444 Dr. W. B. Benham on some 



segments. Male pores crescentic, far apart ; outer lip 

 rounded, overhanging the pore, with a small cup-shaped 

 papilla at the tip ; a pair of similar but larger papillae 

 on xviii. in front of the chcetal ring. A single pair of 

 spermathecse in viii. with anterior pore ; sac pyriform, 

 with distinct duct, receiving undulating diverticulum 

 with terminal sausage-shaped dilatation. Ring of 

 chsetge without gaps ; about 65 in front of and 78 

 behind clitellum. Dorsal pore xii./xiii. The cascum 

 in xxvii., simple. Spermiducal gland large, occupying 

 xvi., xvii., xviii., in two lobes, each incised ; long 

 duct curved, without muscular sac (bulb). 



Hah. Bonthain Peak, 6000 feet, Celebes. 



Fertchasta, sp. juv. 



Two immature specimens were collected on Bonthain Peak ; 

 there is no trace of a clitellum. 



In colour this species resembles the preceding worm and our 

 "Brandling" A.foettda, that is, there are alternate bands of 

 dark red-brown and yellow ; but, as in other species of Peri- 

 chceta, the light band is at the level of the cheetae ; the dark 

 bands are in the anterior segments subdivided by a narrow 

 light intersegmental band. Behind the clitellum these dark 

 bands are connected along the mid-dorsal line, so as to give 

 the appearance of a dark line along the back. The coloured 

 bands do not extend downwards beyond the " lateral line," 

 i. e. halfway round the worm, so that the ventral surface 

 is quite pale, with the exception of the three or four most 

 anterior segments. 



The worms measure respectively 84 and 90 millim. ; the 

 number of segments in the smaller worm is 133 — that is, a 

 larger number than in the larger species, P. zebra. 



There is nothing noticeable about the male pores. 



There is one pair of spermathecal pores, vii./viii. 



The first dorsal pore is xii./xiii. 



There is a distinct dorsal gap in the ring of chsetas, which 

 number about the same as in P. zebra, viz. : — 

 62 on segment iv. 

 81 about „ XX. 



These are evidently young individuals, and I have not 

 attempted to place them in a species, though in all probability 

 they belong to P. zebra. 



