The Diatoms of Nebraska 77 



31. Navicula hungarica Grun. in JVicn. Vcrli., p. ^^g, pi. i. fig. 



50. i860. 



Navicula humilis Donk. Brif. Dial., p. 6/, pi. 10, fig. 7. 18/2. 



PI. 9. figs. 325-326. 



Linear-elliptical, inflated in the middle, 15-20^ long, 5-6 /x wide; 

 apices rostrate to rostrate-capitate; striations coarse, about 8 in 

 10^. radiate in the center and converging at the ends, extending 

 almost to the raphe. 



In rivers, creeks, and ponds, also fossil: Andrews, Cody Lake, Craw- 

 ford, Fremont, Gordon Creek, Grand Island, Halsey, Lodi. Long Pine, 

 Louisville, New Helena. Norfolk. Pelican Lake, Pleasant Dale, Ruby, 

 Rupert, St. Paul, Seward. Snake River, Stanton, Stromsburg, Valentine, 

 West Point. 



Fossil : Cherry County. 



Devils Lake, N. Dak. ; Rosebud, S. Dak. ; Ft. Collins, Colo. ; Rio Grande, 

 Ohio. 



32. Navicula digito-radiata (Greg.) Ralfs in Patch. Inf., p. Q04. 



1861. 

 PinnuJaria digito-radiata Greg, in Quart. Jour. Mic. Soc, p. p, 



pl. /, fig. 32. 1856. 

 PI. 9, figs. 327-328. 



Lanceolate or somewhat oblong. 45-80 /i long, 7-12 /a wide, 

 apices more or less obtuse; striations 8-10 in 10 ju,, shortened oppo- 

 site the central nodule, longer striations alternating with shorter, 

 radiate in the middle, perpendicular to the raphe at the ends. 



In rivers : Benkleman, Crawford, Grand Island, Scottsblufif. 

 Belvidere, Blackpipe, Rapid City, S. Dak. ; Blackhand, Muskingum River, 

 New Concord, Ohio. 



33. Navicula reinhardtii Grun. Arct. Diat., p. 32. 1880. 

 PI. 9, figs. 329-330 ; pl- 22, fig. 839. 



Oblong, elliptical, or lanceolate. 35-95 jU, long, 10-20 /x wide, 

 sometimes attenuated toward the obtusely rounded apices ; stri- 

 ations 7-10 in 10 /A, radiate in the middle, becoming perpendicular 

 to the raphe at the ends, shortened, leaving a narrow space along 

 the raphe. 2-4 opposite the central nodule shorter, longer striations 

 alternating with shorter ones, leaving a round central space. 



In creeks, also f os^l : Fairbury. Gordon Creek, Grand Island, Long 

 Pine. 



