ROTATORIA OF THE OKOBOJI REGION 
273 
d Kettle hole 4 is small, rather shallow, bordered 
section road and on the others by sedges and 
marsh 'grasses. 
5. Kettle hole. Kettle hole 5 is across the road from kettle 
hole 4. It is much larger and deeper. Aquatic plants are found 
growing in it quite abundantly. While it is connected with 4 
by a small culvert, there are some noticeable differences in the 
rotatorian faunae of the two. 
6. Kettle hole. Kettle hole 6 is a small muddy kettle hole in 
the middle of a pasture ; very few species of rotifers were found 
here. 
7. Kettle hole. Kettle hole 7 is rather shallow and muddy, 
and is located in the middle of a stock pasture. Three distinct 
varieties of Brachionus havanaensis were taken from this kettle 
hole, the only place in the district where this form occurred. 
8. Kettle hole. Kettle hole 8 is a small marshy pool near 
Emerson’s bay. Few rotifers were found here. 
9. Creek near Egralharve. This is a small intermittent creek, 
not extensive in its rotatorian fauna. 
10. Marshes near West Okoboji. Under this are grouped 
several marshy kettle holes and sloughs near the railroad station 
of West Okoboji, at the north end of Lake Okoboji. 
11. Gull Point kettle hole. This is a rather large kettle hole 
on Gull Point, connected with the lake by a small channel. No 
very extensive study of it was made. 
12. Green slough. This is a large body of water, connected 
in the early part of the season with Lake Okoboji by a channel 
about four feet wide and one foot deep ; this channel becomes 
closed as the water level falls in the later part of the season. 
The slough is filled with aquatic plants and is bordered by sedges 
and reeds. 
13. Swamps near Center Lake. Here are included several 
marshy bodies of water in the general vicinity of Center lake. 
14. Marsh near Manhattan. This is really a large kettle hole 
with a very marshy, boggy shore. It is almost impossible to get 
near the edge of the kettle-hole proper. Such collections as could 
be made were from shallow puddles of water in the grass near 
the edge. Two species of Mikrocodides were found here. 
15. Gar lakes. The Gar lakes are connected with East Lake 
Okoboji. Very little collecting was done here. 
16. Fish ponds. The ponds of the State Fish Hatchery at 
Orleans, at the head of East Lake Okoboji, furnished many 
