64 



liKITISH ANNELIDS. 



Setce always in couples, four couples on each segment, the individuals 

 of which are close together [not ornamented, copulatory setK 

 longer, common setaey shaped]. 

 Clitellum always composed of six segments, usually closely fused, 

 commencing somewhere between 27 and 34. [In L. rubcllus the 

 girdle sometimes occurs abnormally on segments 26 to 31.] 

 Male or spermiducal pores on segment 15, with or without papilk-e. 

 Tubercula pubertatis occupying four contiguous segments of the clitel- 

 lum, omitting the anterior and posterior rings, and forming a 

 distinct band along or near to its ventral limit. 

 Colour, purplish brown with iridescence, lighter ventrally, and with 



the clitellum paler than the anterior portion. 

 First dorsal pore either between segments 5 and 6, or posteriorly to 

 this. Anus terminal. 

 The internal characters are omitted with a view to preventing the 

 student from being discouraged because he may be unable to dissect 

 his specimens. In all the foregoing points, except those in brackets, 

 the genus Lumbricus differs from A/lo/obophora, so that the two may 

 be readily distinguished. The accompanying chart will enable the 

 young naturalist readily to determine his species if he happens to 

 have found a genuine Lumbricus : and I have added the characters 

 of the new species in the hope that some one will be able to recog- 

 nise it among the indigenous earthworms of Essex. 



Chart of the Genus Lumbricus. 



Seg'ments occupied by the j 



LUMliRICUS 



Girdle. 



Band. 



I. Terrestris, Linn, i 32-37 33,34.35,36 | 



1st 

 Doral 

 Pore. 



2. Rubescens, Friend| 34-39 135,36,37,38! fr 



3. Rubellus, Hoffm. j 27-32 



5,29,30,311 



4. Piirpureus, Risen 28-33 29,30,31,3: 



Papilla?. 



Average , No. of 

 length. 'Segments. 



15,26; 5 inches I 150-200 I 



15,28 4 inches. 12C-150 



3 inches. 



120-150 



2 inches 1 100-120 



I take this opportunity of thanking my correspondents for the 

 assistance they have thus far rendered me, and would like io iiulicate 

 the work which still needs to be done. 



i 



