ZooL.— Vol. II.] EISEN—OLIGOCHALTA. 187 



Penial SetcB. — (figs. 152, 153.) These setae are present 

 and not rudimentary; they are very minute, curved, and of 

 unequal length. The longer seta is very slender, several 

 times longer than ordinary setae. The shorter seta is 

 thicker and undoubtedly not yet developed. The apex of 

 the longer seta is hooked and sculptured. The sculpture is 

 different from that of the spermathecal setae and less 

 elaborate. There are rows of spine-like elevations combined 

 with depressions difficult to describe. 



Septal and Pharyngeal Glands. — Besides the usual mass 

 of suprapharyngeal glands there is also a row of subpharyn- 

 geal glands of small size, on the ventral side of the pharynx, 

 opening into its posterior part. There are very small septal 

 glands in VII, VIII and IX, attached to muscular strands 

 coming forwards. The longitudinal diameter of these glands 

 is no greater than the diameter of the dorsal vessel, and in 

 longitudinal sections they appear to be of the same size as 

 the isolated subpharyngeal glands. 



Intestine. — The oesophagus is very narrow and tubular; 

 it curves upwards from the pharynx. The tubular intestine 

 runs straight on from the gizzards to the sacculated intestine 

 and is thickly surrounded by chloragogen cells. It is only 

 slightly nipped by the septa. The sacculated intestine com- 

 mences in XVII. . 



SpermatheccB. — (figs. 147, 148.) The two pairs of 

 spermathecas occur in VIII and IX. In the specimen dis- 

 sected, as well as in the one sectioned, the anterior sperm- 

 athecas are much longer and narrower than the posterior 

 ones. I have observed this to be the case also in D. singu- 

 laris subsp. caroliniana, and it may possibly be character- 

 istic. The diverticle is hardly, if at all, perceivable from 

 the exterior. In one spermatheca no exterior diverticle 

 could be detected, in the other there is only the slightest 

 swelling. In sections the spermathecal diverticle is distinct 

 enough, forming a cavity in the spermathecal wall. It is 

 divided into several chambers by trabecules. Figures 147 



