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 furca 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 furca 0.06. 



Gammarus was associated with this variety. 



8. CYCLOPS BICUSPIDATUS ClaUS. 



Cyclops foroesi, Herrick & Turner, '95, p. 104. 



Cyclops bicuspidatus, E. B. Forbes, '97, pp. 44-47; pi. 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° 0. 

 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; 

 pi. 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. 



