worm" life. Tho v/ater contains a hi£;h percentap;e of salt, 

 and the warm season is lone, and these factors may accoiint 

 wholly or in part for the absence of T. navalis. 



Of tho thousands of yoimg specimens (under four 

 inches in length) I l:ave taken from boxes, all were of 

 X. fimbriata except four specimens of T. navalis. These 

 were observed in June, July and early in August. Whether 

 tlie absence of T. norvep:ica was due to unfavorable loca- 

 tions, or the season for attachment is different from that 

 of the other two species, I was not able to determine. 



Breeding Habits. As is well known, some species of Tere- 

 do retain their eggs in the gills during the embryonic 

 development. This is true of T. navalis, and even the 

 small, (an inch or more ) specimens of this species I have 

 taken, have usually had embryos in various stages of devel- 

 opment. On the other hand, I have found that the eggs of 

 the other two species are laid free into the water. If 

 species of T.rorvegica be taken from their tubes, they 

 soon begin to extrude their sexual p^'oduct;:, if th'^se be ma- 

 ture. The eggs and sperm are exti'uded from the anal or 

 exhalent siphon in a slow, steady stream, vMiich continues 



