TEEE-WOEMS OE GEEAT BEITAIN". 301 



it very closely resembles) disposed in bundles alternating with 

 the intersegmental groove. The prostomium dovetails into the 

 first segment to about two thirds of its diameter. The male 

 pores are easily seen on the white papillae of the 15ih segment. 

 The girdle is constant upon segments 26 to 31, but there are no 

 bands {tubercula pulertatis). The setae are disposed in wide 

 pairs or nearly equidistant rows. The worm is very active, as 

 indeed are most of the group, and like the others it emits 

 a yellow inodorous fluid. It is distinguished from the Gilt-tail 

 by the greater number of segments compressed into the same 

 length, and the absence of the band. There are no synonyms, 

 and its known distribution is Italy (Ceres and Eosazza) and 

 England (Dallington, Sussex). 



5. A. (Dendeob^ka) aeboeea, Msen. (PI. XXI. fig. 3.) 

 This diminutive worm w^as first described by Eisen in 1873. 

 It appears to have been as entirely overlooked up till that date 

 as the last-named species was till eight years ago ; and I have 

 little doubt but that in future years, when the decaying forest 

 trees of other lands come to be explored, we shall find several 

 other species which up till the present time have passed alto- 

 gether unobserved. The description of Eisen is true of our 

 native species. Body cylindrical, prostomium large and pale, 

 occupying about one half of the first segment. Male pores on 

 segment 15 tumid and conspicuous. Girdle for the most part 

 composed of six segments extending over 26-31. Tubercula 

 puhertatis on the 14th and 15th segments behind the male pore, 

 i. e. on segments 29, 30. The anal segment somewhat exceeds 

 that which precedes it in length. The setae are everywhere 

 in distant pairs. Segments 50-60 (sometimes more in British 

 specimens) ; length about 50 millim. (not so great in my British 

 specimens). Eirst dorsal pore between 5 and 6. Like Den- 

 drohcena Boechii (says Eisen), this species is found in old stumps 

 of trees, into which, however, it penetrates further than the 

 latter species. The specimens sent me from Gloucestershire 

 ' were found deep in the wood, while two other species {A. celtica 

 and A. Eiseni) were found in the same stump less deeply 

 imbedded. Eisen examined one specimen in which the tubercula 

 j>ubet^tatis extended over segments 28-31. At first sight the 

 species resembles Z>. BoecMi, remarks Eisen, and it is marvellous 

 that he should found a genus for tree-haunting worms, and 

 exclude from it his own arborea. 



