1907.] NATURAL SCIENCES OF PHILADKLI'IIIA. 451 



Sexually mature specimens bear, on all parapodia after \'lll, a tuft 

 of extremely delicate capillary seta as Ions ^"5 the width of the body 

 plus one parapodium. These do not arise from a special notopodial 

 tubercle, but from a notopodial setigerous area at the base of the dorsal 

 and posterior face of the neuropodium, and are not even supported by 

 a notopodial aciculum. 



AVlien retracted the proboscis occupies the first 3 segments and the 

 gizzard the next 5. Wlien extended the proboscis (fig. 1, a) is cylin- 

 drical or urn-shaped, reaching to or beyond the end of the cephalic 

 tentacles; the chitinous lining thick, brownish, with a smooth reflected 

 rim and no tooth. Just behind the rim is a circle of 10 rather promi- 

 nent, rounded, soft papillae. When the proboscis is protruded the very 

 large gizzard is drawn forward into somites II to VI inclusive. 



Body generally colorless when alive, the intestine grayish drab and 

 the eyes bright red. 



As noted above the sexual forms are simple epitokes, with swimn\iug 

 sette and gonads beginning at somite IX behind the stomach. 



Taken rather rarely at the surface at Woods Hole. Type No. 2402, 

 Academy of Natural Sciences of Philadelphia. This is the species 

 referred to by Verrill as having been taken at Woods Hole along with 

 ,S. setosa {Rep. U. S. Fish Comm. for 1882, 1884, p. 664, footnote), 

 and is perhaps the S. longicirrata Oersted, of Webster and Bendict, 

 taken by them at Eastport, Me., but is not that species as described 

 by European authors. From typical species of the genus it differs in 

 the small size and ventral position of the palps. In this respect it 

 stands nearest to S. setosa, with which it should probably stand in a 

 separate subgenus. 



