236 



DR. W. B. BENHAM ON 



[Nov. 15, 



as the postgenital tubercle; further, the pair are connected 

 across the middle line by a transverse ridge. 



A single pair of spermathecal pores at the groove 8/9. 



Text-fiff. 56. 



Text-fig. 55. 



-TP. 



Text-fiff. 57 



A. B. 



Text-fig. 55. Rliododrilus besti. — Ventral view of the clitellar segments, &c. 

 ( X about 5), showing porophores and arrangement of the tubercula pubertatis 

 (T.P.). 



Text-fig. 56. BJiododrilns hesti. — An enlarged view of one of the tubercula puber- 

 tatis, showing the glandular depression centrally, and also the fact that it is on 

 the hinder anuulus of its segment, though apparently intersegmental. 



Text-fig. 57. Rliododrilus hesti. — Portion of prostate, showing shortness of duct, as 

 compared with that of R. edulis. 



Internal Anatomy. 



There are stout septa behind segments 7 to 12. The gizzard is 

 large and occupies segments 5 and 6. The spermiducal glands 

 are long, undulating, tongue-shaped, extending into the 24th 

 segment. The prostrate duct is short, narrow, and only slightly 

 cm-ved (text-fig. 57). 



The sacs of penial chsetse extend from segments 17 to 21. Each 

 penial chseta (text-figs. 58-60) is much slenderer than in the 

 preceding species, and larger and of a different form ; it is gently 

 curved and the blunt point is bent in the opposite direction ; 

 here it is flattened and slightly excavated, so as to be spoon- 



