34 THE DIATOMACE.E OF PHILADELPHIA AND VICINITY 



TERPSINOE EHR. 

 (terpsinoos, gladdening?) 



Frustules quadrangular, adnate in filaments, usually free. Valve elliptical or triangu- 

 lar, with undulating sides divided by septa into three or more sections. 



TERPSINOE AMERICANA (BAIL.) RALFS 



Valve lobed at each end or angle. Central space rounded, hyaline. Surface with fine 

 puncta in radiating lines. 



Blue clay. Not common. 

 PI. 6, Fig. 10. 



TERPSINOE NOV^E-CvESARE^] BOYER 



Valve triangular, with concave sides and broad angles equally three-lobed, separated 

 from the central part by septa. Central space small or absent. Puncta delicate, radiating 

 or scattered. L. of side 62 n. 



Pleistocene clay at Buckshutem, N. J. Fossil at Wildwood, N. J. 



T. americana, forma trigona Pant.? (Le Diatomiste, Vol. 2, p. 207.) 



PI. 6, Fig. 11. 



(<J) EUODIE^E 



EUODIA BAIL. (1860) 



(derivation uncertain; apparently from euodia, fragrant, probably a euphemism) 

 Frustule in zone view cuneate. Valve semi-lunate, coscinodiscoid. 



EUODIA GIBBA BAIL. 



Valve with rounded markings, larger and scattered at the centre, radiating at the cir- 

 cumference and in indefinite straight rows at the semi-radius. 



Delaware Bay (Mann). 



PI. 5, Fig. 1. 



I have not seen this in the Philadelphia material. The figure is drawn from a speci- 

 men from the Gulf Stream, S. Atlantic. 





