Earthworms from Celebes. 447 



rectangular brown area. Each spermatheca 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 

 chtetfe are about 50 in front of and 70 behind the 

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

 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. 



Ilah. Bonthain Peak, 6000 feet, Celebes. 



EXPLANATION OF PLATES XX. <fc XXI. 

 Plate XX. 



F{(/. 1. Terichceta jampeana. 



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



pat 16 chsetfe between the pores instead of 13.) 

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



small piece undei'lying the penial duct and protruding 



beyond it. 



1 c. Spermatheca. 

 Fig. 2. Perichceta digifata. 



2 a. Spermiducal gland. 

 2 b. Spermatheca. 



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



are inserted in the dilatations and not in the constrictions of 



the intestine. 

 Fig. 3. Perichceta bonthainensis. 



Za. View of the male pores (c5') and copulatory papillae, X 4. po, 



porophore. 

 35. Spermiducal gland, x 4. s/jt?., 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 XXI. 



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 copulatorj' papillae, 



X 5. 

 4 c. A spermiducal gland, x 4. 



4 rf. A spermatheca. 

 Fig. 5. Perichceta hexatheca. 



5 a. Ventral view, to show the male pores ( J ) and copulatory papillae. 

 5 b. Spermiducal gland, X 3. 



31* 



