no Clarence J. Elmore 



3. Gomphonema augur Ehr. Abh., p. i/. 1840. 

 PI. 14, fig. 535 ; pi. 23, fig. 849. 



Cordate-cuneate, 30-50 /* long, 9-12^ wide, upper end obtiise- 

 apiculate, lower end attenuate, slightly rostrate; striations about 

 10 in 10 /JL, granular, radiate, shortened on one side of the central 

 nodule, leaving a clear space in which is an isolated dot. 



In rivers, creeks, etc., also fossil: Anselmo, Crawford, Dismal River, 

 Dunning, Gordon Creek, Grand Island, Halsey, Hyannis, Oakdale, Seneca, 

 Stromsburg, Thedford, Trenton, Valentine. 



Fossil : Cherry County, Loup City, Spalding, Thedford. 



Rosebud, S. Dak." 



4. Gomphonema herculeanum Ehr. Ber., p. ^8. 1845. 

 PI. 14, fig. 536. 



Cuneate at both ends, 38-100 /x long, 12-22 /x wide, upper end 

 broadly rounded, lower end acute, sometimes attenuate ; striations 

 granular, alternating with a double row of granules, radiate, 9-10 

 in 10 /A, shortened in the middle, leaving a rounded hyaline space 

 around the central nodule containing an isolated dot. 



Snake River. 

 Fossil : Mullen. 



5. Gomphonema eriense Grun. Alg. Kasp. Meer., p. top. 18/8. 

 PI. 14, figs. 537-538; Pl- 23, fig- 848. 



Broadly lanceolate, 32-42 /* long, 12-14 /a wide; apex rounded; 

 striations radiate, shortened, leaving a rounded hyaline space 

 around the central nodule with very distinct isolated dot. The 

 specimens from Lake Erie are up to 90 fx long. 



With Lyngbya in Long Pine Creek, Long Pine ; New Helena, St. Paul. 

 Little White River, S. Dak.; pond on island in Lake Erie, Put-in Bay, 

 Ohio. 



6. Gomphonema lanceolatum Ehr. Amcr., pi. 2, I, 57. 184s. 

 GoinpJwncma lanceolatum Kiitz. BacilL, p. Sy, pi. 2g, fig. 75. 



1844. 



PI. 14, fig. 539. 



Lanceolate, clavate, 27-70/* long, 10-12 fx wide, gradually taper- 

 ing from the middle to the obtuse apex and base; striations granu- 

 lar, slightly radiate, 10-13 in 10 /a, shortened at the center, leaving 



