616 OLIGOCHAETA 



(t) Paradrilus rosae, Michaelsen. 

 p. Rosae, Michaelsen, JB. Hamb. wiss. Anst., viii, 1891, p. 26. 



Definition. Length, 370 «m.; breadth, to mm. ; number of segments, 350. Ptnial setae 

 furnished at extremity with two wing-like processes, on which are fine granulatiotis. 

 Hob. — Fernando Po, Barombi, W. Africa. 



This species has been carefully studied by both Michaelsen and Rosa (35) ; it 

 is possible that there are other characters than those mentioned in the above 

 definition which distinguish it from the other species. Neither Rosa nor Michaelsen 

 say anything about the ventral unpaired calciferous pouches described by the latter 

 in P. purpureus. Septa iv/xiii are thickened (Rosa says iv/vi and viii/xii). 



(2) Paradrilus ruber, Michaelsen. 



P. ruber, Michaelsen, Arch. f. Nat., 1891, p. 220. 



Definition. Length, 360 mm. j breadth, 10 mm. ; mm-ber of segments, 286 (about). Penial 

 setae flattened at extremity, and firnished with two rows of longish spines. Hab.-- 

 Togo Land, W. Africa. 



There are some other small differences between this species and the last; the 

 prostomium is not continued on to the buccal segment, but it is triangular behind 

 and fits into a depression on that segment. In front and behind the male pore is 

 a crescentic furrow. Michaelsen speaks of an aperture on the fifteenth segment, 

 which, however, did not show any connexion with any organ in the interior of the 

 body. Septa x/xii are much thickened. 



(3) Paradrilus purpureus, Michaelsen. 



p. purpureus, Michaelsen, loc. cit., p. 222. 



Definition. Length, 'iio mm. ; breadth, 7 mm..; nnmber of segments, 178. Penial setae 

 absent. Hob. — Barombi, W. Africa. 



The most obvious distinguishing mark of this species is the total absence of 

 penial setae. The prostomium is as in P. rosae. The septa vii/xii are specially 

 thickened. 



