OXFORD UNIVERSITY SPITSBERGEN EXPEDITION. 1125 



than in that from which the above description was taken and 

 contained spermatozoa, I could not make out any connection 

 between the two chambers : here again there was no com- 

 munication between the cavity of the spermathecal apparatus 

 and that of the oesophagus. 



Tliere are no copulatory glands. 



The present species is not very unlike the common //. nasuta, 

 which has been recorded from N. Russia and N. Siberia. It 

 difiers, however (I take as the standard of comparison Welch's 

 description, 22), in being smaller, in having a blunt prostomium, 

 in the shortness of the ventral oesophageal nephridium, in the 

 male funnel being here more nearly spherical, in having no 

 glands at the octal end of the spermathecal duct, in having a 

 broader communication between the two ampulla, and in having 

 no communication between spermathecae and oesophageal lumen. 



It also approaches H. urhanensis Welch, found in Illinois (19). 

 The present species is smaller than that one, has fewer setse in 

 the ventral bundles, the ventral oesophageal nephridium is smaller, 

 the dorsal vessel originates in viii., not in ix., the male funnel 

 is much shorter, there are no gland-cells round the ectal end 

 of the spermathecal apparatus, and no communication with the 

 alimentary canal. 



In many species of Henlea the inner ends of the two sperma- 

 thecse are bent downwards, meet, and join to form a common 

 passage which enters the dorsal surface of the oesophagus. In 

 both the species here described the condition is rather different ; 

 instead of meeting at an angle, the spermathecse of the two sides 

 are continued directly into each other across the middle line, and 

 there is no communication with the oesophagus. This absence of 

 communication is just possibly due to the specimens not being 

 completely mature — the oesophageal connection being probably 

 the last portion of the appai-atus to form, — though from the 

 condition of the other organs this hardly seems to be the case. 



Henlea (Henleanella) sp. 



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

 more or less under water, Bruce City; from August 1st to 8th. 

 Five specimens, none fully sexual. 



Unfortunately the specimens are rather too immature to 

 describe. They belong to that section of the genus which has no 

 oesophageal sacs. 



The dorsal and ventral oesophageal nephridia attracted my 

 attention. The dorsal is seen in segm. vi. with a central lumen 

 and lateral branches of some size ; from this portion is continued 

 back a solid cellular cord, regular in form, cylindrical and well 

 defined in the middle line on the oesophagus as far as segm, x. ; 

 the cord, although it has no lumen, seems to take the place of 

 the dorsal vessel, which is not separately visible. The ventral 



Proc. Zool. Soo.— 1922, No. LXXY. 75 



