i88 



BRITISH ANNELIDS. 



their size, whereas in the dendrobcenic form they are exactly hke 

 those of the other tree-frequenters. This is the sole distinguishing 

 mark between the two forms. 



The girdle occupies six segments (31-36), two of which carry 

 papillae (32 : 34). The first dorsal pore is between segments 5 and 6, 

 and modified setge occur on 31, 32, 35, while tumidities are found 

 on the 9th (or loth), 25th, and 26th segments. There are about 

 100 segments in the average worm. So far I have not seen the 

 terrestrial form from Essex ; but among some Dendrobcenes taken 



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Explanation of Figukes. 



Fig. I. 

 F.g. 2. 



Fig. 3. 

 Fig. 4. 



-A. celtica, Rosa, as found in England ; nat. size. 

 -Var. rosea. Friend. INIagnified 2 diameter.s. 



in. p. Male pore on segment 15. 



pr. Prostomium or lip. 



tf>. Tuberciila pubertatis on girdle segments. 

 -.-!*. celtica, Rosa. Segments 13-18. 

 -Var. rosea. Friend. Segments 13-18. 



;//./. Male pores on segment 15. 



/. papilla; or cushions exiending over segments 14-16 ; enlarged. 

 All the figures are diagrammatic. 



from old trees in Epping Forest I have found one or two specimens 

 of var. rosea. Spermatophores are found on the terrestrial form. 



4. The Gilt- tail (yAlloIobophora subnibiciDida, Eisen), is the 

 most ubiquitous and protean species in the group, and it can adapt 

 itself in a wonderful way to its environment. I find no fewer than 

 three well-marked forms or varieties, in addition to the typical tree- 

 haunting species. These merit a note. The type is found inside 

 old decaying timber, or under the bark of rotting trees. It resembles 

 the other three species in its brown colour, wide setie, pallid lip, and 

 other particulars. The girdle usually begins oii the 25th, and ends 



