DESCRIPTIONS OF GENERA AND SPECIES 615 



(2) Preussia lundaensis, Michaelsen. 

 p. (?) lundaensis, Michaelsen, Arch. f. Nat., 1891, p. 219. 



Definition. Length, 90 mm.; breadth, 4^ mm.; number of segments, 193. No gizzard. 

 Penial setae armed at extremity with fine hooks. Hah. — Lunda, W. Africa. 

 As Michaelsen only examined a single immature example of this species, its 

 systematic position is a matter of doubt; it agrees with the other species in the 

 arrangement of the setae, in the position of the spermathecal orifice and in the 

 hollow penial setae, which are, however, in the present species provided with booklets 

 at the free end, disposed at right angles to the shaft of the seta. 



Genus Paradbilus, Michaelsen. 



DEFINITIOI3'. Setae paired, ventral being a little further apart than dorsal. 

 Clitellum complete, XIII-XVIII. Calciferous glands in XII ; ventral pouches. 

 Male pore on XVIII. Spermathecal orifice on XII, the spermathecal sac 

 consists of median pouch opening on to XIl/XIII; with this are connected 

 two lateral sacs opening above on to gut, a pair of glandular diverticula exist, one 

 to each of ovarian ducts. Sperm-ducts open into dilated chambers before funnels. 



In spite of the careful work which has been done by both Michaelsen and Rosa 

 upon this genus, a good deal yet remains to be made out before the systematic 

 position of the genus can be decided. It is not known whether the integumental 

 sense organs are present, and it is not certain whether the ventral median calciferous 

 pouches exist as in the allied genus Polytoreutus ; I say 'allied' because the 

 arrangement of the setae recalls that genus, and, as has already been pointed out, 

 a comparison can be made between the, at first sight, diverse spermathecal sacs 

 of both. Another matter that requires clearing up is the structure of the female 

 reproductive organs in the various species ; the figures which Michaelsen gives of 

 these organs in P. ruber, and in P. purpureus show some differences from P. rosae. 

 In both of the former species Michaelsen has figured the sac as ending behind in 

 two branches which open into the gut; on the contrary, in P. rosae, Rosa has 

 figured and described the lateral diverticula of the sac as arising near to its external 

 pore, and running close to it as far as the point where they diverge to open into 

 the oesophagus; nor is the nature of the glandular appendix of the ampulla upon 

 the ovarian duct quite understood ; as to the opening into the gut this was first 

 clearly proved by Rosa, though Michaelsen figured these tubes with open ends ; he 

 thought, however, that they met above the gut as in Stuhlviannia. 



