yS Clarence J. Elmore 



Fossil : Agate. 



Little White River, S. Dak. 



34. Navicula minnewaukonensis n. sp, 

 PI- 9. figs. 331-332. 



Broadly lanceolate, oblong, or elliptical, 15-20/U, long, 4-6 «. 

 wide ; sometimes slightly constricted below the rounded apices ; 

 striations 15-16 in 10 /x, all radiating except those at the ends, 

 which are perpendicular to the raphe, those in the center slightly 

 shortened, leaving a very small rounded area. 



In sand on shore of Bird Island, Devils Lake, N. Dak. 



35. Navicula lanceolata Kiitz. Bacill., p. P4, pi. 28, fig. 38; pi. 



SO, fig. 48. 1844. 



PI. 9, figs. 333-336; pl. 22, fig. 841. 



Lanceolate or sometimes almost elliptical, 30-50 ^ long, 7-1 1 ix 

 wide, a form at Stockton, Cal., 1^ fi long, 5.5 /x wide; apices more 

 or less rostrate; striations 11-12 in 10 fi, closer at the ends than in 

 the middle, shortened around the central nodule, leaving a round 

 hyaline space, all radiate. One specimen found, fig. 333, is 75 x 

 16 jU, with 9 striations in 10 /a. Sometimes found in the craticulate 

 resting condition as described for A'', cuspidata and A'', amhigua. 

 The cells are occasionally found cohering in bands. Fig. 334 and 

 fig. 335 represent a very small form, 13 /a long. 



Very common in pools, creeks, stagnant ditches, tanks, etc., also fossil : 

 Alma, Andrews, Anselmo, Arago, Ashland, Aspinwall, Auburn, Bellevue, 

 Benkleman, Blue Springs, Broken Bow, Cairo, Callaway, Central City, 

 Cedar Creek, Cody Lake, Crawford, Crete, Culbertson, Dawson, Dewey 

 Lake, Dismal River, Dunning, Emerald, Glen Rock, Gordon Creek, Grand 

 Island, Haigler, Halsey, Hastings, Julian, Lincoln, Long Pine, Louisville, 

 Milford, New Helena, Norfolk, North Platte, Oakdale, O'Neill, Orleans, 

 Paul, Pelican Lake, Peru, Pleasant Dale, Red Cloud, Ruby, Rulo, Rupert, 

 St. Libory, St. Michael, St. Paul, Salem, Scottsblufif, Seneca, Seward, Snake 

 River, South Bend, Stanton, Stromsburg, Talmage, Thedford, Trenton, 

 Valentine, Wann, Watts Lake, Weeping Water, West Point. 



Fossil : Agate, Cherry County, Loup City. 



Court Lake, Devils Lake, N. Dak. ; Blackpipe, Cutmeat, Dallas, Interior, 

 Kadoka, Little White River, Rapid City, Redleaf , Rosebud, S. Dak. ; Chey- 

 enne, Wyo. ; Stockton, Cal. ; Ft. Collins, Colo. ; Blackhand, New Concord, 

 Rodney, Ohio ; Emporia, Kansas, 



