Turner—Ecological Notes—Cladocera and Copepoda. 157 
pond. The temperature of the water varied from 4° C. to 
8° C. In those places and under those conditions, the 
species was abundant. This is a very large form. 
On one occasion, in a pond formed by the overflow of 
Butler’s Creek, I found a specimen which had the struc- 
tural peculiarities of C. ingens, but a size but little larger 
than the large forms of C. insectus. The dimensions were 
as follows: length of the first thoracic somite 0.74 mm., 
length of the thorax 1.20 mm., length of the abdomen 0.60, 
length of the abdominal furea 0.18, length of the abdom- 
inal setae 1.18, total length, excluding the setae, 1.80, 
total length, including the setae, 2.98, length of the anten- 
nae 0.78. width of the first abdominal somite 0.22, width 
of the remainder of the abdomen 0.16, length of the ab- 
dominal furea 0.06. 
Gammarus was associated with this variety. 
8. CYCLOPS BICUSPIDATUS Claus. 
Cyclops forbesi, Herrick & Turner, ’95, p. 104. 
Cyclops bicuspidatus, E. B. Forbes, ’97, pp. 44-47; pl. XII., fig. 1-4. 
This form was found in three localities: among plants, 
in a marsh; in the weedy, temporary, portion of a no-out- 
let pond; and in a shallow lagoon with a bare red-clay bot- 
tom. The temperature of the water varied from 12° C. 
to 15° C. 
In addition to the Entomostraca mentioned in the 
table, associated with it were gammarids, hydrachnids, 
and may-fly larvae. 
9. CYCLOPs sIGNATUS Koch, var. coronatus Claus. 
Cyclops signatus, var. coronatus, Herrick & Turner, ’95, p. 106; 
pl. XV., fig. 1-4. 
This variety was found in two localities; in the shallow, — 
grassy, edge of a large pond which was fed and drained 
by a large creek; and in a large hole filled by the over- 
flow from Butler’s Creek. The temperature of the water 
was 8° C. The specimens were conspicuously banded 
- with blue. 
