EXPLANATION OF PLATE XXV. 



Fig. 5. — Chaetae sleeve, showing the absence of any special distribution 

 about it. The glandular openings appear as black dots in 

 regular rows. 



Fig. 6.— Area about the nephropore. 



Fig. 7. — The posterior portion of the prostomiuni, showing the size of 

 the organs in that part. 



These micro photographs were taken with a Zeiss microscope, AA objec- 

 tive, and the No. 12 compensating ocular. The magnification in each case 

 is about ss diameters. 



