MEGASCOLECIDAE 269 



Genus Eisenia, Malm. em. Mich. 



E. rosea (Sav.), Tristan da Cunha. 



Genus Allolobophora, Eisen em. Rosa. 



A. caligmosa (Sav.), Tristan da Cunha. 

 Genus Deiidrobaena, Eisen em. Rosa. 



D. siibnibicunda (Eisen), Falkland Islands. 



Genus Bimastus, Moore. 



B. tenuis (Eisen), Falkland Islands, Tristan da Cunha. 



Genus Liimbricus, L. 

 L. rubelhis, Hoffm. 



f. tristaui, nov., Tristan da Cunha. 



SYSTEMATIC 



Family MEGASCOLECIDAE 

 Sub-family ACANTHODRILINAE 



Sectio ACANTHODRILACEA 



Genus Microscolex, Rosa em. Mich. 

 Microscolex falclandicus (Bedd.) (Fig. i g-k). 



Acanthodrilns georgianus (part), Beddard, 1890, Quart. Journ. Micr. Sci., N.S., xxx, 4, p. 421, 



pi. xxx, figs. 15, 16, 22, 30, 32-5. 



A. falclandicus, Beddard, 1893, Proc. Zool. Soc. London, 1892, p. 678. 



Notiodrilus falclandicus, Michaelsen, 1899, Ergeb. Hamb. Magalh. Sammelr., Terricolen (Nach- 

 trag), p. 5. Hamburg. 



Notiodrilus falclandicus, Michaelsen, 1900, Das Tierreich, x, Oligochaeta, p. 131. 



Microscolex falclandicus, Michaelsen, 1905, Wiss. Ergeb. d. Schwed. Siidpolar-Exp. 1901-3, 

 Oligochaeten, v, 3, p. 10. Stockholm. 



Teal Inlet, Falkland Islands, 5. iii. 27; six clitellate, ten non-clitellate semi-mature and immature 

 specimens. 



External characters. Length, clitellate specimens, 75-110 mm. Maximum diameter, 

 clitellate specimens, 2f-4 mm. Colour unpigmented, pallid whitish or cream-coloured. 



Prostomium epilobic with or without one or two transverse furrows, rather variable in 

 extent. Clitellum, | or ^13-16 dorsally, extending laterally to setal Hne a, not complete 

 ventrally as described for the type specimens. Copulatory papillae, variously placed 

 paired or median ventrally on segments 16 or 17-20 or 21, sometimes small papillae near 

 the spermathecal pores. Dorsal pores absent. Nephridial pores very slightly below 

 setal line c on the anterior border of the segments, not directly in front of c as described 

 for the types. Female pores paired, in front of and very slightly lateral to the ventral 

 setae aa, on segment 14. Spermathecal pores at intersegments 7/8 and 8/9 in setal line b. 



The other external characters are in essential agreement with those specified for the 

 types. 



