46 



or absence of an albumen gland as the basis for the separation 

 of the Liniihriniiida' into two groups, but without presenting 

 any reason for believing that such a character should be con- 

 sidered of especial importance in determining systematic rela- 

 tionships, and I am disposed to assume that it has at the most 

 no greater significance than that of a specific character. 



Positions of Spermiducal Pores and Gonads. — The spermidu- 

 cal pores are usually on VIII in L. rarief/afits, but Vejdovsky 

 (1895) found them on VII in one specimen. Wenig found but 

 one spermiducal pore in each of the specimens examined by 

 him, and that on VIII. In L. inronsfti/is the spermiducal pores 

 are on X in two of the specimens studied and on XI in another. 

 In the two species of Trichodriius they are on X. With such 

 individual vai-iability in mind, it seems reasonable to consider 

 the position of the spermiducal pores as of no more than spe- 

 cific importance. In L. rariajatns there is one pair of testes and 

 one pai)' of spermiducal funnels in VIII, and there are two pairs 

 of ovaries in IX and X. In L. inronsfans there are two pairs of 

 testes and two pairs of spei'miducal funnels in IX and X, and 

 two pairs of ovaries in XI and XII. In the European species 

 of Trichodriius there is uncertainty about the testes. There are 

 two pairs of spermiducal funnels in IX and X and one pair 

 of ovaries in XI. With reference to the position of the gonads 

 our species is nearer to Tricliodriliis. while in respect to the 

 number of ovaries it is )nore like L. raricijatiis. 



We will next consider several important respects in which 

 L. rnconsfnns more closely resembles L. raricf/afns than it does 

 the European species of Trirliodri/iis. 



Sefii'. — In L. rariryafiis and L. innnistiuis the setie are cleft; 

 in Trichodriius they are simple. While it is true that in some 

 lumbriculid species the seta^ may be partly simple and partly 

 cleft, yet to my knowledge there has been no occasion for 

 placing in the same genus species with setae all simple and 

 other species with set* all cleft, except in the genus Tricho- 

 driius as defined by Michaelsen (1900. p. 58) in order that it 

 might include the species inronsfans. 



