748 EDWIN S. GOODRICH. 



PLATE 42. 



Fig. 40. — Portion of a longitudinal vertical section through a median 

 segment of Euphrosyne foliosa, showing the nephridium, partly indicated 

 by dotted lines. Cam. D, oc. 2. 



EiG. 41. — Enlarged view of the nephrostome of Praxithea (Nereis) 

 irrorata. From the living. 



Fig. 42. — Enlarged view of the nephrostome of Nereis longissima. 

 From the living. 



Fig. 43. — Some of the ciliated processes of the same nephrostome. 

 Fig. 44. — Enlarged view of the nephrostome of Lipephile (Nereis) 

 cultrifera. From the living. 



Fig. 45. — Some of the ciliated lobes of tiie same nephrostome, with the 

 nuclei stained. 



Fig. 46. — Enlarged view of the anterior portion of the nephridium of a 

 female Polygordius neapolitanus, in optical section. 



Fig. 47. — Portion of transverse section of an immature Polygordius 

 neapolitanus, showing the nephridium. Cam. D, oc. 3. 



Fig. 48. — Semidiagrammatic reconstruction of the extremity of one of the 

 branches of the "head-kidney" of a larval Polygordius sp., showing the 

 solenocytes. The exact relative position of the tubes and the web is still 

 uncertain (see page 716). 



Fig. 49. — Enlarged view of the nephrostome of a larval A.renicola (page 729). 



Fig. 50. — Reconstruction of the fused genital funnel and nephridial duct in 

 a mature Irma latifrons, seen from in front. 



Fig. 51. — Reconstruction of the fused genital funnel and nephridium of a 

 mature Alciope cantraiuii, seen from the side. 



