422 OLIGOCHAETA 



(48) Perichaeta vaillanti, BEDDABD. 



P. vaillanti, BEDDAED, P. Z. S., 1890, p. 66. 



Definition. Clitellum, XIV-XFI, without setae. Dorsal pores present. No specially 

 thickened septa. Spermathecae in VI IX, with short diverticulum. Spermiducal glands 

 with a large terminal sac. Had. Luzon. 



This species is also characterized by its peculiar sperm-sacs (see PL v, fig. 10 of 

 memoir). There are two pairs of sacs in segments xi, xii; from each a tubular 

 outgrowth arises which perhaps meets its fellow in the middle line above the intes- 

 tine. I have illustrated the sperm-sacs. P. vaillanti comes very near to P. enganensis, 

 but the relative length of the spermathecal diverticulum distinguishes them. 



(49) Perichaeta sumatrana, HOEST. 



Megascolex sumatranus, HOEST, Notes Leyd. Mus., vol. v, 1883, p. 189. 

 P. sumatrana, HOEST, Midden Sumatra, Vermes, 1892, p. 5. 



Definition. Length, 70 mm. ; breadth, 4 mm. ; number of segments, 94. Clitellum, XIV- 

 XVI, without setae. Setae 38-44 per segment, in front of and behind clitellum. 

 Intestine begins in XIV. Spermathecae in VIII, IX. Spermiducal glands with terminal 

 sac. Had. Sumatra; Hong Kong; Barbadoes. 



I am not quite certain, as I pointed out at the time, that the species which I 

 described (55) as P. sumatrana is the same as HOBST'S species. In my Perichaeta 

 the spermathecae are a segment in front of the position that they are stated to 

 occupy by HOEST in his latest note (17) upon the species. The worms seen by 

 myself vary somewhat in colour ; one individual (figured in colour) was of a bright 

 green marked with lighter bands ; in the others the green was replaced by an olive 

 brown. 



(50) Perichaeta pentacystis, ROSA. 



P. pentacystis, ROSA, Ann. k. Hofm. Wien, Bd. vi, 1891, p. 400. 



Definition. Length, no mm. ; breadth, 6mm.; number of segments, 82. Clitellum, XIV- 



XVI. Male pores correspond to eighteenth seta. Genital papillae on, segments VIII, 



XVII, XVIII ; a pair on each. Number of setae on the middle segments of the region 

 in front of the . clitellum about 100. Dorsal pores commence XIV/XV. Gizzard in 

 VIII ; intestine begins in XV (? as to caeca). Septa IV/VII ami XI/XII thickened ; 

 septa VII/IX present but delicate; blood-glands found in the first seven segments. 



