Earthworms from Celebes. 433 



by 14 chgetse, are wide deep pits with fairly well-marked 

 lips, which are raised up and lighter in colour than the sur- 

 rounding surface. Indeed, this region resembles that of 

 P. jamjpeana if we imagine that that species had been much 

 more contracted. 



There are two ^dixx^oi s'permathecal pores — between segments 

 vii./viii., viii./ix. — at about the level of the seventh and eighth 

 chaetse from the middle line. 



The chcetce do not form quite a complete circle, as there is 

 a dorsal gap behind the clitellum which, though subject to 

 variations, is always greater than twice the normal inter- 

 chaetal gap. This dorsal gap is scarcely recognizable on the 

 first six segments. 



The ventral gap is smaller behind the clitellum, though 

 distinct enough in front of it, where it is about twice the 

 normal interchsetal gap. Posteriorly it gets more nearly to 

 equal this gap, and thus is not so readily recogni:iable. 



The chaitae do not appear to be so closely set as in the 

 preceding species. There are 30 chjet^ on the left side in 

 segment iii. ; many had apparently dropped out on the right 

 side, and the worm was too much hardened to remove the 

 cuticle successfully. We may regard 60 as approximately 

 the number on segment iii. 



98 on segment vii. 

 100 „ xiii. 



99 „ XX. 



100 on a segment much further back. 



It is worthy of note that the chjette along the side are 

 smaller and closer together than above or below. 



Internal anatomy. — In addition to the thick septa round 

 the pharynx, those between the following segments — x./xi., 

 xi./xii., xii./xiii., xiii./xiv. — are very much thicker than the 

 rest. Septum xiv./xv. is much thinner than these, but is 

 thicker than the following ones. 



Some stress, perhaps too much, has been laid upon the 

 number of thickened septa, so that 1 have paid some attention 

 to them in these worms ; but, so far as my experience goes, 

 they are not of importance as specific characters, though it is 

 possible that they may characterize allied groups of species. 



There is a trace of septum viii./ix. 



The gizzard occupies segments viii. and ix. — that is to say 

 that the space between the two septa vii./viii. and x./xi. is 

 not wholly occupied by the gizzard, but a small part of the 

 oesophagus equal to about the length of a segment intervenes 

 between the gizzard and the septum x./xi. 



The most striking and interesting as well as novel feature 



