1120 DR. J. STEPHENSON ON THE OLIGOCH^TA OF THE 



The septal glands are bulky, the last, iii segm. vi., causing 

 septum 6/7 to bulge back very considerably. 



Dorsal and venti'al oesophageal nephridia are present, but less 

 conspicuous than in the next species. The dorsal nephridium is 

 •double, consisting of two masses, one on each side of the middle 

 line, attached behind to the dorsal side of the dorsal vessel near 

 the angle which the vessel makes with the septum (6/7) and 

 laterally to this on the anterior face of the septal gland ; the 

 masses have perhaps a small connection with each other across 

 the middle line. Each is very irregular in shape, and the attach- 

 ment to the dorsal vessel and septal gland is relatively narrow ; 

 portions of the mass consist of long strings of cells extending 

 forwards and upwards in the segment. 



The ventral neplnidium is contained wholly in the oesopliageal 

 wall, and is rather indistinct — indeed, in one of my two series of 

 longitudinal sections it is scarcely to be made out ; it is not 

 obviously paired, and extends behind into segm. vii. 



A pair of postpharyngeal bulbs axe present — small solid groups 

 of cells behind the pharyngeal mass, continuous with a dorsal 

 upfolding of the oesophageal epithelium. These structures may be 

 compared with those described in the account of the next species ; 

 but here they are very much less definite, the knobs of cells less 

 distinctly limited, the lumen of the upward fold of oesophageal 

 epithelium much less marked, indeed hardly present, and the 

 whole smaller. 



Ohloragogen cells begin in segm. vii. ; in this segment, however, 

 they are only scanty. 



The oesophagus expands to form the intestine in segm. viii. In 

 this segment there is a slight invagination backwards of the 

 oesophagus into the broa^der intestine behind ; there are no 

 diverticula. In each of the segments behind vii. the canal is 

 swollen out into an ovoid shape, and this is the case in the 

 genital segments also. There are no chylus-cells. 



The coelomic corpuscles are large, granular, and elliptical, oval, 

 or fusiform in shape, of an average length of 29 //, ; small nuclei, 

 with a centi-al nucleolar dot, are visible in some, though not dis- 

 tinctly discoverable in all. 



The dorsal vessel originates in the anterior part of segm. ix. as 

 a sudden swelling just behind the septum; it contains numerous 

 corpuscles. The blood was probably colourless. 



The nephridia have a relatively large anteseptal portion in 

 which the central lumen undergoes some windings; the post- 

 septal portion is ovoid, and not large ; in one specimen the duct 

 appears to be prolonged back from the hinder end of the body of 

 the organ, and lies on the body-wall ; in a second, the duct can be 

 seen in sections to come off from the under (or under and outer) 

 side of the postseptal portion considerably in front of its hinder 

 end. 



The sexual organs are more completely developed in the second 

 specimen (taken on the 10th of August), which will therefore be 

 described. 



