198 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



stones, which are the favorite resort, long after the colony has disappeared. The 

 free statoblasts are nearly circular. Statoblasts and brown bodies very abundant 

 in mature colonies. 



This species is the most abundant and widespread of the Bryozoa of Geor- 

 gian Bay, being found all around the bay along exposed shores. 



The habitat is chiefly under flat stones along rather exposed shores and in 

 rapid streams, but sometimes in more protected places, and then it may rise from 

 the substratum, the tubes become more rounded and intertwining, and the longi- 

 tudinal clear band often be absent. From the end of May till September. The 

 form is rather constant throughout the season. 



Plumatella punctata Hancock. 



Var., prostrata. Stock repent and open, forming long hyaline tubes that give 

 rise to only a few, likewise repent, lateral tubes. This was found at Go Home, 

 Skerryvore, French River and Killarney. Outside of Georgian Bay it has been 

 found in several places, Brantford, Aurora, and Sudbury. 



The habitat is under stones or sticks in running water, or along more or less 

 exposed shores. At the chute in the Go Home River it occurs associated, or even 

 intertwined with Paludicella articulata and Fredericella sultana. Brown bodies 

 and statoblasts are not abundant. The colonies vary but little with the season. 

 Common in both 1911 and 1912. 



Pectinatella magnifica Leidy. 



The colonies are conspicuously marked with white bodies, situated at the outer 

 ends of the mouth cones and near the ends of the lophophores. The latter i8 

 due to the habit of the animals of flexing the lophophores so that they touch the 

 white body on the mouth cone. Part of the substance adheres to them. 



This species was found at Go Home Bay and French River. It was not 

 abundant. 



The habitat is chiefly under sticks, stones, logs, etc., sometimes under water-lily 

 leaves. It mostly lives in sheltered bays, ponds, or slow streams. July to Sep- 

 tember. More abundant and widespread in 1912 than in 1911. 



Cristatella mucedo Cuvier. 



This species found above the chute Go Home River and sparingly 

 at Tobermory. 



Its habitat is on or under logs, sticks, or sometimes water plants in slow-flowing 

 water. It does not always avoid the light. The statoblasts are abundant. The 

 colonies do not change greatly with the season, but may disappear very quickly. 

 Abundant for a short time in 1911 and 1912. 



