60 



the white ring, upon which the setae are situated, visible in some 

 alcohol-examples, is also interrupted on this point. In the smaller 

 examples I found the number of setae in a row not so great as in 

 the larger worms, 60 à 70 instead of 100. The male pores lie in a 

 line with the 16th seta, laterally from the median ventral line; the 

 number of setae between these pores is liable to variation. 



10. Perichaeta indica Horst. 



Java: Buitenzorg. 



Sumatra: Singkarah, Manindjau, Kaju tanam; only few spe- 

 cimens. 



In my earlier papers on P. indica l ), dealing with examples from 

 Java and Sumatra, an elaborate description of this species was given. 

 Beddaed also mentions specimens from New-Caledonia 2 ) and South- 

 America 3 ) , so this species appears to have a very wide distribution. 

 It is presently a common host of our hot-houses, being imported 

 with tropical plants from abroad. According to the observations of 

 Mr. Fbrgusson 4 ) however, it appears only to be found in hot-houses 

 where is kept up a temperature of 60°, but never in any of the 

 cooler ones; on the contrary the worms should die out or disap- 

 pear in those of lower temperature. Among the examples, collected 

 by Pkof. Weber at Singkarah, some had a body-length of 160 mm., 

 a dimension never observed by me before. The first dorsal pore 

 appears to be situated one segment more backwards than in P. Houlleti, 

 viz. in the intersegmental groove XII/XIII, as also observed by 

 Beddard. In none of the examples, at my disposal, copulatory papillae 

 could be found; however I my earlier paper I described two pairs 

 of them on segments VII and VIII, and Beddard observed them al- 

 so on segment VI in specimens from New-Caledonia. Moreover the 

 latter author found in examples from S. America „in the first few seg- 

 ments of the body two specially large and distinct pairs of setae." 



With regard to the internal anatomy it may only be mentioned, 

 that some of our specimens show at the duct of the diverticulum 



1) Niederl. Arch. f. Zoologie, ßd. IV, 1879. p. 3, pi. VIII. Notes Leyden Museum, 

 Vol. V, 1883, p. 186. 



2) Proc. Zool. Society, 1886, p. 298. 



3) ibidem, 1890, p. 57, PI. IV, fig. 1, 2 and 3. 



4) Note on P. indica by Rob. Service; Proc. R. Phys. Soc. Edinburgh. 1890, p. 396. 



