Page:The Zoologist, 4th series, vol 1 (1897).djvu/487

Rh species, but well marked. Much has been written on it by Rosa, Eisen, Ribaucourt, Beddard, and myself. It is found in Yorkshire and Scotland, and should be sought for elsewhere among old decaying timber or fallen trees in parks, woods, and forests.

20. A. constricta, Rosa. $26–31⁄0$. Another of the dendrobænic group. I have found it in Sussex, and this year have received it from the county of Antrim, together with a new variety, the description of which I append.

20a. Allolobophora constricta, Rosa, var. geminata, Friend. Length in alcohol, 1¼ in. or 32 mm. First dorsal pore, $5/6$. Colour like the dendrobænic group generally. Prostomium pale, scarcely at all cutting into the peristomium. Male pore not seated on papillæ; no swelling on segment 16. Girdle extending over seven segments (25—31). No tubercula pubertatis. Total number of segments 60, those behind the girdle triannulate. Setæ geminate or in pairs, as in the Lumbricus type. Found by Dr. Trumbull in wood, Co. Antrim, Ireland, 1897.

This small group of worms is semi-aquatic, and maybe readily distinguished by the square tail and the position of the male pores on segment 13 instead of 15, as in the two preceding genera. I reckon three British species and one well-marked variety.

21. Allurus tetraedrus, Savigny. $22–26⁄23–26$. Very widely distributed in the British Isles.

21a. A. tetraedrus var. flavus. A beautiful variety found in a stream near Carlisle, and one specimen in Calverley Woods, Yorkshire. Formerly called A.flavus, Friend.

22. A. tetragonurus, Friend. $18–22⁄19–21$. Described by me in 'Science Gossip,' Nov. 1892, p. 243, from a specimen from Bangor, North Wales. Doubtfully referred to Tetragonurus pupa, Eisen. A well-marked worm, but more specimens are desired.

23. A. macrurus, Friend. $15–22⁄20–21$. Found hitherto only in Dublin. The characters of this species are indisputable, but here again more material is wanted.