76 Clarence J. Elmore 



Belvidere, Blackpipe, Little White River, Rosebud. Turtle River, S. 

 Dak. ; Court Lake, fresh water near Devils Lake, N. Dak. ; Cheyenne, 

 Wyo. ; Emporia, Kansas. 



29. Navicula cryptocephala Kiitz. BacilL, p. 95, pi. 3, figs. 20- 



26. 1844. 



PI. 9; figs. 312-318. 



Lanceolate to elliptical, 23-37 /a long, 7-9 /x wide, from slightly 

 or not at all attenuate to rostrate-capitate ; striations radiate in the 

 center and converging at the ends, 12-18 in 10 /x. Includes A''. 

 cryptocephala var. vcneta (Kiitz.) Rabenh. 



Very common in creeks, tanks, springs, also fossil : Andrews, Anselmo, 

 Arbor, Ashland, Auburn, Aspinwall, Bellevue, Benkleman, Big Alkali Lake, 

 Brock, Brownlee, Burge, Central City, Clear Lake, Columbus, Crawford, 

 Culbertson, Dawson, Dismal River, Dunning, Durly Lake, Emerald, Em- 

 mett, Fairbury, Falls City, Fremont. Grand Island, Hackberry Lake, 

 Flaigler, Hemingford, Humboldt, Hyannis, Julian, Lakeside, Lincoln, 

 Little Alkali Lake, Lodi, Long Lake, Long Pine, Louisville, Mason City, 

 New Helena. Newport, Norfolk, North Platte, Omaha. O'Neill, Orella, 

 Orleans. Pawnee City, Peru, Phalaris Lake, Pleasant Dale, Red Cloud. 

 Rulo, Rupert, St. Michael, St. Paul. Scottsbluff, Seneca, Seward, Stanton. 

 Stromsburg, Talmage, Tecumseh, Tekamah, Thedford, Trenton, Valen- 

 tine. Wahoo, Wann, Weeping Water, West Point. Whitman, Woodlake. 



Fossil: Cherry County, Hay Springs, Merriman. Thedford. 



Belvidere, Blackpipe, Conata, Imlay, Kadoka, Little White River, Red- 

 leaf, Weta, Rosebud, S. Dak. ; Court Lake, Devils Lake, fresh water near 

 Devils Lake, N. Dak. ; Cheyenne, Wyo. ; Stockton. Cal. ; Ft. Collins, Colo. ; 

 New Concord, Ohio. 



30. Navicula rhynchocephala Kiitz. BacilL, pi. 50, fig. 55. 1844. 

 Xavicula rhynchocephala (Kiitz.) W. Sm. Brit. Diat., I. p. 47. 



1853. 



PI. 9, figs. 320-324. 



From broadly lanceolate to linear-elliptical, 23-60 /x, long, 7-10 /x 

 wide, varying from attenuate to rostrate-capitate; striations 9-15 

 in 10 /x, more distant in the center than at the ends, radiate through- 

 out nearly the length of the valve, converging at the ends. In- 

 cludes N . rliynchocephala var. rostellata. 



In springs and creeks with Sfirogyra and other algae: Fairbury, Orella. 

 Turtle River, S. Dak. 



