84 Clarence J. Elmore 



cc. Apices acute, about 14 striations in 10 m. 



49. N. fulva. 

 bb. Rectangular, apices abruptly pointed. 50. A'', mucronaia. 



AA. Apices capitate. 5i- A^ ainbigua. 



46. Navicula guatamalensis CI. & Grnn. in Le Diafomiste, 11, 

 p. 144, pi. g, fig. 2. 



PI. 10, fig. 368. 



" Linear-lanceolate, obtuse at the ends, length 1 1 5-202 jn, breadth 

 18-32^; median line straight, bordered by a narrow axial area; 

 terminal fissures curved in the same direction ; with transverse and 

 longitudinal striations, the transverse parallel, 11 in 10 /x, the longi- 

 tudinal 23 in 10 ju,. Hab. fresh water, Guatamala, fossil." "It 

 is quite near A^. cuspidata and differs from it in outline and finer 

 striation." Our specimens agree with the description except that 

 in size they are from 124 to 211 ;u, long and from 27 to 34 ,u wide 

 with 10 striations in 10 fx. 



With Chara in Phalaris Lake and at Whitman. 



49. Navicula fulva (Nitz.) Ehr. Inf., p. lyj, pi. ij, fig. 6. 18^8. 



Bacillaria fulva Nitz. Beitr., p. 8/, pi. 3, fig. ip. iSiy. 



Navicula cuspidata Kiitz. Bacill., p. p4, pi. 3, figs. 24, 57. 

 1844. 



PI. 10, figs. 369-373. 378-380, 382. 



Broadly lanceolate, 31-200 /a long, apices slightly enlarged or 

 acuminate ; striations nearly perpendicular to the raphe, slightly 

 radiate, about 14 in 10^, extending nearly to the raphe, leaving a 

 very narrow space which is slightly enlarged opposite the central 

 nodule. 



Common in creeks,- ponds, tanks, etc. : Ainsworth, Andrews, Arago, 

 Aspinwall, Auburn, Broken Bow, Central City, Cherry County, Clear Lake, 

 Columbus, Culbertson, Dewey Lake, Dismal River, Dunning, Emerald, 

 Emmett, Fremont, Grand Island, Hackberry Lake, Haigler, Halsey, Hem- 

 ingford. Holt County. Hyannis, Johnson, Julian, Lakeside, Lincoln, Long 

 Lake, Long Pine, Milford, Minden, New Helena, Norfolk, North Platte, 

 O'Neill, Orella, Orleans, Pelican Lake, Peru, Pleasant Dale, Red Cloud, 

 Rupert, Rulo, St. Paul, Seward, Sheridan County, Snake River, Stanton, 

 Stromsburg, Talmage, Thedford, Trenton, Valentine, Wann, Weeping 

 Water, West Point, Whitman. 



Fossil : Agate, Cherry County, Greeley County, Hay Springs, Merriman, 

 Mullen, Thedford, Valentine, Wheeler County. 



