54 THE DIATOMACE.E OF PHILADELPHIA AND VICINITY 



EUNOTIA BACTRIANA EHR. 



Valve linear, apices revolute, acute, dentate on the dorsal margin, with one acute 

 crena near each end. 



Tom's River, N. J. Rare. 

 PL 13, Fig. 18. 



EUNOTIA BIDENTULA WM. SM. 



Valve with straight ventral margin, and with two undulations on the dorsum; apices 

 large, rounded. 



May's Landing, N. J. Rare. 



PL 13, Fig. 20 (not Schumann's form, which has angular crenae). 



EUNOTIA FORMICA EHR. VAR. ? 



Valve turgid in the middle and at the apices which are unilaterally truncate. 



Pensauken, N. J. (artesian well). 



PL 13, Fig. 26 (not a typical form). 



The following are forms which appear to be indeterminate, or, in any case, are scarcely 

 worthy of distinction by specific names, as might be said of others of the innumerable 

 variations of this genus : 



Fig. 23, PL 13, probably a form of prserupta. Newtown Square. 



Fig. 28, PL 13, from the blue clay. 



Fig. 29, PL 13, an asymmetrical form, apparently abnormal, but not rare at May's 

 Landing, N. J. 



Fig. 17, PL 38. Valve convex on the dorsal side, incised on the ventral; striae about 

 15 in 10 n, closer at the ends; L. 30 ju- Schuylkill River. 



Fig. 18, PL 38. Valve arcuate, asymmetrical, broader at one end; terminal nodules 

 large; striae, 10 in 10 n; L. 47 M. Gloucester, N. J., artesian well. 



Numerous variations of the above species are illustrated in Schmidt (Atlas, Pis. 

 285-291). 



ACTINELLA LEWIS (1865) 

 (dim. of actin, a ray) 



Frustules solitary, or in small clusters, sub-cuneate or nearly linear. Valve arcuate, 

 rounded at one end and suddenly widened at the other into a cup-shaped or lychnoid 

 inflation. 



ACTINELLA PUNCTATA LEWIS 



Valve with fine, transverse striae; on the margin, puncta at intervals; terminal nodules 

 distinct. 



May's Landing, N. J. 



PL 12, Figs. 16, 17, 18. 



Fig. 17, from Tom's River, N. J., is an approach toward A. brasiliensis Grun. 



Fig. 18 represents the frustules geminate, a frequent occurrence. 



