ON THE NEPHRIDIA OF THE POLYCHiETA. 455 



EXPLANATION OF PLATES 32—35, 



Illustrating Mr. Edwin S. Goodrich's paper '^On the 

 Nephridia of the Polychseta." 



List of Reference Letters. 



ap. t. Aperture for the tube of the solenocyte. b. White amoeboid cor- 

 puscle, e. White granular corpuscle, eh. Fragment of chseta. cil. org. 

 Ciliated organ, deg. nuclei. Degenerating nuclei, ejccr. gr. Excretory 

 granules, fl. Pointed flap of the ciliated organ, qr. c. Granular cell. haem. 

 Haemoglobinous coelomic cell. itii. Intestine, n. Nucleus. 7ieph. Ne- 

 phridium. r. Ridge. A i. c. Tube-bearing cell or solenocyte, 



PLATE 32. 



Fig. 1. — Inner view of a portion of Glycera siphonostoma opened 

 along the mid-dorsal line and stretched out. The gut, part of the longitudinal 

 dorsal muscles on one side, and one bundle of chsetse, have been removed to 

 expose the nephridia. 



Fig. 2. — View of the " nephridial complex " in two segments of a similarly 

 dissected Gl. unicornis. 



Fig. 3. — Nephridial complex of Gl. siphonostoma dissected out. The 

 outer lip of the ciliated organ is torn off short. The contents of the ne- 

 phridial sac are seen by transparency. Fresh. Cam. X 100. 



Fig. 4. — Edge of the nephridium of a Gl. siphonostoma, showing the 

 tube-bearing cells, or solcnocytes, with small processes. Fresb. 



Fig. 5. — Three solenocytes broken off free, from a teased nephridium of Gl. 

 convolutus. Fresh. Cam. I. Oil im., oc. 3. 



Fig. 6. — Corpuscles in the ccelomic fluid of Gl. unicornis. Fresh. Cam. 

 X 400. 



Fig. 7, — Optical section of the edge of the nephridial sac, and overlying 

 nephridium. The "excretory mass" is composed of amcEboid cells, degene- 

 rating coelomic cells, and refuse; from a posterior nephridium of Gl. uni- 

 cornis. Fresh. Cam. X 400. 



Fig. 8. — Transverse section of Gl. unicornis. Cam. Z. aa, oc. 3. 



Fig. 9. — A pair of solenocytes of Gl. unicornis. The flagella are seen by 

 transparency in the tube and underlying chamber. Fresh. 



Fig. 10. — Another variety of the same cells. Fresh. Cam. I. Oil im., oc. 3. 



