108 BULLETIN UNIVERSITY OF MONTANA 



secure specimens in day time the hose must go to a depth of 25 or 30 

 feet, while at night they were as numerous at the surface as any place 

 else. These diurnal movements are very interesting. It does not ap- 

 pear that the movements are in schools, but that the movements are 

 everywhere uniform. 



These observations are not in accord with those made on Flathead 

 lake on July 6. At that time Cyclops pulchellus Koch was exce^ingly 

 abundant on the surface of Flathead lake, in great numbers, on a bright 

 sunshiny day. 



Observations showed that life at night was most abundant at the sur- 

 face, the quantity decreasing toward the bottom, until at the lowest point 

 reached by the appartus, 140 feet, but few forms and relatively few of 

 each species, were found. Life in the lake is scanty as compared with 

 that in the shallow ponds near the lake, and small ponds found at other 

 places. Yet considering that the water is so clear and cold and con- 

 tains so little food the life appears abundant. 



The most abundant species, which had practically entire control of 

 the lake was what appears to be a new species of Diaptomus. The next 

 was Daphnia thorata Forbes, a species allied to Daphnia hyalina Leydig. 

 Cyclops Americana Marsh was rather abundant. No amphipod crusta- 

 sea were observed in any place. 



The work in this lake was made possible only by the use of a canvas 

 boat which was secured on purpose for the work, and which served its 

 purpose admirably. See Plate XXVIII. This boat was 14 feet long, and 

 carried about 800 pounds as the largest load given it, carrying this in 

 perfect safety. The only boat on the lake was an Indian scow found near 

 the upper end on the shore, which the boys towed to camp and fixed up 

 so as to be serviceable, but which was very unwieldy and could not be used 

 to any advantage. It was jocularly termed the Oregon, but was not used 

 to any extent, and would never have been found save with the canvas boat. 

 The canvas boat, Daphnia, was used constantly to transport the collector?, 

 to different parts of the field at the lake, and to go across and from end 

 to end. It was in use most of the time by some one, was light and easy 

 to handle, and was a general favorite. The boat was a source of much 

 examination on the part of the Indian visitors both here and at other 

 portions of the reservation. They seemed to think it was good for any 

 kind of a trip, and an invitation was extended later to take a badly wound 

 ed Indian with a well friend a distance of 20 miles on Flathead lake, and 

 the same distance returning. Needless to say the offer was not accepted. 

 It was with much hesitancy a canvas boat was taken, fearing it would 

 be unserviceable, but it was a complete success. In a short time after 

 landing at the lake the boat was in use and was readily packed up when 

 camp was broken. 



By following the canyon leading south toward the Jocko for a dis- 

 tance of two miles there are to be found several ponds. The first 

 one is small, and at the time of our observations contained little water, 

 though much life in proportion. In fact the first pond was not much 

 more than a puddle. This was in the canyon before it had widened much. 

 But a little farther the canyon widens considerably, making a pond cover- 



