Diaptomus Pseudosanguineus Sp. Nov. 9 



17. DAPHNIA LONGISPINA var. HYALINA Leydig, 1860. 



Daphnia hyalina, Herrick & Turner, '95. pp. 105, 196. pi. 22, fig. 



7. 8; pi. 27, fig. 6; pi. 35. fig. 16; pi. 49, fig. 3-5; pi. 53, fig. 1-4. 



Found in spring and early summer in certain of the no-outlet ponda in 



this vicinity. Of the form mendolatae. In the latter part of May some of 



the females were carrying winter eggs. 



18. DAPHNIA LONGISPINA var. LONGIREMIS Sars 1861. 



Daphnia longireinis, Herrick & Turner, '95. p. 202. 

 Found In April, 1909, in great numbers in an ox-bow lake with a tem- 

 perature of 15°C. Collected in May, 1920, from a small temporary pond the 

 temperature of which was 18°C. 



19. DAPHNIA PULEX (de Geer) 1778. 



Daphnia pidcx, Herrick & Turner, '95. pp. 193, 194. 

 The most common daphnid of this district. Frequently encountered in 

 summer, even in water so fetid as to have a disagreeable stench. Occurs 

 at temperature ranging from 19-35°C. and in water having a hydrogen ion 

 content varying from PH 7.2 to 7.6. Winter eggs found in June and July. 



20. DAPHNIA RETROCURVA Forbes 1882. 



Daphnia kalbergenesis, Herrick & Turner, '95. pp. 203, 204. pi. 27, 



fig. 1-3 ; pi. 53, fig. 5-8. 



Collected in spring and early summer from one of our lakes. The 



helmet on the head is small and rounded, probably enough so to warrant 



calling it var. hreviceps Birge. The temperature of the water varied from 



24-31 °C. and the hydrogen ion content of the water was PH 8.0. 



GENUS MOINA BAIRD 1850 



21. MOINA BRACHIATA (Jurine) 1820. 



Moina brachiata, Herrick & Turner, '95. pp. 162, 163. pi. 39, fig. 

 5-8 ; pi. 43, fig. 1, 2. 

 At times during the summer this species is abundant in some of the 

 muddy ponds and marshes of this district. Found in water having a hydro- 

 gen ion content of PH 7.6-8.0. It frequently bears commensal Vortlcellidae. 



22. MOINA RECTIROSTRIS (Leydig) 1860. 



Moina rectirostris, Herrick & Turner, '95. pp. 163, 164. pi. 39, fig 

 1-4 ; pi. 41, fig. 2, 5, 8, 10, 11. 

 Found in certain muddy temporary ponds of this district in May and 

 June. The temperature of the water varied from 20-35 'C, the hydrogen ion 

 content from PH 7.0 to PH 7.6. 



GENUS SCAPHOLEBERIS SCHOEDLER 1858 



23. SCAPHOLEBERIS MUCRONATA (O. F. Mueller) 1785. 



Scalpholeberis mucronata, Birge '78. pp. 6-9. pi. 2, fig. 8, 9. 

 Scapholeberis mucronata, Herrick & Turner, '95. pp. 174, 175. pi. 

 43, fig. 4-7 ; pi. 45, fig. 5. 

 Abundant in weedy marshes and certain ponds in this neighborhood. 

 Collected in water ranging in temperature front 27-32°C. and having a hy- 

 drogen ion content between 7.6 and 8.2. The marshes dry up in summer and 

 the ponds are temporary. April, May, June, and October. 



GENUS SIMOCEPHALUS (O. F. MUELLER) 1776 



24. SIMOCEPHALUS SBRRULATUS (Koch) 1841. 



Simocephalus americanus, Birge, '78. pp. 6-8. pi. 1, fig. 6. 

 Simocephahis serrulatiis, Herrick & Turner, '95. pp. 179. 

 Simocephalus americanus, Herrick & Turner, '95. p. 179. pi. 45. 

 fig. 9. 

 In this district frequently found in marshes and among vegetation in 

 ponds and lakes from March to November, in water varying in tempera- 

 ture from 14-32°C. Sometimes so numerous in a certain pond as to be the 

 dominant form and the following year failing to appear in that pond. 



