SOME GERMAN ENCHYTBMIDS. 393 



which it is impossible to name with certainty, as the sperma- 

 thecae were not developed. The available evidence related it 

 more closely to paroniana (8) than to any other member of the 

 group. Length of the young Worm 3 mm., segments 30, with 

 yellowish intestine. Setae 2 per set throughout. Three pairs of 

 septal glands ; salivary glands unbranched, extending to the 

 septum 4/5. First nephridium in 6/7, duct arising from the 

 middle of the postseptal portion. Large ccelomic corpuscles. 

 Full of parasites, which rendered the creature fragile, and caused 

 it soon to break up under examination. I find its exact facsimile 

 in Derbyshire. 



7. Mesenchytrcsus setosus, Mich. 



The genus Mesenchytrcsus was founded by fc isen (7) in 1878. 

 The present species is readily distinguished by the enlarged setae 

 which occur in segments 5, 6, 7. It is a curiois fact that one 

 often finds a larger number of setae, or setae of a special type, in 

 this region of the body in close proximity to the spermathecae. 

 The specimen examined was not adult. Length 6-8 mm., seg- 

 ments 45-50. Nephridia with very small anteseptal and large 

 lobed postseptal. Three pairs of septals, and dorsal vessel 

 arising about the sixteenth segment. Michaelsen records it for 

 Hamburg and Calefeld. Southern has found it in Ireland, and 

 my own records included Oberbieber on the Rhine, Cauldwell near 

 Burton-on- Trent, and Solihull, Warwickshire. 



8. Henlea nasuta, Eisen. 



This isone of the best known and most widely distributedEnchy- 

 traeids. My specimens, found in the Schloss Gardens, Neuwied, 

 were as follows : Length, 10-12 mm., segments about 60, some- 

 what short and stumpy. Setae usually 6, about equal in length. 

 Spermathecae consisting of a pear-shaped ampulla with a duct 

 somewhat longer than it. Brain a little longer than broad, not 

 widening materially behind, with a concave anterior and incised 

 posterior. Girdle extending over segments 12 aud half 13. One 

 pair of oesophageal glands, from the posterior of which the dorsal 

 vessel arises. Coelomic corpuscles large, broad, oval to round, 

 and well defined. 



Zool. 4th ser., vol. XX., October, 1916, hh 



