62 



this organ, published by Beddard (Proc. Zool. Soc. 1890, pi. V, fig. 11) 

 is inaccurate and probably has been made after a badly preserved worm. 



The number of setae in each segment is much greater than in 

 P. indica ; in the segments, lying directly in front of the clitellum and 

 behind it, I counted 90 of them in a row. This number however in- 

 creases in the segments situated more anteriorly, amounting to 108 

 in segment X and to 140 in segment VIII; this is a curious excep- 

 tion of the general rule, that the number of setae decreases anterior- 

 ly, as is the case in most species of Perichaeta. Also upon the cli- 

 tellum setae were invariably present, and not only confined to its ven- 

 tral portion, as stated by Beddard, but continuous all round the 

 body. Between the papillae of the male pores 25 à 26 setae are to 

 be found. 



The internal structure , though agreeing in its main characters with 

 that of P. indica , shows also some differences. The fifth, sixth, seventh 

 and ninth septum are more thickened as they are in P. indica; also 

 the spermathecae have another appearance as in the lastnamed species. 

 They consist (PI. Ill, fig. 30) of a main pouch and a tubular diverticu- 

 lum , of about the same length ; sometimes this diverticulum is a little 

 constricted in its middle and its distal half somewhat dilated. 



At the same station a number of Perichaetidae were found, which 

 are not in a state of sexual maturity and could therefore not be 

 identified. 



12. Perichaeta capensis Horst '). 

 '(— operculata Rosa). 

 Java: Buitenzorg, where the species seems to be common, more 



than fifty specimens; Tjibodas, six specimens. 



The largest of the examples measures about 130 mm., the number 

 of its segments amounts to 110. Cephalic lobe rather broad, ex- 

 tending nearly till the middle of the buccal segment, where a faint 

 groove is visible. The buccal segment is not very distinctly separated 

 from the succeeding one, as pointed out by Rosa; the intersegmen- 

 tal groove however really exists. The male generative pores (pi. Ill, 

 fig. 26) upon segment XVIII, are situated on a papilla, and show in 

 many examples the appearance of somewhat obliquely directed fissures. 



1) Notes Leyden Museum, Vol. V, 1883, p. 195. 



