50 THE DIATOMACE.E OF PHILADELPHIA AND VICINITY 



SYNEDRA FULGENS (GREV.) WM. SM. 



Frustules geminate or flabellate on a stipe. Valve slightly inflated in the middle and 

 at the apices; pseudoraphe narrow; striae finely punctate, radiate at the ends. 

 Marine. Atlantic City. 

 PI. 11, Fig. 10. 



SYNEDRA AFFINIS KUETZ. 



Valve lanceolate; striae marginal, leaving a broad lanceolate pseudoraphe. 

 Common along the coast. 

 PL 12, Fig. 3. 



SYNEDRA AFFINIS VAR. PARVA (KUETZ. ) V. H. 



Valve lanceolate, slender; striae marginal, shorter than in the type. 

 Synedra gracilis Kuetz. 

 Common along the coast. 

 PL 12, Fig. 7. 



SYNEDRA AFFINIS VAR. TABULATA (AG.) V. H. 



Valve linear-lanceolate; striae, 11 in 10 /*, very short. 

 Not common. New Rochelle. 

 PL 12, Fig. 4. 



ASTERIONELLA HASSALL( 1855) 



(dim. of aster, a star) 



Frustules linear, slightly inflated at the ends, arranged in star-shaped clusters which 

 soon break up. Valve linear, unequally inflated at the ends. 



ASTERIONELLA FORMOSA HASS. 



Valve clavate at the ends; strise transverse, 17 in 10 n, pseudoraphe very narrow or 

 indistinct; an ovoid, hyaline area at each end. 



Newark, N. J. Broomall's Lake, Media (Palmer). 

 PL 12, Figs. 19, 20, 21. 



ASTERIONELLA INFLATA HEIB. 



Valve linear, capitate at each end and tumid in the middle; striae distinctly punctate; 

 pseudoraphe indistinct, or not apparent. L. 30 n. 

 Fresh water. May's Landing, N. J. 

 PL 12, Fig. 22. 



EUNOTIIN^E 



Eunotia. Frustules either free, in fasciae or epiphytic. Valves arcuate. 



Actinella. Frustules, solitary or in small clusters, cuneate. Valve inflated at one end. 



