British Eachytrivids. By Rev. H. Friend. 269 



behind the girdle. Large for the size of the worm, none on the 

 girdle segment. Internally we find the brain longer than broad, 

 Henlean in character, i.e. about IJ x 1, incised behind, narrowing 

 anteriorly. Salivaries (fig. 33) with spathulate posterior, large, in 

 segment 4/5. Ccelomic corpuscles large, cigar- 

 shaped in profile, oval to round, not horny-looking 

 as in some species. Three pairs of septals. Sper- \ \ 



mathecffi with pear-shaped ampulla about the ) ^ 



length of the duct, with no glands at 4/5 opening. 

 JS'o bulb-like enlargement of intestine, no ceso- 

 phageal glands. Dorsal vessel arising in 7/8, 

 between the last pair of septal glands and the 

 intestine. Large sperm-duct arranged like coils 

 of vermicelli, extending back to segment 15 or 16, 

 and attached to small ampulla, about 2-3 X 1. 

 Large nephridia beginning in 7/8, with small g^^. ^^^' l^' . 

 slender anteseptal and large postseptal from the jg-. minuta. 

 forepart of which a stout duct, about equal thereto, 

 proceeds. Pore of nephridia very clearly seen. 



This species approaches H. rosai, H. curiosa, and H. attenuata. 

 From the latter it is distinguished by the number of setae, the 

 different ccelomic corpuscles, and the shape of the nephridia, as 

 well as by the absence of oesophageal glands. From H. curiosa it 

 is at once distinguished by size, nephridia, and spermathecte ; 

 while the nephridia and the setae distinguish it from R. rosai. 

 The differences may be set forth in the following way : — 



A. Salivaries present ; no oesophageal glands. 



(i) Nephridia without separate duct. Spermathecae with 

 ampulla near the middle. 



a. Length 20 mm. Segments 55-60. Setae 4. 



H. curiosa. 

 /3. Length 5 mm. Segments 25-30. Setae 5-8. 



If. rosai. 



(ii) Xephridia with separate duct. Spermathecae with 

 ampulla joining intestine. 



a. Length 5 mm. Segments 30-35. Setae 4. 

 H. minuta. 



B. Salivaries present ; one pair oesophageal glands. 



a. Length 6-10 mm. Segments 35-40. Setae 

 3-5. H. attenuata. 



Collected by the Boat-house, Sutton Broad Laboratory, August 

 25, 1911 ; the mould being kept in a tin till June, 1912, when 

 this species was found mature, though not observed during my 

 investigation of the material at the Laboratory. 



