Earthworms from Celebes. 447 



rectangular brown area. Each sperraatheca consists 

 of a globular sac, with a narrow duct half its length, 

 and a long straight diverticulum, longer than sac, 

 with a terminal expansion sharply curved. The 

 chjetae are about 50 in front of and 70 behind the 

 clitellum. The dorsal pore is xi./xii. Paired caeca, 

 simple, in xxvii. Spermiducal gland small, oval, 

 deeply incised to form a number of radiating lobules ; 

 duct long, narrow, S-shaped, with sharp bends. No 

 bulb. 



Ihh. Bonthain Peak, 6000 feet, Celebes. 



EXPLANATION OF PLATES XX. & XXL 

 Plate XX, 



Fiy. 1. Perichceta jampecma. 



1 a. View of male pores ( c?), X 3. (The lithographer has, in error, 



put ]6 chastse between the pores instead of 13.) 

 1 h. Spermiducal gland, X 8. gl, the main part of the gland ; gl' , a 



small piece underlying the peuial duct and protruding 



beyond it. 



1 e. Spermatheca. 

 Fig. 2. Perichceta diyitata. 



2 a. Spermiducal gland. 

 2 b. Spermatheca. 



2 c. Ctecum (c), with neighbouring part of intestine. The septa («) 



are inserted in the dilatations and not in the constrictions of 

 the intestine. 

 Fig, 3. Perichceta honthainensis. 



3 a. View of the male pores (J) and copulatory papillae, X 4. po, 



porophore. 

 3i. Spermiducal gland, X 4. s/jc?., sperm-duct. 

 3 c. Intestinal caecum. 



3 d. View of the posterior end of the worm from behind, to show 



the horizontal anus (a), d.p., dorsal pores, 



Plate XXL 



Fig. 3 e. The septal pouches of some of the anterior segments, p, the 

 bifid pouch in segment xvi. ; p', other pouches in succeeding 

 segments ; o, opening of pouches through the septa into the 

 segments ; d.v., dorsal vessel ; int, intestine ; s, septa. 



Fig. 4. Perichceta zebra. 



4 a. Side view in middle region of the body, to show characteristic 



colour-bands, X 4. 

 4 b. Ventral view, showing male pores ( cJ ) and copulatory papillae, 



X 5. 

 4 c. A spermiducal gland, X 4. 



4 <^. A spermatheca. 

 Fig. 5. Perichceta hexatlieca. 



5 a. Ventral view, to show the male pores ( cJ ) and copulatory papill<B, 

 5 h. Spermiducal gland, x 3. 



31* 



