British Encliytr&ids. By Rev. H. Friend. 135 



7. The Genus Henlea. 



On more than one occasion in the past this important genus 

 has received attention in these pages. It is therefore unnecessary 

 here to do more than describe those species which have been 

 recently added to our indigenous Annelid fauna. 



1. Henlea glandulosa Friend. 



Resembles, in some respects, H. marina. First described in 

 Irish Naturalise, January 1913, pp. 9-10 ; at the time when my 

 paper on Henleas was in the hands of the Sec, R.M.S. (See 

 Zoologist, March 1913). 



2. Henlea bisetosa sp. n. 



A very small transparent worm. Length 3-4 mm. Segments 

 about 30. Setse 2 throughout. Often a young one may be found 

 growing beside the regular pair, but never three fully formed. 

 Bulbous enlargement of intestine in segment 8, with dorsal vessel 

 originating in 7/8. No oesophageal glands ; but it might be pos- 

 sible to regard the bulb as an unpaired gland. Coelomic corpuscles 

 large, clear, not granular. Special glands (salivaries probably) 

 between the second and third pair of se} .als (similar to H. inusitata). 

 Septals of rather unusual form, three pairs in normal position. 

 Intestine yellowish, chloragogen cells rare. Nephridia begin in 

 6/7, with long slender duct originating behind the septum. 



Though not adult, this species is readily distinguished from all 

 other British forms by the number of setse and the shape of the 

 septals. The position of the salivary glands is unusual, and allies 

 it with H. inusitata. 



Habitat. — Canal side, Dublin. Found by myself March 11, 

 1913, and recorded in Irish Naturalist, September 1913, p. 172; 

 but now described for the first time. Also recorded for Nottingham, 

 April 1913 (£) 



3. Henlea hillmani sp. n. 



Length 5-6 mm. Segments 30-36. Yellowish-white, rather 

 a squatty form. Ventral setse 2-4, usually two dorsally, largest m 

 posterior end. When four are present the innermost pair is 

 shortest. Three pairs of septals, the hind pair with globular pro- 

 cesses behind ; otherwise normal in position and shape. Dorsal 

 vessel arising about thirteenth or fourteenth segment; in one 

 traced to 12/13, in another to 14/15, pulsating forward to seg- 

 ment 5. Brain incised behind, somewhat longer than broad, of 



