Se mi-Centennial Volume. 165 



93. C. glomvmta Kuetz. Plate IV, fig. 29. 

 Kansas: Mound City, August, 1915. 

 Missouri (9); Colorado (15); Nebraska (24-25); 

 Iowa (4). 



9Jt. C. Uberrima Lambert. 



Kansas: Burlingame, November, 1915, October, 1916. 



95. C. calliconio Kuetzing. 

 Kansas: Horton, June, 1916. 



96. C. sp.? 



Kansas: Council Gi-ove, November, 1915. 



97. C sp.? 



Kansas: Medicine Lodge, August, 1915. 



CLASS V. 



BACILLARIE.-E or Diatoms include a very large number of unicellular 

 plants. They have beautifully marked siliceous cell-walls, the marks 

 being constant in size and arrangement for each species; cell constructed 

 in two parts (valves) one overlapping the other in the manner of a pill 

 box; a longitudinal cleft (raphe) which runs from end to end is a series 

 of openings through which pseudopodia are thrust for locomotion. The 

 cells contain a central nucleus swung in cytoplasm and two or more 

 brown-greenish-yellow chromoplasts. "In cell division the growth of the 

 protoplast separates the valves and division occurring in the plane of the 

 valves, each new protoplast possesses one of the old valves and forms 

 a new valve on the naked side." (8a ) It has been estimated that 

 there are over ten thousand species of Diatoms. 



Key to the Subfamilies of Bacillariese. 



I. Valves with a concentric or radiating structure around a central 

 point; without raphe; valve view circular or broadly elliptical. 



Centricae. 



II. Valves never concentric, mostly broad-shaped, with a raphe. 



Pennatse. 

 Subfamily I. Centrice^e. 



The Discoideae is the only tribe of the Centricae which has representa- 

 tives in our Kansas reservoirs, Melosira being the genus identified. 

 Melosira is characterized by frustules with circular, very wide connective 

 bands, attached valve to valve forming long cylindrical filaments. 



98. Melosira Agardh. Plate IV, fig. 31. 



Kansas: Burlington, April, 1916; Emporia, April, 



1916; Horton, June, 1916. 

 Nebraska (25-2); Iowa (4). 



Subfamily II. PENNATiE. 



Key to the Tribes of Pennatse. 



I. Cells mostly straight, rod shaped or lanceolate, without a raphe but 

 sometimes with pseudoraphe Fragilarioidese. 



II. Cells crooked or suddenly bent, with a raphe on one valve and a 

 pseudoraphe on the other Achnanthoideae. 



III. Cells with a raphe on each valve Naviculoideie. 



IV. Cells with the raphe concealed in submarginal wings of each valve. 



Surirelloidese. 



