FRIEND : NEW AND LITTLE-KNOWN OLIGOCH^ETS. 



MS 



segment vi. and distinguished by the dark chloragogen ceils. First 

 nephridium in segment vii. The arrangement of the bloodvessels 

 can be well studied in the living worm on account of the light colour 

 and transparent character of the anterior portion of the body, 

 contrasted with the bright red colour of the blood. I cannot agree 

 with Dr. Benham that the spermathecae lie entirely in segment ix. 

 Before I had seen his description I had figured a specimen from 

 Lodore in which they extend, as in St. gabreta^ right into segment x. 

 The dorsal vessel is seen to pulsate in segment vi. As no allusion 

 is made to the brain by either Benham or Beddard I give a diagram- 

 matic figure, together with copies of Benham's drawings to represent 

 the head and the girdle segments with the penes. I do not find the 

 head so pointed as Benham represents. 



Fig. i. Stylodrilus vejdovskyi. Segments X-XL, ventral surface, showing 

 ventral setae (?j.s.) and penes (pe.). 



Fig. 2. Head of same, ventral surface, showing prostomium, with mouth, 

 buccal segment or peristomium and first setigerous segment, after Benham. 



Fig. 3, Dorsal view of same, showing brain {dr.) :m<) dorsal blood vessel 

 (</■#.), from camera lucida drawing. 



■ 



2. Tubifex rivulorum Lamarck. What Lumbrkus terrestrts 

 has long been among the terrestrial forms, such is Tubifex among 

 the limicoke. Any earthworm was formerly put down under the old 

 name, and we have only now, after years of debate, come to a clear 

 understanding respecting the real characters of Z. terrestrts. But 

 we are still in the clouds respecting Tubifex. Is it one worm or many, 



n d is it a Tubifex at all 

 Wx, Sa/ruris, Blanonais 



May J806. 



It has been described as Lumbrkus, 



run 



K 



