AN ATTEMPT TO CLASSIFY EAETHWORMS. 245 



The clitellum, complete, covers Somites xiii to xvi (xvii). 



The male pores are in Somite xvii. 



Sperm-sacs, testes, ovaries, as in preceding genus. 



The prostates lobate; penial setse present. 



The nephridia commence in Somite iv ; nephridiopores 

 in front of the third seta. 



There is no gizzard, no typhlosole, no subneural vessel, nor 

 dorsal pores. 



[Small, transparent ; white clitellum. 



One pair of spermathecse in Somite ix.] 



Species 1. M. modestus, Rosa; Italy. 



See Rosa, 'Boll. Mus. Zool. ed Anat. Comp. Univ. Torino/ 

 ii, 1887, and iii, 1888. 



Genus 18. Rhododrilus, Beddard, 1889. 



The setse separate, in eight series. 



The clitellum occupies Somites xiv to xvii. 



The prostates are tubular; penial setse present ; the male 

 ducts open independently of the prostates — all in Somite xvii. 



The sperm-sacs in Somites xi, xii. 



Prostomium incompletely dovetailed into the peristomium. 



[Spermathecse. — Four pairs, in vi, vii, viii, ixj each with 

 appendix. 



A gizzard is present in Somite v. 



No caiciferous glands. 



Nephridiopores in front of third seta. 



Dorsal pores are present.] 



Species 1. R. minutus, F. E. B. ; New Zealand. 



See Beddard, ' Proc. Zool. Soc.,' 1889. 



Genus 19. Plutellus, E. P., 1873. 

 Setse eight, equidistant. 



The clitellum covers Somites xiv to xvii, complete ven- 

 trally. 



The male pores on Somite xviii. 



Oviducal pores on Somite x (?). 



The nephridial pores in line alternately with seta^ two 



