. A. G. BOURNE ON INDIAN EARTHWORMS. [Dec. 21, PERICHJETA BIVAGINATA, sp. n. This species resembles P. lawsoni in the condition of the clitellum and in having separate oviducal pores. The clitellum extends over somites xiv., xv., xvi., and xvii., but is very slightly marked. The male pores are placed on somite xviii., they are inconspicuous; there are no papillae, although special penial setae are present. The oviducts open separately, very near together, in somite xiv., ventrad of the ventral setae. There are three pairs of spermathecae; these are placed in somites vii., viii., and ix. The spermathecal pores open between somites vi. and vii., vii. and viii., viii. and ix., respectively. Each spermatheca possesses a pair of small diverticula at its base. Nephridia are present in most somites, if not all, and are very large and present rosettes of tubules in certain anterior somites, I think in v., vii., and ix. The nephridiopores I have not observed. The gizzard is situated in somite vi. Intestinal caeca are absent. There are about 56 setae in each somite, which are arranged so as to leave small dorsal and ventral gaps, as in P. lawsoni. The setae are also present on the clitellar somites. There are a pair of small sacs in somite xviii. containing long, thin, curved, ornamented setae, as in P. armata, Beddard l. Each sac contains at least 3 setae. Length 140 millim., circumference 8 m m . ; number of somites 162. Hab. Salem (about 1000 ft.), in wet ground. PERICHJETA (PLEUROCHJETA ?) GRACILIS, sp. n. The clitellum extends over somites xiv., xv., xvi., xvii., and xviii., and is very well marked. The male pores are placed in xviii. ; there are no papillae. The oviducts open separately, very near together, in somite xiv. I think that there are two pairs of spermathecae in somites viii. and ix., respectively, but am a little doubtful about it. The gizzard seemed to be in somite vii., but possibly this is a mistake for vi. There are two pairs of groups of small nephridia opening on the posterior edges of somites vii. and viii., respectively, a little nearer the ventral line than the spermathecal pores, which occur between somites vii. and viii., and viii. and ix., respectively. I have not ascertained the number of setae per somite, but there are large dorsal and ventral gaps. I have found no specially modified genital setae. Length 400 millim., circumference 8 mm.; number of somites 332. Hab. Naduvatam, at an elevation of about 6000 feet, in very wet ground. I only obtained a single specimen of this very interesting worm, for which I shall make a special search on a future occasion. 1 Ann. & Mag. Nat. Hist., Oct. 1883, p. 217. |