AN ATTEMPT TO CLASSIFY EARTHWOEMS. 265 



EcHiNODRiLUs, Vaillant, 1869 ( = L. multispinus^ Grube, 



1851). 

 Setse four bundles of 5 in each somite. 

 Clitellum absent. 

 Spermiducal pores in Somite xii. 



Anteus, E. p., 1872. 



Setse four couples. 



Clitellum ill-defined, on Somites xv to xxix. 



Spermiducal pores unknown. 



Sperm-sacs, two pairs, in Somites ix, x. 



Gizzard, Somite vi. 



Nepbridia large; pores in line with outer setse. 



Anterior septa very thick. 



Vaillant points out that in many respects Perrier's descrip- 

 tion agrees with that given by Beddard and myself for Micro- 

 chseta rappi. Size: Anteus, 1'16 m. (i.e. 45 inches); 

 Microchaeta is 3 feet 6 inches to 6 feet. 



The arrangement of setse and indistinctness of the clitellum 

 are also points of resemblance. To show the difficulty of 

 deciding where the clitellum commences in Microchseta, it 

 is noteworthy that whereas Beddard puts the extent of this 

 structure as Somites x to xxx inclusive, I reckoned it as 

 occupying Somites xiii to xxv. 



Both Beddard and I were unable to recognise the spermi- 

 ducal pore externally. 



The aunulation of the somites rendered it difficult to count 

 them ; thus Beddard figures the gizzard in Somite vii, whilst 

 I found it to be in Somite vi. He states that the spermi- 

 ducal pore is on Somite xviii ; I found it to be on xix. 



In both Anteus and Microchseta the anterior septa are 

 especially thick and infundibuliform. Perrier places the last 

 of these tbick septa behind Somite ix ; Beddard places it in 

 Microchseta behind the eightb, and I found it behind the 

 seventh. These discrepancies are no doubt due to the diffi- 

 culty of counting the somites. 



A nephridium of Anteus is figured by Perrier. He repre- 



VOL. XXXIj PART II. NEW SER. S 



