EARTHWORM STUDIES. 459 



species, but well marked. Much has been written on it by Rosa, 

 Eisen, Ribaucourt, Beddard, and myself. It is found in York- 

 shire and Scotland, and should be sought for elsewhere among 

 old decaying timber or fallen trees in parks, woods, and forests. 



20. A. constricta, Rosa. —5—. Another of the dendrobaenic 

 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. 



New Variety of Earthworm. 

 20a. Allolobophora constricta, Rosa, var. geminata, Friend. 

 Length in alcohol, 1 J in. or 32 mm. First dorsal pore, f . Colour 

 like the dendrobaenic group generally. Prostomium pale, scarcely 

 at all cutting into the peristomium. Male pore not seated on 

 papillae ; no swelling on segment 16. Girdle extending over 

 seven segments (25 — 31). No tuber cula pubertatis. Total num- 

 ber of segments 60, those behind the girdle triannulate. Setae 

 geminate or in pairs, as in the Lumbricus type. Found by Dr. 

 Trumbull in wood, Co. Antrim, Ireland, 1897. 



III. Genus Allurus. 

 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. 3^26* Very widely distri- 

 buted in the British Isles. 



21a. A. tetraedrus Y&v.flavus. A beautiful variety found in a 



stream near Carlisle, and one specimen in Calverley Woods, 



Yorkshire. Formerly called A.flavus, Friend. 



10 00 



22. A. tetragonurus, Friend. ^^. 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. ^=|. Found hitherto only in 

 Dublin. The characters of this species are indisputable, but 

 here again more material is wanted. 



