564 WILLIAM BLAXLAND BENHAM. 



Another point of difference is presented in the absence of the 

 strands of connective tissue, which in Lumbricus separate the 

 club-shaped cells into more or less distinct groups. I think that 

 there can be no doubt that the clitellum is present ; but as it 

 commences and ends gradually, and since, from Orley's remarks 

 and from HoflFmeister's drawing, there is no difference in 

 colour in the living worm, it may easily be overlooked in this 

 condition. 



The anus is situated quite dorsally (fig. 11), on an enlarged 

 somite, which Vejdovsky considers as representing some seven 

 or eight fused somites, as indicated by the ganglionic swellings 

 figured in pi. x, fig. 21, of his work. 



The pore of the sperm-duct is placed on a large hemispherical 

 papilla, or swelling, on somite xv, between the ventral and 

 dorsal setae, which Orley speaks of as " der Hof,^^ and which I 

 have translated as " areola." It is, in the sexually mature 

 worm, very conspicuous, and has caused, in spirit specimens, 

 the lateral swelling shown in PL XXXVIII, figs. 9, 10. 



The pore of the oviduct is similarly placed in somite xiv, 

 but on a much less prominent papilla. Both these pores are 

 visible from the side (fig. 13) ; and near them are usually one 

 or more white spermatophores. These are fully described in 

 the preceding paper, but whereas Orley states that they are 

 generally fixed close to the ventral setse, the specimens exa- 

 mined by me show them nearer the dorsal setae ; at the same 

 time I do not intend by this, nor by my figure, that it should 

 be inferred that Orley is in error : he has had much greater 

 opportunity for observation than I have, and my figure was 

 drawn some weeks before I saw his paper. 



I have been unable to see the nephridia pores, and there are 

 no dorsal pores. 



The four couples of setae are set at the corners of the animal, as 

 shown in fig. 11, and are perfectly evident throughout the body, 

 including the clitellum. They are usually broken off short, so 

 that I was unable to extract them ; but in sections they are seen 

 to have the ordinary shape (Vejdovsky, pi. xiii, fig. 13). 



Internal anatomy. — The alimentary tract differs from 



