147 



VI. — Alien Oligochivts in England. 

 By The Kev. Hilderic Friend, F.E.M.S. 



(Bead January 19th, 1916.) 

 Figs. 1-6. 



Kerria rubra sp. n. 



Whenever plants introduced from abroad have soil attached to 

 their roots there is the possibility that young worms or cocoons 

 may be present. Under suitable conditions these may develop, 

 and in time become prolific. It is reasonable to suppose that in 

 many cases the young die, and the cocoons fail to yield up living 

 forms ; but we have a number of records, based on more or less 

 careful observation, to show that not a few alien Oligochcets have 

 during recent years found their way to this country. Kew is 

 naturally the place where the largest number of aliens have been 

 found, and both Beddard and myself have placed on record at 

 various times the results of our work on the Annelids of Kew 

 Gardens. Elsewhere the species which have been most frequently 

 reported are Pheretima {Pericha'ta) indica Horst, which is, as 



EXPLANATION OP FIGURES. 

 The Eoman numerals refer to the numher of the segment. 



Fig. 1.— Transverse section through segment 7, showing the arrangement of the 



setae, thickened septa, glands, oesophagus, and nephridia. 

 „ 2. — Longitudinal vertical section through segments 8-15, showing gonads, 



oesophageal glands, girdle, and extended intestine. 

 ,, 3. — Longitudinal section through spermathecEe. 

 ,, 4. — Transverse section through segment 9, with glands opening into the 



oesophagus. 

 ,, 5. — Longitudinal section through the anterior portion, to illustrate the shape 



and position of the hrain. 

 ,, 6. — Longitudinal section through girdle segments, with prostates and male 



pore. 



Abbreviations : — at. attachment of brain ; b.c. buccal cavity ; br. brain ; 

 h.v. blood-vessel ; d. dorsum ; d.v. dorsal vessel ; gir. girdle : int. intestine ; int.e. 

 intestinal enlargement ; l.s. lateral seta; ; m. muscle ; m.p. male pore ; n.c. nerve- 

 cord; nep/i. nephridium ; fes. oesophagus ; ccs.gl. oesophageal gland ; o./. funnel 

 of oviduct ; os. ovisac ; ov. ovary ; ph. pharynx ; p.p. prostate pore ; pr. pro- 

 stomium ; ps. prostates ; sep. septum ; sep.gl. septal gland ; s.f. sperm-funnel ; 

 sps. sperm-sac ; spth. spermatheca ; t. testis ; v. %'enter ; v.s. ventral setce ; 

 v.v. ventral vessel. 



