SHIRAS EXPEDITIONS TO WIIITEFISH POINT. 133 



bottom, leaving little trails behind them. A few ])ike.s were noted in 

 and about this bay. 



A few dragon fly larvae {Somaiochlora sp.) and many small Sphacri- 

 ums (Sphaeriwn rhomhoideum) and a few snails (Physa heterostropha, 

 and PIano)-bis antrosus striatus) were the aquatic invertebrates found at 

 this station in making fish collections. Some tadpoles and a turtle 

 were noted. A solitary sandpiper w^as flushed, and a kingfisher re^ 

 mained about the station, and now and then its splash could l^e heard 

 as it struck the Avater, or it could be seen to dash from a dead tamarack 

 to the place where fish were schooling. Recently used channels and 

 other evidences made it appear that beavers were frequenting this bay 

 at the time the field work was being done. These animals certainly 

 constitute a dynamic feature in the aquatic life of this bay. 



Another bay (Station 52) with similar conditions to that of Station 

 55 is a short cfistance east of Station 55 and connected with the bay 

 called Station 53 (Plate XXA). It is oval in surface form and some 

 fifty by eighty feet in diameter, A deposit of muck some six or seven 

 feet thick exists here. In all probability the bay w^as dug out by 

 beavers. Hundreds of fish were seen here on every visit. They were 

 similar in relative numbers and manner of association to those of 

 Station 55. The following were collected: red-bellied minnow, 

 Cayuga minnow, black-head minnow, silvery minnow, Leuciscus 

 neogaeiis, Iowa darter, brook stickleback, and common sucker. 



Shrub-bordered Shoal. In a number of places small shrubs (Myrica 

 Gale) form fringes about the edges of these lakes. Fish find seclusion 

 near and among the submerged bases of these plants. Station 59 

 (Plate XXB) and Station 71 (Plate XXII A) are the examples of this 

 type studied. Pikes w^ere frequently seen here, apparently in ambush. 

 Red-bellied dace, Cayuga minnows, black-head minnows, and brook' 

 sticklebacks were also often found and schools of large common suckers 

 stayed about the gale fringe of Station 59. Many of the suckers Avere 

 a foot or a little more in length, and dozens of them were seen at every 

 visit to the place, although none were noted elsewhere in the marsh 

 lakes except for a few at Station 55. This may have been due to the 

 unusually deep water, about three feet, along this shore. 



Sponges were abundant on submerged gale ]>ranches. Those col- 

 lected were Spongilla lacustris. Ami)hii)ods {Hyaklla knickerhockeri), 

 dragon-fly larvae {Tetragoneura sp.) and dipterous larvae {Chironomus 

 sp. and Ceratopogon sp.) were also noted. 



Water Lily Association in Shallow Water. A place of this kind is 

 Station IIG (Plate XXIVA). A large school of small perch, about an 

 inch and a half long, and also many little minnows, an inch or less in 

 length, were found in this habitat. 



