498 FAUNA CANABENSIS. 



Mouth small and rounded, the lips with several folds. In the speci- 

 mens preserved in spirits no ocelli could be made out. Though 



-a. 



Fig. 4. — Nephelis verinifoi'niis, Nich. Enlarged.— a:. Acetabulum. 



certainly new to America, it is possible that this form is only a variety 

 of some other species, but the impossibility of obtaining access to the 

 necessary works of reference renders me unable to speak positively 

 on this j^oint. 



The habits of N'ephelis vermiformis are very different from those 

 of the two species of Clepsine already described. Instead of remain- 

 ing quiescent, attached to some foreign body, it is exceedingly active 

 in its movements, swimming gracefully through the water by means 

 of a serjDentine bending of the body. 



^«6.— Rare in three fathoms, Toronto Bay. 



5. Scemiris Canadensis, Nich. 



A very slender worm, averaging about an inch in length, but 

 sometimes a little longer or shorter. The body tapering and attenu- 

 ated posteriorly ; the width behind the head being about one twenty- 

 fifth of an inch. Intestine raoniliform ; anus terminal, with three 

 lobes. Setse in four fascicles on each segment ; each fascicle of three 

 or four setse ; the setaa forked and hooked at their tips. Colour 

 during life red. 



Owing to some defect in the spirit in which these specimens were 

 originally put up, their state of preservation was so bad as to render 

 it impossible to make out many important points in their organi- 

 sation. I have, however, no doubt as to the specific distinctness of 

 this form. It is most nearly allied to the Scenuris limicola of 

 Verrill, obtained in Lake Superior, but it is much lai'ger, and the 

 setse are hooked and bifurcate at their tips, instead of being simply 

 curved and acute. 



Hah. — Extraordinarily abundant at all depths in Lake Ontario, 

 ■wherever the bottom consisted of a fine argillaceous mud. Beyond 



