70 WISCONSIN PHYTOPLANKTON 



always with two apical cilia of equal length ; generally with two lami- 

 nate, parietal, golden-brown chromatophores and without an eyespot. 



The only family represented in the flora of the state is that of the 

 Euhymenomonadaceae. 



Family EUHYMENOMONADACEAE. 



Differing from other families of the order in having a definite sculp- 

 tured periplast and an anterior vacuolar system. Synura the sole 

 representative. 



SYNURA Ehrenberg 1838. 



Cells radially arranged in spherical to oblong-ovoid free-swimming 

 colonies that are not enclosed by a gelatinous sheath. Individual cells 

 broadly pyriform, with the narrower end towards the center of the 

 colony. Outer portion of cells firm, with small spines, reticulations, 

 or combinations of the two. Cells with two long anterior cilia of equal 

 length, several vacuoles, two long laminate parietal chromatophores, 

 and without an eyespot. 



Eeproduction by division of cells and liberation of cell contents to 

 form amoeboid cells. Akinete formation also known. 



SYNURA UVELLA Ehrenberg. PI. 12, Figs. 9-10. 

 Infusionsthierchen 61, pi. 3, figs. P-9\ 1&38. 



Exterior of cells covered with fine spines that are generally limited 

 to the anterior portion. (Facultative Planktont). 



Cells 8-17 /* broad, 20-35 p, broad. Colonies up to 350 /* in diam. 



Camp (ss), Canteen (cc), Crawling Stone (rrr), Fowler (cc), Jenny (rr), 

 Kawaguesaga (rr), Little Bear (rrr), Little Crooked (rr), Long (3) (r), 

 Lower Nemahbin (rr), Lynx (r), Mendota (ss), Mercer (rr), Mill (ccc), Mud 

 (2) (rr), Nagawicka (cc), Nancy (cc), Nicaboyne (rr), No Mans (cc), North 

 Turtle (rr), Oconomowoc (s), Palmer (c), Pardee (sss), Pewaukee (sss), 

 Pope (rrr), Rainbow (1) (rr), Red Bass (ss), Round (1) (sss), Rudolph (sss), 

 Sand (4) (rr), Sanford (ss), South Turtle (rr). 



Order OCHKOMONADALES. 



Cells solitary or colonial, free-swimming or sessile, not forming pal- 

 mella or rhizopodial stages. Cells naked, or with a definitely shaped re- 

 ceptacle ; two lateral or apical cilia of unequal length, one or two golden- 

 brown discif orm to laminate chromatophores ; contractile vacuoles ; and 

 an eyespot. 



