278 



Transactions of the Society. 



wards orange and brown cells are intermixed as in aurantiaeus. 

 Nephridia very large, quite unlike those of 'pa2jillosus. Brain 

 slightly concave behind. Spermathecae pear-shaped sacs without a 

 distinct duct (fig. 48). Resembles nervosus in the expansion of the 

 nerve in the front segments. No penis-sheath,* but the aperture of 

 the male organs widening into a sac as in jJa'piUosiis (fig. 49), which, 

 in certain aspects, looks almost like a second spermatheca behind 

 the true one. 



Found in mud collected for me by Mr. C. Todd, in the Eiver 



) 



Fig. 47. 



Pig. 48. 



Fig. 49 



Lea at Tottenham, September 30, 1911. It closely resembles a 

 Marionina or Pachydrilus at first sight. As it was found in company 

 with L. papillosus Fr,, L. galeritus Fr., and others, it was easy at a 

 glance to see how different it was from every other species as yet 

 recorded for Britain. 



11. Limnodrihis galeritus sp. n. 



Length about 20 mm. Chloragogen cells begin in the fifth seg- 

 ment. Setae 4 in dorsal and 5 in ventral bundles from segments 



Fig. 50. 



Fig. 51. 



2-7, then usually 3 per bundle. Teeth equal in posterior segments ; 

 outer tooth somewhat largest in front segments (fig. 50). Very 

 long, stout, striated duct to sperm-funnel. The penis-sheath 

 slightly bent at the distal end behind the funnel. Shaft very 

 slightly wider at the proximal end than at the bend. Funnel three 

 times as wide as shaft, the length being about 15 times that of the 

 breadth. The setae are one-sixth the length of the penis-sheath. 



* See under No. 8 {L. papillosus), p. 276. 



