230 Freda Bage : 



4._Diporochaeta gpandis, Spencer (17), p. 63. 



Nephridio])ores could not be distinguished in the one speci- 

 men avaihible. 



This species is meganephric. 



Macroscopic Structure. — One pair of nieganephridia occur in 

 each segment after the first. These are arranged in the same 

 coils throughout all the segments of the body, but change 

 somewhat in character to^Yards the anterior end. The most 

 noticeable point about the nephridia is a curious single mar- 

 ginal duct [Fig. 11, m.d.]. which passes in a definite way round 

 a portion which is apparently the vesicle ( Y ]). 



Microscopic Structure. — Under the microscope the above 

 duct is seen to be coiled in certain parts, straight in others, and 

 intercellular. It forms a loop surrounding a definite flat layer 

 or layers of connective tissue {Fig. 11, c.t.), and is quite con- 

 spicuous. There is some indication of the presence of a 

 muscular vesicle [Fig. 11, V?]. but as no sections were avail- 

 able, that is doubtful. The funnel is very definite in shape, 

 being surrounded by a Avell-defined row of marginal cells. Just 

 where the cavity of the funnel passes into the intracellular duct 

 there is a curious mass of cells [Fig. ll,m.c.], quite definite in 

 shape, and arranged round the preseptal portion of the intra- 

 cellular duct. This appears to be comparable with the cells 

 occurring in Jjumhricus, figured by Benham (6), p. 297, and 

 regarded by him as coelomic epithelial cells. 



In the specimen of D. grandis examined, enormous numbers 

 of small white spots appeared to be attached to nephridia. On 

 examination these proved to be colonies of sporozoa, though I 

 have not been able to identify them. 



5. — Digastep armifera, Fletcher (6), p. 947. 



No nephridiopores were visible. 



The nephridial system is micronepliric throughout, the anterior 

 nepliridia being modified to form peptonephridia in the first 

 four segments. 



Macroscopic Structure. — On opening the body wall micro- 

 nejihridia are seen to be present tliroughout all the segments. 

 They take the form of small tubes attached to the body wall or 



