288 DISCOVERY REPORTS 



Family LUMBRICIDAE 



Genus Eiseniella, Mich. 



Eiseniella tetraedra, f. typica (Sav.). 



Tristan da Cunha, under stones near settlements, 31.1.26; two clitellate and one immature 

 specimen. 



Genus Eisenia, Malm. em. Mich. 

 Eisenia rosea (Sav.). 



Tristan da Cunha, under stones near settlements, 31. i. 26; three mature or semi-mature speci- 

 mens ; two immature specimens probably referable to this species. 



Genus AUolobophora, Eisen em. Rosa 

 Allolobophora caliginosa (Sav.). 



Tristan da Cunha, under stones near settlements, 31. i. 26; two immature specimens probably 

 referable to this species. 



Genus Dendrobaena, Eisen em. Rosa 



Dendrobaena subrubicunda (Eisen). 



Falkland Islands, Teal Inlet, 5. iii. 27 ; four clitellate specimens, two with clitellar bands, and eight 

 immature specimens. 



Clitellum including segments 26, ^26, or 27-31. Clitellar bands including segments 

 28 or §28-30, ca. I31 or 31. In most specimens the gizzard is either confined to 

 segment 17 or extends very slightly into 18 ; in one specimen it extends as far as .^18 and 

 in another to as much as f 18. This restriction of the gizzard to one segment has not been 

 recorded before in this species. Its occurrence in these specimens serves further to show 

 that the distinction, based on this character, which separates Eiseniella from the other 

 Lumbricid genera is not by any means definite (see Stephenson^ for a discussion of this 

 subject). 



In all but two specimens there are two pairs of spermathecae normally situated, in 

 segments 9 and 10 at intersegments 9/10 and lo/i i. In two immature specimens there is 

 only one pair in segment 9 at intersegment 9/10. Since both pairs are visible as rudi- 

 ments in other equally immature specimens it seems certain that these two specimens 

 are abnormal in this character. 



Genus Bimastus, Moore 

 Bimastus tenuis (Eisen). 



Tristan da Cunha, under stones near settlements, 31. i. 26; one clitellate specimen, three im- 

 mature specimens probably referable to this species. Falkland Islands, Teal Inlet, 5. iii. 27; one 

 clitellate specimen. 



The clitellate specimen from Tristan da Cunha appears to be quite normal except 

 that the clitellar bands occupy three segments (28-30) instead of the more usual number 

 2 (29-30). The specimen from the Falkland Islands is peculiar in that it is quite un- 



1 Stephenson, J., The Oligochaeta, Oxford, 193 1, p. 908. 



