Southern — Monograph of the British and Irish Oligochceta. 147 



Henlea ventriculosa (Udek.). 



1896. H. v., Friend in Naturalist, p. 298. 



1907. H. v., Southern in Irish Nat, p. 70. 



Mature throughout the year. 



Habitat — Ireland. Co. Kerry (Glencar) ; Co. Wicklow (Bray Head and 



Devil's Glen); Co. Dublin (Lambay ; summit of Montpelier); 



Co. Meath (Beauparc) ; Co. Armagh (Armagh) ; Co. Donegal 



(Milford). 

 Scotland. Lough Gelly, Fife ; Pentland Hills. 

 Distribution — Common in Europe. 



Bryodrilus Ehlersi Tide, var. ? 

 Plate VII., fig. 4. 



1892. B. E., UdeinZool. Anz., vol. xv., p. 344. 



1895. B. E., Ude in Z. f. wiss. Zool., vol. Ixi., p. 111. 



1904. B. E., Bretscher in Rev. Suisse de Zoologie, t. xii., p. 261. 



Several specimens of a species belonging to this genus were found in a 

 decayed tree-trunk. They agree in many points with the species described 

 by Ude (torn, cit.) ; for instance, in the reproductive organs, coelomic corpuscles, 

 septal glands, clitellum, and dorsal blood-vessel. 



The specimens are 15 mm. long. The anterior ventral bundles contain 

 6-7 setse (Ude gives 5, rarely 6). The nephridia (PI. vii., fig. 4) are somewhat 

 different from Ude's description and figure. The anteseptal portion is narrow 

 and long, and the duct rises about the middle of the postseptal. The brain 

 is concave in front, and not acutely cut, as Ude figures it. In the 6th segment 

 there are four organs, two latero- ventral and two latero-dorsal, closely applied 

 to the gut. The ventral pair are slightly further back than the others. 

 The last pair of septal glands fills the 6th and 7th segments. 



The relations of the four peculiar glands in the 6th segment are not easy 

 to determine in the living worm. Examination of transverse sections showed 

 that the four glands do not open into the gut on the same level ; and Ude's 

 figures of this section are very diagrammatic. 



The differences between this form and the B. Ehlersi of Ude, viz., size, 

 number of setas in a bundle, brain, nephridia, etc., do not appear large enough 

 at present to justify the creation of a new species. 



August. 



Hahitat — Under bark of dead tree, Powerscourt, Co. Wicklow. 



Distribution — Germany ; Switzerland. 



