Ig4 Trans. Acad. Sci. of St. Louis. 



caudo-ventral angle; on the caudal margin, near the caudo-ventral 

 angle, are several small bristles; the claws are slightly flexible and 

 bear neither spines nor teeth; but, on their caudal margins, there are 

 several bristles. 



Habitat : Augusta, Ga. ; shallow marsh with a grassy 

 bottom and a water temperature of 12° C. ; collected Jan- 

 uary 23, 1908. Besides the Entomostraca mentioned in 

 the table, associated with it were gammarids, Asselidae, 

 hydrachnids, etc., but no filamentous algae. The grass 

 was dead. 



acantholeberis Lilljeborg. 



28. ACANTHOLEBERIS CURVIROSTRIS 0. F. M. 



Acantholeberis eurvirostris, Herrick & Turner, '95, p. 218; pi. 

 XLVL, fig. 1-4. 



This rare form was found, on only one occasion, in a 

 hole fed by the overflow from Butler's Creek. The tem- 

 perature of the water was 8° C. To the best of my know- 

 ledge, this is the first time that this form has been found 

 in America. 



ILYOCRYPTUS. 



29. ilyocryptus spinifer Herrick. 



Ilyocryptus longiremus, Birge, '91, pp. 392-393; pi. XIII., fig. 18. 

 Ilyocryptus spinifer, Herrick & Turner, '95, pp. 221-223; pi. LV., 

 fig. 1-4; pi. LVL, fig. 18, 19, 21. 



Near Augusta, this species is rare. The water in 

 which it was found had a temperature of 6° C. 



eurycerus Baird. 



30. eurycerus lamellatus 0. F. M. 



PI. XXXVIII. /. 2. 



Eurycercus lamellatus, Herrick & Turner, '95, p. 226; pi. XL VI., 

 fig. 7, 8; pi. LI., fig. 6; pi. LX., fig. 5, 6; pi. LXIL, fig. 19. 



In Butler's Creek and in the ponds fed and drained 

 by it, this species is abundant, when the water tempera- 

 ture ranges from 4° C. to 8° C. 



In addition to the Entomostraca mentioned in the table, 

 associated with it were gammarids, may-fly larvae, diving- 

 beetles, and hydrachnids. 



