DESCRIPTIONS OF GENERA AND SPECIES 595 



genus Notykus will correspond, not to the sac of Nemertodrilv^, Stuhlmannia, &c., 

 but to the true spermathecae of other families of Oligochaeta. As, however, in any 

 case the description of the organs given by MICHAELSEN is incomplete, it is perhaps 

 not very useful to do more than record the known facts. 



The male organs show no remarkable differences from those of other Eudrilidae ; 

 the two spermiducal glands open by a common muscular Bursa copulatrix, with which 

 also communicate two sacs containing penial setae. There is only a single pair of 

 sperm-ducts, with their funnels, and presumably only a single pair of testes to 

 correspond. 



The gizzard as in so many genera lies in segment v ; nothing is said as to the 

 presence or absence of calciferous glands, &c. 



Notykus emini, MICHAELSEN. 

 N. Emini, MICHAELSEN, JB. Hamb. wiss. Anst., ix, 1891, p. 32. 



Definition. Length, ioom>i?.; breadth, 4-4^ mm. ; number of segments about 108. Septa 

 Y/X thickened. Penial setae with numerous wart-like processes on the distal extremity. 

 Had. Longa, E. Africa. 



This species is, after preservation in alcohol, greyish to dark brown ; the absence 

 of all traces of nephridiopores may mean that, as in Libyodrilus violaceus, there is 

 a system of integumental nephridial tubes. 



Genus PAREUDRILUS, BEDDARD. 



DEFINITION. Setae paired. Male pores paired on XVII/XVIII. Spermathecal 

 pores paired on XIV/XV. Ovarian sac large, communicating with sperma- 

 thecal sac ; egg-sac not communicating with spermathecal sac. Spermiducal 

 glands with thick muscular walls; penial setae very long. 



This genus of Eudrilidae, as is the case with so many others, has but one species, 

 which is a native of East tropical Africa. It is one of the very few genera in which 

 the reproductive organs are paired with paired orifices. The most remarkable feature 

 of the genus is the fact that the ovaries appear to be enclosed in sacs, but that the 

 egg-sacs are not related to the spermathecal sacs, as are the ovarian sacs No other 

 genus shows this combination of characters. 



4 G 2 



