Diaptomus Pseudosanguineus Sp. Nov. 9 



17. DAPHNIA LONGISPINA var. HYALINA Leydic. 18«0. 



Daphnia hyalina, Herrick * Turner. 'SS. pp. 195. 19«. pL IS. fig. 



7. 8 ; pi. 27. fig. 6 ; pi. 35, fi«. IS : pi. 49. flc. S-5 : pL it. flc. 1-4. 



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



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



the females were carrying winter egga. 



18. DAPHNIA LONGISPINA var. LONGIREMIS Sara IStl. 



Daphnia longiremit, Herrick it. Turner. '9S. p. SOX. 

 Found in April, 1909. in great numbers in an ox-bow lake with a tena- 

 perature of IS'C. Collected in May, 1920. from a small temporary pond the 

 temperature of which was 18 *C. 



19. DAPHNIA PULEX (de Geer) 1778. 



Daphnia pulex, Herrick ft Turner. '95. pp. 19S. 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 temi)erature ranging from 19-I5*C. and in water having a hydrogen Ion 

 content varying from PH 7.2 to 7.C. Winter egga found in June and July. 

 JO. DAPHNIA RETROCURVA Forbes 1812. 



Daphnia kalbergeneait, Herrick ft Turner. 'IS. pp. SOt. 204. pL tl, 

 tig. 1-2: pi. 63, flg. 5-8. 

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

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

 calling it var. brevicep* Blrge. The temperature of the water raried from 

 24-31<'C. and the hydrogen ion content of the water was PH S.O. 

 GEKU8 MOINA BAIRD 1150 



21. MOINA BRACHIATA (Jurine) 1820. 



Moina brachiata, Herrick ft Turner. 'M. pp. IM. Itt. pL If. tff. 

 £-8 : pi. 43. flg. 1, 2. 

 At times during the summer this ■p«el«s la 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 t>ears conunensal Vortlcellldae. 



22. MOINA RECTIROSTRIS (Leydig) 1860. 



Moina rvctiroatris. Herrick ft Turner, '$1. pp. 111. 114. pL 19. tg 

 1-4; pi. 41, flg. 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'S5*C.. the hydrogen Ion 

 content from PH 7.0 to PH 7.6. 



GENUS SCAPHOLEBERIS SCHOEDLBR 1851 

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



Scalpholeberit mucronata, Birge '78. pp. €-9. pi. 2. flg. I. •. 

 Scapholeberis mucronata, Herrick ft Turner. '95. pp. 174. ITS. pi. 

 48, flg. 4-7 ; pi. 45, flg. 6. 

 Abundant in weedy marshes and eertaJn ponds in this neighborhood. 

 Collected in water ranging in temperature from 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 SIMOCEPHAL.US (O. F. MUELLER) 1776 

 24. SIMOCEPHALUS SERRULATUS (Koch) 1841. 



Simocephalua americanua, Birge, '78. pp. 6-8. pi. 1. flg. 6. 

 Simocephalua aerrulatua, Herrick ft Turner, '95. pp. 179. 

 Simocephalua americanua, Herrick ft 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. 



