LUMBRICIDAE 289 



pigmented ; it is improbable that this is due to fading, since specimens of Dendrobaena 

 siibrubiciinda in the same collection are normally pigmented. In this specimen the 

 clitellar bands occupy 128-30. As in the specimens of D. subriibicunda from this 

 locality, the gizzard is restricted to segment 17. In the specimen from Tristan da Cunha 

 this is not so ; it is interesting that the same peculiarity should appear in two different 

 species from the Falkland Islands. 



Genus Lumbricus, L. 



Lumbricus rubellus, Hoffm., f. tristani, nov. 



Tristan da Cunha, under stones near settlements, 31. i. 26; four clitellate, one semi-mature and 

 four immature specimens, the last probably referable to this species (Type and paratypes). 



In the five specimens in which clitellar bands are developed they include segments 

 27-3 1 , instead of the normal 28-3 1 . This peculiarity has not apparently been recorded 

 for this species previously, and its occurrence suggests that the specimens from Tristan 

 da Cunha are to be regarded as a distinct race. In the absence of definite evidence that 

 such a variation does not occur occasionally in this species in Europe or elsewhere, it 

 seems undesirable to create a separate subspecies for the specimens from Tristan da 

 Cunha. 



LUMBRICIDAE InCERTAE SeDIS 



Tristan da Cunha, under stones near settlements, 31. i. 26; one abnormal clitellate specimen, two 

 very juvenile specimens and several fragments. 



Abnormal specimen. Length 73 mm. Diameter at anterior end 2 mm., in region of 

 clitellum 3 mm., posteriorly 1-5 mm. Number of segments approximately 124; an 

 accurate count is impossible on account of the poor state of preservation and the 

 subdivision of segments in the clitellar region. Colour, pigmented dark purple-brown 

 dorsally especially at the anterior end, decreasing in intensity and extent posteriorly, 

 slightly pigmented ventrally on about the anterior 12 segments, clitellum pallid whitish 

 brown. 



Prostomium prolobic. Clitellum on right side including segments 39-47, on left side 

 segments 39-48 ; owing to irregularities of segmentation segment 39 on the left side 

 corresponds to 39 and 40 on the right side, while segment 41 on the right side corres- 

 ponds to segments 40 and 41 on the left side. Clitellar bands on right side 39-^42, on 

 left side 40-46. Copulatory papillae on left side on segments 19 and 25. First dorsal 

 pore 6/7 (?). Spermathecal pores not visible externally; from internal examination the 

 spermathecae open between setal line d and the mid-dorsal line {v. infra). Female pores 

 not visible externally. Male pores on swollen papillae external to seta b, on the right side 

 on segment 19, on the left side on segment 24. Intersetal distances : the setae are widely 

 paired, aa : ab : be : cd : dd = approximately 3 : i : 2 : i : 5 at the anterior end. 



Internal anatomy. Owing to the poor state of preservation it is impossible to give a 

 detailed account of the internal structure. 



Gizzard confined to segment 29. 



Reproductive organs: right side: two spermathecae at intersegments 14/15 and 15/16; 

 two testes and spermiducal funnels, free, in segments 15 and 16; five seminal vesicles. 



