554 Wisconsin Academy of Sciences , Arts , and Letters. 
fig. 2. Arthrodesmus serratus Corda, in Almanach de Carls¬ 
bad, 9 (1835) p. 244, t. 6, fig. 35. 
Along shore; Devil’s, Kegonsa and Muskallonge Lakes. 
Scenedesmus hystrix LAGERHEIM, in Ofvers. Kgl. 
Vet.-Ak. Forh. 39, No. 2 (1882) p. 62, t. 2, fig. 18. 
Along shore; Minocqua and Muskallonge Lakes. 
Scenedesmus quadricauda (TURPIN) DE BRE- 
BISSON, in Mem. de la Soc. Ac. de Falaise, (1835) p. 66. 
Achnanthes quadricauda Turpin, in Mem. du Mus. d’Hist. 
Nat. Paris, 16 (1828) p. 311, t. 13, fig. 6. 
Plankton; Clear, Green, Lost, Meta, Muskallonge, Ne- 
mahbin (Lower), Okauchee, Old Taylor’s, Pope and Win¬ 
nebago Lakes. 
var. longisina (CHODAT) SMITH, in Trans. Wis. 
Acad. ined. Scenedmus longispina Chodat, in Mater, pour 
la flore cryptogamique Suisse, 4 Fasc. 2 (1913) p. 60, figs. 
53-58. 
Plankton; Lost and Mendota Lakes. 
var. quadrispina (CHODAT) SMITH, in Trans. Wis. 
Acad. ined. Scenedmus quadrispina Chodat, in Mater, pour 
la flore cryptogamique Suisse, 4 Fasc. 2 (1913) p. 58, figs. 
45-52. 
Along shore; Laura and Muskallonge Lakes, 
var. Westii SMITH, in Trans. Wis. Acad. ined. 
Plankton; Meta Lake. Along shore; Adelaide Lake, 
var. maximum W. Sc G. S. WEST, in Trans. Linn. Soc. 
Bot. 2 Ser. 5 (1895) pt. 2, p. 83, t. 5, figs. 9-10. 
Along shore; Old Taylor’s, Rozen and Sunday Lakes. 
Scenedesmus armatus (CHODAT) SMITH, in Trans. 
Wis. Acad. ined. Scenedesmus hystrix var. armatus Chodat, 
in Mater, pour, la flore cryptogamique Suisse, 1, fasc. 3 
(1902) p. 215, fig. 140. 
Plankton; Lake Mendota. Along shore; Clear and Wau- 
besa Lakes. 
Scenedesmus longus MEYEN, in Nova Acta Phys.- 
Med. Ac. Caes. Leop.-Carol. 14 (1829) p. 774, t. 43, fig. 28. 
Plankton; Rock Lake. Along shore; Lake Waubesa. 
Scenedesmus abundans (KIRCHNER) CHODAT, in 
Mater, pour la flore cryptogamique Suisse, 4 Fasc. 2 (1913) 
p. 77. Scenedesmus caudatus forma abundans Kirchner, 
