THE DIATOMACE.E OF PHILADELPHIA AND VICINITY 39 



ANALYSIS OF SPECIES 



(In accordance, so far as it relates to our species, with the classification of C. 

 M ereschkowsky , Diagnoses of New Licmophorse, Nuova Notarisia, 1901.) 



Placatse valve narrow, striae very fine, septa superficial flabellata 



Dubiae valve bacilliform, septa shallow, frustule with thick 



walls ovulum 



Paradoxse valve with lower end produced, striae fine, pseudo- 



raphe distinct, septa deep paradoxa 



gracilis 

 tincta 

 baileyi ? 

 Lyngbyeae valve narrow, attenuated at both ends, distinct, 



septa deep lyngbyei 



Peristriatse valve broad, pseudoraphe wide, striae robust .... ehrenbergii 



LICMOPHORA FLABELLATA (CARM.) AG. 



Frustule elongate, narrow; valve narrow, lanceolate-cuneate, enlarged at the base; 

 striae very fine, 30 in 10 yu. 

 Echinella flabellata Carm. 

 Licmophora splendida Wm. Sm. 

 Common along the coast. 

 PI. 9, Figs. 1 and 2. 



LICMOPHORA OVTJLUM MER. 



Valve ovate, attenuated to the rounded inferior apex; pseudoraphe indistinct, striae 

 fine, 24 in 10 ju. Zone view broad, cuneate, angles rounded, inferior apex broad; frustule 

 robust, septa superficial, straight. (Mereschkowsky, in part.) 



Atlantic City. Common. 



PL 9, Figs. 8 and 9. 



LICMOPHORA PARADOXA (LYNG.) AG. 



Frustule broad, with rounded angles; septa curved; valve ovate, inferior apex produced. 

 Pseudoraphe distinct; striae varying from 25 below to 30 above in 10 ju. 

 Echinella paradoxa Lyng. 

 Rhipidophora paradoxa Kuetz. 

 Along the coast. 

 PL 9, Figs. 6 and 7. 



LICMOPHORA GRACILIS (EHR.) GRUN. 



Frustule cuneate, narrow, with sinuate margin; valve clavate, linear at the base; 

 striae, 20 to 22 in 10 /*. 



New Rochelle. Along the coast. 

 PL 9, Fig. 11. 



LICMOPHORA GRACILIS VAR. ELONGATA (KUETZ.) DE TONI 



As in the type, but more graceful and with deeper septa. 

 Rhipidophora elongata Kuetz. 

 Along the coast. Not common. 

 PL 9, Figs. 12 and 13. 



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