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 exceedingly 
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 collectors 
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- 
