Ffieud : The Annelid Fatifia of ]]'o}'cesfei'shii'e. 



427 



my experience, seen a genuine Lumbricus with more than six 

 girdle segments, and these extend in the present instance from 

 segments 32 to 37, the tubercula being on segments 33 to 36. 

 It may be graphically presented in the form of a fraction, thus — 

 The male pores on the fifteenth segment are connected 



33 — 36 



with })rominent papillae. 



Found around Malvern, known to every part of the British 

 Isles, and widely distributed in Europe (Italy, France, Austria, 

 Hungary, Sweden, Norway, Denmark, etc.), and North America 

 See Rosa, Revisione dei Liimhricidi, p. 25. 



2. Lumbricus rubellus Hoffmeister. Considerably smaller 

 than the former, but similar in colour and general appearance, 

 so that robust forms might easily be confused with the smaller 

 forms of L. terrestris L. But they are instantly differentiated 

 by means of the girdle and male pores. In the case of L. rubellus 

 the pores cannot be seen, while the fractional index for girdle 



and tubercula is !^ 



In Northern Europe, this species also 



is said to attain a much larger size than with us, but the girdle 

 segments do not change. 



Found around Malvern ; general distribution as in the case 

 of L. terrestris L. 



3. Lumbricus festivus Savigny. In size and general 

 appearance hardly distinguishable from L. rubellus. The male 

 pores are, however, prominent, and the index for girdle and 

 tubercula is 3^ _ 3^ . Hence the two are at the extremes of the 

 line of development. This will be best understood by reference 

 to the following table, which gives a bird's eye view of the seg- 

 ments on which the tubercula are situated. For finding the 

 girdle one has only to add a segment to each end. 



1 909 Dec. 1. 



