272 FRANK E. BEDDAED. 



any other genus. The worms, of which I had about half a 

 dozen specimens, measured two inches or so in length. The 

 colour was evidently entirely lost in the process of preserva- 

 tion ; but it appears that little or no integumental pigment is 

 present. 



§ External Characters. 



In the disposition of the setae this worm resembles the 

 genera Heliodrilus or Hyperiodrilus (which Michaelsen 

 would unite in one genus), Paradrilus, and Preussia. The 

 setse are paired, but the two setae of the ventral couples are 

 much further apart than are the two setae of each dorsal couple, 

 which are strictly paired ; the setae are, in fact, arranged pre- 

 cisely as in the genera above mentioned. There was nothing 

 peculiar about their form that I could find. They tend to 

 disappear upon the clitellum. 



The most striking external character was exhibited by the 

 male reproductive apparatus (fig. 23) ; the opening of the atria, 

 a single pore, was upon the border line between the 17th and 

 the 18th segment; it was marked by a slight protuberance of a 

 hemispherical form. From this a groove, bordered by a raised 

 margin on each side so as to form a trough, ran forward up to 

 the 14th segment in one case, to the 15th in another; at the 

 boundary line between Segments 15 and 16 this groove became 

 divided into two at an angle of nearly forty-five degrees ; the 

 two grooves end in a rounded prominence ; these no doubt serve 

 the purpose of penes. The existence of these penial processes 

 ought, perhaps, to have led me to refer the genus to my genus 

 Hyperiodrilus or to Stuhlmannia, but in the present 

 species the sperm atothecal orifices are further forward than in 

 either of the two genera mentioned ; they lie, in fact, upon 

 the 10th segment, whereas in both Hyperiodrilus and 

 Stuhlmannia these pores are upon the 13th segment. The 

 oviducal pores, as in all Eudrilids with the remarkable ex- 

 ception of Libyodrilus (not an exception if we go by in- 

 ternal segmentation), lie upon the 14th segment. 



The variability in position of the penes, though remarkable. 



