Plate I. 

 Fig. 1. Photograph of tubes of Clia'toptcrus in sitn on shoal at low tide. 

 Rednced V5. 



Fig. 2. Photograph of parchment-like tube with lateral extension and 

 intermediate tube. Removed from the sand. Natural size. 



Fig. 3. Photograph of 5 Cha'topteriis removed from its tube. Dorsal aspect. 

 Shows general transparency of the integument, the forward tilting of the 

 accessory feeding-organ of the thirteenth segment, the presence within the 

 parapodia of the sexual segments the coiled ovaries. Reduced %. 



Fig. 4. Photograph of (^ Chcetopterus removed from its tube. Dorsal 

 aspect. Shows the forward tilting of the accesory feeding-organ of the 

 thirteenth segment and the milky-white color which is due to the presence 

 of ripe spermatozoa within the parapodia of the sexu,al segments. Re- 

 duced %. 



