I 



Semi-Centennial Volume. 155 



6. Microcoleus. 



8J. M. Paliidotiun Kuetzing Gomont. 



Apical cell not capitate; sheaths somewhat mucous; 

 trichomes 5-7 mic. in diam., not constricted at the 

 joints. 

 Kansas: Paola, November, 1915, August, 1915. 



Family II. Nostocace^e. 



Key to Genera. 



A. Trichomes flexuous and contorted; within a definite gelatinous 

 investment 1. Nostoc. 



B. Trichomes more or less straight, free or forming a thin mucous 

 stratum; heterocysts and spores intercalary 2. Anabiena. 



1. Nostoc. 



SJ,. N. punctiforme Kuetzing Harlot. 



Plants microscopic, granular, aggregated; filaments 



closely entangled; trichomes scarcely distinct. 

 Kansas: Lyndon, November, 1915; Horton, June, 1916. 



2. Anaba;tia. 



Ke/i to Species. 



I. Gonldia oval or spherical, removed from heterocysts in catenate 

 series; trichomes 4-6 mic. in diam.; heterocysts 6 mic. in diam.; 8 



mic. in length; gonidia 7-9 by 8-14 mic A. variabilis, 



II. Gonidia cylindrical, curved, variously disposed, trichomes 4-8 mic. 

 in diam.; gonidia 7-13 mic. in diam. and 20-50 mic. in length. 



A. fios-aquse. 



35. A. vaHabilis Kuetzing. Plate II. fig. 9. 



Kansas: Horton, August, 1916, great masses along 

 with A. fios-aquse, causing serious trouble by dis- 

 colorations, bad taste and odor of water. 



36. A fios-aqux. Breb. Plate II. fig. 10. 

 Most common form. 



Kansas: Horton, August, 1916; Paola, July, 1916; 



Coffeyville, March, 1916. 

 Colorado (15); Iowa (4); Neb. (24); Mo. (11). 



CLASS n. 



FLAGELLATA is an order of the class Mastigophora of the Pro- 

 tozoa. Cells nucleated with definite external layer of protoplasm pro- 

 vided with one or more vibratile long whip-like flagella; food commonly 

 ingested through the oral aperture; some genera contain chlorophyll 

 and are sustained by nutritional processes resembling those of plants; 

 protoplasm of the cell contains chromatophores, pigment spots, oil glob- 

 ules, etc. 



Key to the Sub-Orders of Flugellata. 



I. Mostly small animals with one large flagellum and frequently one 



or more smaller secondary flagella Monadbm. 



II. Larger animals, commonly with one large flagellum, mouth and 

 commonly pharynx at the base of the flagellum Euglenoidina. 



Sub-Order I. Monadina. 



Colonies, free swimming, yellow to brown; an urn-shaped lorica with 

 an acute posterior end set inside the mouth opening of another individual; 

 2 chromatophores and an eye-spot and 2 unequal flagella. .. .Dinobryon. 

 Dinobrijon 



37. D. setulan'n Ehrbg. Plate II, fig. 11. 

 Kansas: Parsons, August, 1915. 



