British TuUficidfe. By Rev. H. Friend. 273 



readily distinguished from L. lioffmeisteri Clap, by the length of the 

 penis-sheath. While this is not the case, we find no difficulty in 

 distinguishing them if we study them side by side. The colour, 

 length, shape of setfe, and extent of pharynx are then conclusive. 



L. hoffmeisteri L. claparedeianus. 



Length 20-50 mm. 50-80 mm. 



Colour Brownish Light red 



Cuticle Thin Thick 



Setfe Teeth nearly equal Upper tooth longest 



Pharynx To 3rd segment To 5 th segment 



Penis-sheath 4-12 x 1 8-10 x 1 



This species does not seem to have been often observed in 

 Great Britain, as not one of the usual authorities, including 

 Southern, refers to it. I have taken it in a few localities, notably 

 at Kew Gardens, in August of the year 1911, where it was in- 

 termixed with L. lid'pillosus, and others. It is possible, however, 

 as Bretscher and Piguet have pointed out, that there may be con- 

 fusion here with the next species. 



■4. Limnodrilus longus Bretscher. 



Chloragogen cells begin in fifth segment. Setce in front 

 bundles number 5. Penis-sheath either straight or slightly bent, 

 upwards of 20 times longer than broad, extending through seg- 

 ments 10-12. 



1901. — Revue Suisse de Zoologie, ix. p. 204, with two figures 

 showing straight and curved penis-sheath. Bretscher's definition 

 is meagre. Southern says : — " This species is distinguished by the 

 comparative length of the penis-sheath. In the Irish specimens 

 the length was 21 times the breadth. Bretscher gives 20 to 1 as 

 the proportion. The sheath has a broad and shallow funnel-like 

 expansion at the distal end. The anterior nephridia are enveloped 

 in bladder-like cells. The length is 20-25 mm., and there are 

 4-7 setse in the anterior bundles." 



I first found it around Malvern, but this year specimens sent 

 me by Mr. Todd from Tottenham have supplied me with the follow- 

 ing facts. Length about 1 inch (20-25 mm.), segments 90, head 

 small and pointed. Setae 4-6, or 7 in front bundles ; teeth about 

 equal, quite unlike those of L. udekemianus ; rather slender. In 

 the posterior bundles the number dwindles to 3 and 2, while the 

 teeth are wider apart. Penis-sheath very long. My camera-lucida 

 drawing gives length as 120 to 6 = 20 X 1, with funnel at distal 

 end represented by 11, or nearly twice the width of the proximal 

 end, where the penis is clearly seen in the sheath. Duct by far the 

 longest I have yet observed, with large pyriform prostate. Brain 

 varying in appearance, but not deeply lobed or incised as in some 



