1136 DR. J. STEPHENSON ON THE OLIGOCH^TA OF THE 



Length 3-3"5 mm.; diameter -IT mm. Segments 22, or 22 

 with some incomplete segments behind. Colour dark. Setee 

 enchytrjBine in form, two per bundle throughout the body. No 

 salivary glands. Coelomic corpuscles fairly numerous, oval, 

 nucleated, 12-14 /x in length. The dorsal vessel originates in 

 segm. xii. The nephridia have a large anteseptal portion, nearly 

 as lai'ge as the postseptal ; the duct undergoes several windings 

 in the anteseptal portion ; the organ is somewJiat constricted at 

 the septum; and the postseptal portion is elongated, the duct 

 being continued from the hinder end. 



The testes were in an early stage, of large size, taking up a 

 very large part of segm. xi. ; scarcely any sperm-morulfe had 

 formed, the testes were lobed, but not •' divided." The funnels 

 were very small, and twice as long as broad ; but it is more than 

 likely that these proportions would not be maintained throughout 

 the further development of the organ. There was a small, ovoid, 

 and well-defined penial body. 



The ovaries were lobed in the same manner as the testes. The 

 spermathecal ampulla was short, subspherical, and the duct cylin- 

 drical, entirely destitute of surrounding gland-cells. There were 

 no copulatory glands. 



The numbers of the seta? (2 per bundle throughout the body), 

 the large anteseptal part of the nephridia, and the presence of a 

 lumbricilline penial bulb constitute a group of characters which, 

 along with the small size of the worms, may permit of recognition 

 in the future; but I disapprove of the practice of giving names 

 to incompletely described or immature material. 



Genus Mesenchytk.eus Eisen. 

 Mesenchytrjeus sp. 



Spitsbergen ; a,mong plants of dry tundra. Cape Boheman in 

 Icefjord in W. Spitsbergen; 12.vii.l921. A single specimen. 



Spitsbergen ; among mosses on the bank of a fresh- water pond, 

 more or less under water, Bruce City; end of Jul}- and beginning 

 of August 1921. Two specimens. 



Like the last, the present specimens are too immature to 

 name. 



Length 7-10 mm. : maximum diameter -B-'S mm. Segms. 46 

 -54. Colour dark brown. The worms are solid-looking, like the 

 young of earthworms. A large head-pore near the tip of the 

 proboscis. Setea lumbricine in shape, stout and relatively short, 

 with sigmoid curve ; in the venti'al bundles 4, 5, or 6 throughout 

 the body ; in the lateral 2 or 3 throughout, or sometimes behind 

 the clitellum 4 or 5, and occasionally, in front of the clitellum, 

 one only. 



Coelomic corpuscles rather small, 12-20^, granular, with deeply 

 staining granules or network, and a small nucleus visible only 

 with difficulty. No salivary' glands ; postpharyngeal bulbs 



