440 Dr. W. B. Benham on some 



narrow diverticulum, dilated terminally; slight gaps 

 in the ring of chsetEe, which number about 90 in tront 

 of and 130 behind the clitellum, those on iv., v., vi. 

 larger, and those on ii., iii. smaller, than on other 

 segments. Dorsal pore xii./xiii. Paired cseca in xxvii. 

 with secondary ca^ca. Sperm iducal gland compact, 

 ear-shaped, occupies segments xvi., xvii., xviii., not 

 much incised, with thick nearly straight duct ; no 

 muscular bulb. 



Uab. Bonthain Peak, Celebes. 



PericJiceta hexatheca^ sp. n. (PI. XXI. fig. 5.) 



This species, again, is represented by a single specimen. It 

 is pale brown, with white rings at the level of the chaetaj. 

 In the post-clitellar region there is a brown band running 

 along the mid-dorsal line. The sides are pale and serai- 

 transparent. 



The worm measures 130x8 millim. and consists of 74 

 segments. 



The clitellum is well marked, darker brown, with three 

 whitish bands, but without chgetge. 



Owing to the contraction of the ventral surface the male 

 pores are brought close together and are separated by a fairly 

 deep furrow, the bottom of which presents longitudinal folds 

 of the cuticle (?of the body-wall as well). This furrow runs 

 across segments xvii., xviii., and reminds one of the condition 

 sometimes presented by Acanthodrilids. Each pore is small 

 and rounded (fig. 5 a). 



There are 8 copulatory papillce, arranged as follows : — 3 in 

 a row on segment xx., 3 on xix., and 2 on xvii. It is 

 possible that a median one exists here, but owing to the in- 

 folding of the wall I could see none; they are all situated in 

 front of the chaetal ring. 



The s^^ermothecal pores^ of which there are six pairs, can 

 scarcely be discerned externally; they lie in the grooves in 

 front of the fourth to ninth segments, close to the middle line, 

 about ten chana^ from one to the other. 



The first dorsal pjore is xii./xiii. 



The chcetui form a complete ring. I was unable to pull 

 the cuticle off in order to count the chajtee in the second 

 segment. On the worm itself I counted 70 on segment vi., 

 80 or more on segment xiii., and more than 100 behind the 

 clitellum ; they are very small. 



Internally, attention may be directed to the ccecutn, arising 



