194 



ON A COLLECTION OF EARTHWORMS FROM NEW BRITAIN, ETC. 



DESCRIPTION OF PLATE XXI. 



Fig. 1. Perichaeta solomonis : ventral surface of anterior segments. 



2. Perichaeta upoluensis „ „ 



3. Perichaeta sedgwickii „ ,, 



4. Perichaeta pacifica „ „ 



5. P. solomonis : spermatheca. 



6. „ sperm id ucal gland. 



7. P. upoluensis : spermiducal gland. 



8. ,, spermatheca. 



9. P. novae-britanniae : ventral surface of segments XIII — XIX. 



Note. To facilitate comparison it may be repeated here that the clitellum, in all the 

 species figured, occupies segments XIV — XVI. The female orifice lies in the middle of segment 

 XIV, and the paired male orifices occur on segment XVIII. One of the chief objects of the 

 external views is to illustrate the appearance and distribution of the copulatory papillae 

 which, as described in the text, are subject to considerable individual variation. 



