WISCONSIN PHYTOPLA.NKTON 69 



MALLOMONAS CAUDATA Iwanoff. PL 12, Fig. 6. 



Bull, de 1'Acad. Imp. d. Sc. de St. Petersbourg 5 Ser., 11: 250, PI, B, flga. 1-8. 

 1899. 



Cells broadly ovoid, with posterior end narrower than the anterior. 

 Scales oval, arranged in transverse series. Setae long, covering the 

 entire surface of the cell and frequently with minute teeth-like projec- 

 tions at the distal end. Cells with two long, parietal, laminate, chro- 

 matophores. ( Euplanktont) . 



Cells 12-30 p. broad, 40-85 ^ long. 



Beasley (rr), Birch (1) (rrr), Browns (rr), Carson (rrr), Catherine (rr), 

 Clare (r), Clear Crooked (rr), Crab (rr), Crawling Stone (rrr), Diamond 

 (rrr), Hill (ss), Jennie (rr), Kitten (sss), Lac la Belle (ss), Long (3) (ss), 

 Long (4) (rr), Lynx (rr), Mud (2) (ss), No Mans (s), North Turtle (r), 

 Okauchee (rr), Otter (sss), Pokegama (1) (rr), Pokegama (2) (r), Red Bass 

 (s), Rock (cc), Round (1) (sss), Rudolph (sss), St. Croix (rrr), Sand (4) 

 (sss), Sanford (sss), South Crab (rr), Wildcat (sss), Wild Goose (rr), Wolf 

 (rr). 



CHRYSOSPHAERELLA Lauterborn 1896. 



Cells ellipsoid to pyriform, in spherical colonies of microscopic size 

 that are partially embedded in a spherical, hyaline, gelatinous envelope 

 containing numerous, tangentially placed, minute plates of silica. An- 

 terior ends of cells with two short, vase-shaped projections, each bear- 

 ing a single, long, straight, siliceous seta of some length. Cells with 

 one anterior flagellum ; two elongate, parietal, golden-brown chromato- 

 phores ; and several vacuoles. 



Reproduction by vegetative cell division. Resting akinetes unknown. 



CHRYSOSPHAERELLA LONGISPINA Lauterborn. PI. 12, Figs. 7-8. 

 Zool. Anz. 19: 16. 1896; Zeits. f. wiss. Zool. 65: 381, pi. 18, figs. 12-16. 1899. 



Specific characters as described above. (Euplanktont). 

 Average breadth of cells 9 p, average length 15 ,u. Colonies 50-250 p. 

 in. diam. 



Bettine (rr), Blue Gill (ss), Boulder (rrr), Canteen (r), Elizabeth (rr), 

 Hill (aa), Lac la Belle (rr), Long (4) (rr), Lynx (r), Marl (rr), Mary (ss). 

 No Mans (rr), Oconomowoc (ss), Okauchee (s), Otter (ss), Rainbow (ss), 

 Round (4) (rr), Rudolph (sss), Silver (2) (ss), South Turtle (ec), Upper 

 Nemahbin (ss), Wild Goose (ccc). 



Order ISOCHRYSIDALES. 



Cells free-floating or sessile, solitary or colonial, naked or with a 

 definite homogeneous or sculptured periplast. Motile phase always 

 present, palmella or rhizopodial phase lacking. Cells variously shaped, 



