1887.] 



NEW GENUS OF LUiMBRICID^. 



157 



clitellar segments are thus modified. This latter statement I am 

 able to confirm from the study of an Austialian species of the genus, 

 possibly identical with Horst's species. But the modification of the 

 setae in the cHtellar region of Thamnodrihis is more complete than 



Fig. 3. 



?;*. 



Fig. 2. Thamnodrilus gttlielmi. Anterior segments seen laterally ; apertures of 

 the nephridia in front of the dorsal pair of setse ; segments of clitellum 

 shaded Tertieally. Magnified twice natural size. 



Fig. 3. Seta from one of the segments of the clitellum ; highly magnified. 



in TJrochcEtay inasmuch as it has affected the dorsal as well as the 

 ventral pairs. The clitellar setse are larger than the ordinary setse, 

 as well as differing in their ornamentation ; this difference was very 

 noticeable in an immature example, whei'e the difference of age alone 



