1126 DR. J. STEPHENSON ON THE OLIGOCH^TA OF THE 



oesophageal nepliridium is confined to segm. vi. ; it consists 

 mainly of two masses, one on each side of the middle line ; each 

 mass has folded walls and a considerable lumen. 



Henlea (Hepatogaster) sp. 



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

 more or less imder water, Bruce City ; end of July and beginning 

 of August 1921. A single specimen. 



This specimen was taken near the last, but in a different moss- 

 zone. The oesophageal diverticula take the form of a number of 

 communicating tubules, as in the worms called Hepatogaster by 

 Cejka (3) and in Henlea tuhulifera and H. mocleraia as described 

 by Welch (18, 19). I could not discover whether there were or 

 were not dorsal and ventral cesophageal nephridia, as my sections 

 of the worm were not very successful. The dorsal vessel begins 

 in ses'm. ix. 



Genus LuMBRiciLLus Orst. 



LUMBRICILLUS ^GIALITES, Sp. n. * 



Spitsbergen ; in seaweed at high-tide mark on shore, at head of 

 Klaas Billen Bay in Icefjord, by Bruce City ; last week in August 

 1921. Numerous specimens. 



Length up to 17 mm.; maximum diameter '65 mm. Colour 

 brownish (fixed in Bouin). Segms. 52-53. Prostomium rounded, 

 hemispherical. Head-pore not made out Avith certainty, probably 

 present. 



A cuticle is not usually separately discernible ; it is sometimes 

 seen in the anterior segments, when it is not more than 1 /^ in 

 thickness. 



Fairly numerous deeply staining (with hfematoxylin) mucous 

 cells are seen in transverse rows in the surface epithelium — not, 

 however, causing eminences on the surface. 



Clitellum |xi.-xiii. (:=2^), not very well marked. 



Set^e enchytraeine (distal portion straight), blunt. In the 

 ventral bundles in front of the clitellum 4 or 5 setse ; behind the 

 clitellum 3, or at the hinder end 2. In the lateral bundles in 

 front of the clitellum 3 ; behind, 3 in most segments, 2 at the 

 hinder end. 



The septal glands are in segms. iv., v., and vi. ; septum 6/7 is 

 bulged backwards by the last gland. 



There are no salivary glands. There are, however, a pair of 

 postpharyngeal bulbs — club-shaped structures in connection with 

 the dorsal wall of the alimentary tube at the junction of pharynx 

 and ossopliagus. Their total length is 240 ,u ; they are constituted 

 by a solid mass of cells in the form of a knob, and a stalk which 



* 'Aiyi«\tr?js, of tlie shore. 



