424 OLIGOCHAETA 



(53) Perichaeta posthuma, Vaillant. 



p. posthuma, Vaillant, Ann. Sci. 'Nat., 1 868, p. azS. 



P. affinis, Pekkiek, Nouv. Arch. Mus., 1872, p. 106. 



Megasoolex afilnis, Beddaed, Ann. Mag. Nat. Hist. Oct., 1883, p. 214. 



Definition. Length, bo mm.; number of segments, 116. Clitellum, XIF-XVI, tvith complete 



or incomplete rows of setae. Male pores preceded and followed [on segments XVII, XIX) 



iy papillae occupying a corresponding position. Male pores separated hy 2,6 setae. 



Setae, 140 on VIII ; 108 on X; further hack, 90. Septa, V/IX thickened. Spermathecae 



in VI-IX with a diverticulum as long as pouch, tubular. Ilab. — Celebes ; Philippines ; 



India; Bahamas. 



I fully agree with Hoest that Peeeiek's P. affunis is the same as Vaillant's 



P. posthuma; but Hoest, in my opinion, is slaying the slain in showing, as he does 



in his most recent contribution to the anatomy of earthworms, that P. posthuma, in 



this event, cannot be confounded with P. indica. It is, as he remarks, a stouter 



species, and the papillae in the neighbourhood of the male pores are highly distinctive. 



The species is one of the commonest of the genus, and one obtains it in all collections 



from the East. I have described a curious variation which this species sometimes 



shows, in the presence of three separate spermathecae ^ in one segment and on 



one side of the body. I have also noted a displacement of the papillae, so that 



on one side there was an unpaired papilla in front, and on the other side an unpaii'ed 



papilla behind. In another specimen there were the two normal pairs of papillae 



and an additional one upon the twentieth segment on the right side. I only found 



setae upon the clitellum on the ventral surface of the organ, but Hoest confirms 



the earher statement of Peeeiee that there are complete circles of setae on the 



clitellar segments. 



(54) Perichaeta houUeti, Pereiee. 



p. houlleti, Peeeiee, Nouv. Arch. Mus., 1872, p. 99. 



P. campanulata, EosA, Ann. Mus. Civ. Genova, vol. x (2 a), 1890, p. 115. 

 Definition. Length, 200 mm. Clitellum, XIV-XVI, with complete rows of modified setae [sixty 

 in each) thereon. Male pores separated by twelve setae. Setae, IV, 30/ IX, 49; XIII, 54; 

 those nearest to ventral line rather longer than the others. Dorsal pores commence 

 XI/XII. Intestine commences in XV. The first septum divides segments V/VI ; this 

 and the succeeding two are thickened ; so are septa X/XIII. Spermathecae in VII-IX, 



' I have met with, a similar variation in an undetermined species from British Guiana. 



