310 EEV. H. FEIEND ON A 



Dr. Eosa has called my attention to the fact that a worm was 

 imperfectly described some years ago under the name of i. fes- 

 tivus, Savigny, in which the girdle segments occupy the same 

 position as that indicated for L. rubescens, Friend. The other 

 characters, however, are too little known to justify the inclusion 

 of the name here. 



i\s by the discovery of this worm a slight alteration in the 

 generic characters of Lumhricus is made necessary, I shall here, 

 in the first place, emend the recently-published analysis of Ben- 

 ham *, and then describe the different species at present known 

 to occur indigenously in Grreat Britain. A list of synonyms may 

 then very properly be appended. The revision relates only to 

 our native species, but will apply to those found abroad as well. 



A Bevision of the GeJius Lumbricus, Linn. 



Prostomium forming with the peristomium a perfect " mortise 

 and tenon." 



Setge 8 in each segment, always in couples, the individuals of 

 which are in close proximity. Those on the clitellum, and on 

 certain other segments, differing by their greater length, never 

 ornamented. 



Clitellum always composed of six segments, commencing some- 

 where between segments 26 and 34. 



Male or spermiducal pores on segment 15, either with or with- 

 out papillae. 



Sperm-sacs, or vesiculse seminales, three pairs in segments 9, 

 .1 1, 12, connected across the middle line by sacs enclosing the 

 testes and ciliated rosettes. Testes in segments 10, 11, ovaries 

 in segment 13. 



Spermathecge in segments 9 and 10, two pairs opening pos- 

 teriorly. 



Grizzard in segments 17-18. 



Calciferous or oesophageal glands in segments 11, 12. 



Nephridia simple, meganephric, in pairs in each segment except 

 the most anterior. 



Tubercula pubertatis, four on each side, forming a band along, 

 or near to, the ventral limit o£ the clitellum, oraitting the first 

 and last segments. 



* " An Attempt to classify Earthworms," in Q. J. M. S. vol. xxxi. 1890, pt. ii. 

 pp. 258-9. 



