1899] Odell— Freshwater Polvzoa. hi 



case in the sunlight instead of in the shade, attached to sub- 

 merged or floating weeds. The statoflasts of Fredericella are 

 distinguished from those of all others in having no annulus. In 

 shape they are veinform, and are destitute of spines. 



Locality and habitat. Very common in the Rideau River 

 above Hog's Back in a small bay west side of the locks, attached 

 to stems of Myriophyllum spicatuni ; also in Patterson's Creek 

 near Elgin street bridge on HetcrantJicra. Also obtained during 

 the winter on stems of Anacharis Canadensis from clay pits in 

 Odell's Brick Works, Ottawa East, July, 1898. 



Paludicella Ehrenbergii, Van Beneden. 



" These colonies may always be distinguished from all 

 other tube-making Polyzoa by their jointed appearance, each 

 cell being club-shaped. The colonies are irregularly branched 

 and are built up of a single rov/ of cells placed end to end, the 

 narrow end or handle of the club being attached to the broad 

 end of the cell immediately behind it. The opening through 

 which the polypide protrudes its circular lophophore is at one 

 side of the broad end of each cell and near the top."* No 

 statoblasts of Paludicella have been discovered; reproduction 

 is effected by budding. Unlike other genera of Fresh-water 

 Polyzoa, it has Hibernacula or winter quarters for the resting 

 buds, which correspond with the statoblasts of other genera. 

 " At the approach of spring the bud becomes covered with a 

 horny sheath, thus preserving it till the following spring." The 

 bud then splits vertically after which the young is developed in 

 the usual vvay."-|- The tentacles of this genus are sixteen. 



Locality and habitat. This is by far the rarest form of 

 Fresh Water Polyzoa found at Ottawa. Three colonies were 

 obtained on stones only. In the little rapids above Billings' 

 Bridge, Rideau River ; also at Hurdmans Bridge, same stream ; 

 and in the shallow above the rapids at the Canadian Pacific 

 Ry., bridge, Rideau River, Aug. 1898. 



*Dr. A. C. Stockes " Aquatic Microscopy " p. 249. 

 t" Ponds and Rock Pools" p- 132. Scherren Hy. 



