112 ' Clarence J. Elmore 



Pools, rivers, etc. : Grand Island, Hyannis, Norfolk, Thcdford. 

 Fossil : Hay Springs, Loup City, Merriman, Spalding. 

 Sully's Hill", N. Dak. 



9. Gomphonema parvulum (Kiitz.) Rabenh. Fl. En. Alg., I, 



p. 2QI. 1864. 



Sphenella parvula Kiitz. BacilL, p. 83, pi. 30, fig. 63. 1844. 



PI. 15, figs. 557-561. 



Lanceolate-clavate, 19-30 /t long, 6-17 /x wide, apex rounded, 

 rostrate, or capitate; gradually tapering from the middle to the 

 base, which is sometimes slightly capitate; striations 12-14 in 10 /x, 

 nearly transverse, shortened on one side opposite the central 

 nodule, leaving a hyaline space in which is an isolated dot, often 

 indistinct. In the form called var. micropits, fig. 561, the stri- 

 ations are more distant, about 8 in 10 ^u.. Var. lanccolatum, fig. 

 557, is a more lanceolate form. 



Common attached to filamentous algae, sticks, stones, etc., also fossil: 

 Ainsworth, Auburn, Broken Bow, Brownlee, Cedar Creek, Cody Lake, 

 Crawford, Dismal River, Dunning, Ewing, Fairbury, Fremont, Glen Rock, 

 Gordon Creek, Grand Island, Hackberry Lake, Hemingford, Holt County, 

 Ithaca, Lincoln, Long Lake, Long Pine, Louisville, Mason City, Minden, 

 New Helena, North Platte, Oakdale, Orella, Orleans, Peru, Pleasant Dale, 

 Polk, Red Cloud, Ruby, St. Michael, Scottsblufif, Seneca, Stanton, Stroms- 

 burg, Talmage, Thedford, Valentine, Wahoo, Weeping Water, Whitman, 

 Willow Lake. 



Fossil : Agate, Cherry County, Greeley County, Loup City, Mullen. 

 Thedford, Williams's Canyon. 



Belvidere, Cutmeat, Kadoka, Rapid City, Rosebud, S. Dak. ; Devils Lake, 

 N. Dak. ; Cheyenne, Wj'O. ; Fresno, Cal. ; Blackhand, Ohio. 



10. Gomphonema angustatum (Kiitz.) V. H. Syn., p. 126, pi. 



24, figs. 48, 4p, fio. 188=^. 



Sphenella angustata Kiitz. BacilL, p. 83, pi. 8, fig. 4. 1844. 



PI. 15, fig. 562. 



Cuneate, 30-44 /a long, 7-8 ju, wide, nearly symmetrical to the 

 transverse axis, but the upper end somewhat larger, both ends 

 more or less capitate; striations delicate, 8—12 in 10 /a, radiate, 

 shortened on one side of the central nodule; isolated dot indistinct. 



In creek, Andrews. 



