442 Dr. W. B. Benham on some 



pair of genital papillae on each of segments xvii., xviii. ; the 

 shape of the spermathecas is different ; whilst the number 

 of chgetas, the character of the spermiducal glands, &c., differ- 

 entiate it from the present species. 



The species may be diagnosed as follows : — 



Pale brown, with white chsetal rings ; median dorsal brown 

 stripe; measures 130x8 millim. ; 74 segments. 

 Male pores small and round, separated by deep furrow 

 (? artifact) ; 3 copulatory papillse in xix., xx., and 2 

 (? 3) in xvii. Six pairs of spermathecte, opening ante- 

 riorly in iv. to ix., the four anterior smaller than the 

 other two ; the sacs irregularly pyriform, with circular 

 furrows and constrictions ; short duct, receiving an 

 undulating diverticulum, longer than sac, and gradually 

 dilating terminally. Chastal ring complete, about 80 

 chsetae in front of and 100 behind the clitellum. Dorsal 

 pore xii./xiii. Paired c£Eca in xxvii., incised to form 

 four secondary ca;ca. Spermiducal gland small, three 

 parallel lobes ; duct curved forwards from the hinder 

 end ; no muscular sac. 



Hah. Bonthain Peak, Celebes. 



Perichceta zebra, sp. n. (PI. XX. fig, 4.) 



This is represented by one specimen, and is very conspicu- 

 ously marked with alternate dark and light bands ; the dark 

 bands, looking black with the cuticle on, are really deep 

 purplish brown ; the light bands are nearly white, slightly 

 yellowish. 



Behind the clitellum the light band — chatal band — is about 

 half the size of the intersegmental dark band ; this band ex- 

 tends downwards at the side, and then rather suddenly narrows 

 to cross the ventral surface as a very narrow strip ; this ventral 

 band is reddish brown in colour. The ventral surface of the 

 eighteenth segment is light ; the dark bands in front and 

 behind do not pass beyond the male pores. 



On the clitellum the banding is still present, but the light 

 band is brown instead of yellowish white. 



In front of the clitellum the dark bands are nearly black, 

 and each is divided into two by a very narrow intersegmental 

 lighter line, scarcely recognizable without a lens. 



The first segment is entirely dark, having no light band. 



The worm measures 200 x 6 millim. behind the clitellum ; 

 it consists of 120 segments ; the posterior end is pointed. 



The male pores are far apart, being separated by about 1 



