94 Mr. F. E. Beddard on a 



ding the male iwres. NephricUa paired, and after the first 

 few surrounded hy a thick mass of peritoneal cells. AUmea- 

 tary canal with a single median ventral diverticulum in seg- 

 ment IX. ; gizzard generally absent ; intestine without typhlo- 

 sole. No suhnervian vessel ; two pairs of stout hearts in ic., 

 xi. Testes in x., xi., or x. only; atria tivo pairs [or one 

 pair), loith an epithelial lining only one cell thicic opening on 

 to two consecutive segments / vasa deferentia opening indepen- 

 dently of atria ; ovaries in xiii. ; spermatothecje. two pairs [or 

 one pair) in vii., viii., with no diverticula, or at most rudi- 

 mentary diverticula. No penial setoi. 



1. Gordiodrilus tenuis, sp. n. 



Ventral setce much larger than dorsal. Clitellum xiv.- 

 xxvii. Male pores on xx. and xxi. One pair of testes. 



2. Gordiodrilus robustus, sp. n. 



Male pores on xvii. and xviii. A median genital papilla 

 on xix. Gizzard present. 



3. Gordiodrilus elegans, sp. n. 



Male pores on xviii. and xix. Clitellum xiii.-xix. Sper- 

 matothecce loith rudimentary diverticula. 



4. Gordiodrilus ditheca, sp. n. 



Male po?'es on xviii. only. One pair of s])ermatothec(e in 

 vii.j without diverticula. 



5. Gordiodrilus dominicensiSj sp. n. 

 Male pores on xviii. and xix. No spermatothecce. 



The following table shows the principal resemblances and 

 differences between the five species : — 



