ZooL.— Vol. II.] EISEN—OLIGOCHMTA. Ill 



6. Sperm-ducts with a thick muscular investment near the pore. 



SpermathecEe medium, narrow, cylindrical. Sperm-sacs in IX 

 large, exteriorly hardly lobed. Prostates thick. 



contractus Eisen. 



7. Sperm-ducts not thicker at the pore. No setse ab in XVII. 



One pair of very diminutive prostates. Spermathecse small, 

 pear-shaped, without distinct stalk. Sperm-sacs in IX and XII. 

 Septal glands in V the largest, those in VII and VIII very 

 small. Margins of setce undulating Hendriei Eisen. 



S. Sperm-ducts no thicker at the pores. No setag ab in XVII. One 

 pair of medium size prostates. Spermathecae large, with short 

 stalk. Racemose sperm-sacs in IX and XII. Septal glands in 

 VI the longest. Margins of setae undulating. 



coniondui, sp. nov. 



9. Sperm-ducts not thicker at the pores. No setae «6 in XVII. One 

 pair of diminutive prostates. Spermathecce large, with dis- 

 tinct stalk. Racemose sperm-sacs in IX and XII. Septal 

 glands in VII the longest. Margins of setae smooth. 



santi xavieri, sp. nov. 



10. Sperm-ducts not thicker at the pore. No setse ab in XVII. 



One pair of prostates in XVII, and one pair in XVIII. Margins 

 of setae undulating timicola Eisen. 



11. Sperm-ducts not thicker at the pores. No setas ab in XVII. 



One pair of large prostates in XVII. Setae with even margin, 

 but with a lunate cavity at apex. Spermathecje medium sized, 

 constricted transversely at centre. Racemose sperm-sacs in IX 

 and XII .paraguayensis Rosa {40). 



12. Sperm-ducts not thicker at pores. No setae ab in XVII. Setse 



with even margin. One pair of small prostates. Racemose 

 sperm-sacs in XII only. Septal glands in VI the largest. 



niexicanics, sp. nov. 



13. mexicamis var. hawaiiensis var. nov. 



14. Sperm-ducts not thicker at the pores. No setae ab in XVII. 



Sets with even margin. One pair of large prostates open on 

 a very large pair of papillae. Racemose sperm-sacs in IX and 

 XII. Septal glands in V the largest. Spermathecae stalked, 

 sac large, globular, and as wide as two ordinary somites. 



tuber cutatus, sp. nov. 



15. Sperm-ducts not thicker at the pores. No setae ab in XVII. 



Male papillae large, surrounded by glandular protuberances pro- 

 jecting beyond XVII. Prostates large, extending to XXX. 

 Spermathecae stalked, the stalk with a slight local, lopsided 

 bulging out of the lumen. Racemose sperm-sacs in IX and 

 XII Calwoodi MicHAELSEN {27). 



16. Sperm-ducts not thicker at the pores. Setae a absent in XVII. 



Spermathecae as well as prostates are very large. 



Beddardi Eisen. 



