128 Clarence J. Elmore 



fresh water near Devils Lake, N. Dak. ; Cheyenne, Wyo. ; Stockton, Cal. ; 

 Ft. Collins, Colo. ; Muskingum River, Rio Grande, Ohio. 



4. Cystopleura ventricosa (Kiitz.) Elmore. 



Epithemia ventricosa Kiitz. Bacill., p. J5, pi. ^0, fig. p. 1844. 



PI. 17, figs. 655-657. 



Elliptical, 37-75 iu- long, 19-22 jx wide in girdle view, gibbous in 

 the mi'ddle; ventral side straight or nearly so with ends more or 

 less produced toward the ventral side ; costae heavy, nearly parallel 

 in the center, becoming more radiate toward the ends, 5.5-7 ^^ 

 10 /x; striations granular, 12-14 in 10 /x. Often described as a 

 variety of C. gihba, from which it differs mainly in size and in the 

 larger inflation in the middle. 



Very common in almost all places where any diatoms can grow, also 

 fossil : Ainsworth, Anselmo, Arago, Ashland, Bellevue, Broken Bow, 

 Brownlee, Burge, Callaway, Cedar Creek, Cherry County, Clear Lake, 

 Crawford, Dismal River, Dunning, Emerald, Ewing, Fremont, George- 

 town, Gordon Creek, Grand Island, Halsey, Holt County, Humboldt, 

 Llyannis, Lakeside, Lodi, Long Fine, Louisville, Meadow, New Helena, 

 Norfolk, Peru, Plattsmouth, Pleasant Dale, Red Cloud, Ruby, Rulo, St. 

 Paul, Scottsbluff, Seneca, Snake River, South Bend, Tecumseh, Tekamah, 

 Thedford, Valentine, Wann, West Point, Whitman, Woodlake. 



Fossil: Cherry County, Mullen, Thedford. 



Dallas, Rosebud, Turtle River, Weta, S. Dak.; Devils Lake, N. Dak.; 

 Cheyenne, Wyo. 



5. Cystopleura ocellata (Ehr.) Kuntze. Rev. Gen. Plant., II, 



p. 8gi. iSgi. 



Eunotia ocellata Ehr. Ber., p. 75. 1840. 



Epithemia ocellata Kiitz. Bacill., p. 34, pi. 2p, fig. fi/. T844. 



PI. 17, figs. 658-660. 



Valves lunate, 25-32 /a long, 5-6 ^n wide; ends bluntly rounded 

 or sometimes acute; costae heavy, 3-4 in 10 /x, capitate in girdle 

 view; striations granular, 12-20 in 10 /x,. 



In creeks, lakes, rivers, etc., also fossil : Anselmo, Benkleman, Brown- 

 lee, Burge, Crawford, Culbertson, Dismal River, Dunning, Emmett, Grand 

 Island, Hackberry Lake, Haigler, Halsey, Lakeside, Long Pine, New 

 Helena, North Platte, Red Cloud, Rupert, St. Michael, St. Paul, Scotts- 

 bluff, Seneca, Snake River, Stanton, Tioga, Valentine. 



Fossil : Agate, Loup City, Mullen, Thedford. 



