SIBOGLINUM CEYLONICUM 



305 



metameric part of the trunk is 2 to 5 mm long and the whole preannular 

 region was 21 mm long in one specimen, but is usually more than 40 mm 

 and in one specimen it is 79 mm long. The mesosoma is 0-15-0-18 mm broad. 

 A complete specimen, including the tentacle, may possibly reach 80-100 

 mm long. 



0.05 



MM 



в 



0.1 



MM 



Fig. 00133. Siboglinum ceylonicum: A - spermatophore ; B-F - successive parts of the tube. 



In three males I have found numerous cigar-shaped spermatophores 

 (Fig. 00133y4). The base of the filament of the spermatophore is rather 

 thick, but the greater part, as usual, is very thin. The filiform sperm are 

 hard to see; they are very delicate and thin, lying parallel to the length of the 

 spermatophore in the anterior half and arranged spirally in the posterior 

 half. The spermatophore is 0-22 mm long by c. 0-03 mm broad. 



