132 



Clarence J. Elmore 



k. Valves linear, large, striations 



distinct. 



12. Lincares, page 143. 

 kk. Valves lanceolate, small , 



striations indistinct. 



13. Dissipatae, page 144. 

 AA. Valves long-rostrate with very excentric keel. 



14. Nitschiclla. page 145. 

 AAA. Cells in a gelatinous tube. I5- Homoeocladia, page 145. 



I. Hantzschia 



A. Carinal dots not elongated. i. H. amphioxys. 



AA. Carinal dots elongated. 2. H. virgata. 



I. Homoeocladia amphioxys (Ehr.) Kiintze. Rev. Gen. Plant., 

 Ill, p. 408. 1898. 



Hantzschia ampJiio.rys (Ehr.) Grun. in CI. & Grnn. Arct. Diat., 

 p. 10^. 1880. 



Eunotia anipJiioxys Ehr. Amer., p. 12^. 184^. 



PI. 18, figs. 672-680. 



More or less curved, 34-192 /a long, 10-18 ^a wide; apices more 

 or less rostrate; carina marginal with 4-7 round dots in 10^, the 

 two central dots slightly more separated, carinae of the two valves 

 on the same side of the cell. fig. 680; striations granular, 10-15 

 in 10 fjL. Very variable and presenting several forms called va- 

 rieties. Var. major, figs. 672, 674; var. elongata, fig. 673; var, 

 vivax, figs. 675, 679. 



Very common under all conditions where any diatoms can grow ; creeks, 

 springs, ponds, rivers, tanks, stagnant ditches, etc., also fossil : Ainsworth, 

 Anselmo, Benkleman, Brock, Broken Bow, Brownlee, Burge, Central City, 

 Cherry County, Clear Lake, Columbus, Crawford, Culbertson, Dismal 

 River, Dunning, Emerald, Gordon Creek, Grand Island, Hackberry Lake, 

 Haigler, Halsey, Hemingford, Holbrook, Holt County, Hyannis, Ithaca, 

 Lakeside, Lincoln, Lodi, Long Pine, Louisville, Milford, New Helena, 

 Norfolk, North Platte, Oakdale, O'Neill, Orella, Orleans, Pelican Lake, 

 Peru, Pleasant Dale, Red Cloud, Ruby, Rupert, St. Libory, St. Michael, St. 

 Paul, Seneca, Seward, Sheridan, County, Snake River, Stanton, Talmage, 

 Tekamah, Thedford, Trenton, Valentine, Wann, Watts Lake, Weeping 

 AVater, West Point, Whitman, Woodlake. 



Fossil : Agate, Cherry County, Greeley County, Hay Springs, Loup City, 

 Mullen, Thedford, Valentine, Wheeler County. 



