122 Proceedings of the Royal Physical Society. 



otherwise recorded from the British Isles. It occurred in considerable numbers 

 in mud under water on the margins of small streams in three localities, in 

 two of which I have found it again during the present month. The sub- 

 merged habitat is evidently quite natural to it, and when taken from the 

 mud it is seen to be more or less enveloped by a thin film composed of 

 mucus and fine particles of sediment. Colour rose-red, the dorsal blood- 

 vessel being clearly visible through the transparent cuticle ; length two to 

 three inches ; and, for a Lutnbricid, of distinctly slender build. 



Although I have no mature examples to produce, and am uncertain 

 whether there were any among the specimens sent to Dr Michaelsen, I 

 have nevertheless every confidence in his identification. 



Localities: — Ditch at Seafield, near Roslin, Jan. 1905; ditch near Craig- 

 lockbart, Feb. 1905, and March 1910; stream above Torduff Reservoir, Pentland 

 Hills, March 1905 and 1910. 



Our two remaining Helodrili belong, according to Michaelsen, to the 

 subgenus Bimastus, H. F. Moore. 



Helodrilus (B.) eiseni (Levins.). 



Allolobophora eiseni, Beddard's table, I.e., p. 391. 



I have obtained this species on but two occasions, which would seem to 

 indicate that it is not common in the area. The fact that its prostomium 

 completely cleaves or is dove-tailed into the first segment gives it the dis- 

 tinction of being the exception to the rule that otherwise serves to separate 

 the genus Lumlricus from the rest of the family. 



My two records are as follows : — 



Boltonmoor, near Haddington, two, under bark of fir stump, April 1905; 

 and Ravelrig, near Balerno, two, under bark of dead beech, March 1908 (de- 

 termined hy Mr Southern). 



Helodrilus (B.) constrictus (Rosa). 



Under the names Allolobophora piUris and A. arborea the present species and H. rubidus 

 (p. 121) have been much confused. 



This small reddish Lumbricid is fairly common,, occurring wherever there 

 are dead trees and decayed stumps, beneath the bark of which it finds shelter 

 and an abundant food supply. 



Examples from nearly all of the following localities have been submitted 

 either to Mr Friend or Mr Southern : — 



Bavelaw Wood, near Balerno, under bark of rotten fallen pine, April 1903; 

 Comiston, under bark four feet from ground on partially dead beech, Oct. 1904; 

 Boltonmoor Wood, common in fir, etc., stumps, April 1905 ami 1906; Clack- 

 mannan Forest, Sept. 1901; Doune, under bark of old willow, April 1905; 

 Oullalo, Fife, in decayed tree, Feb. 190S; wood near Thornton, March 1910. 



