The Diatomaceæ of Philadelphia and Vicinity

by Charles S. Boyer

Gaillonella granulata Ehr.

Orthosira punctata Wm. Sm.

Fresh water. Fossil at Coldspring, L. I.

Pl. [1], Fig. 10.

MELOSEIRA CRENULATA (EHR.) KUETZ.

Frustules cylindrical, with furrows on each side of the suture, 10-20 µ in diam.; puncta in longitudinal rows. Margins of valves denticulate at the junction of the frustules; valves with puncta scattered at the centre, radiate at the circumference.

Common in fresh water; quite variable in size.

Gaillonella crenulata Ehr.

Orthosira orichalcea Wm. Sm. in part; not Conferva orichalcea. Mertens or Gaillonella aurichalcea Ehr. and Bailey.

Pl. [1], Figs. 1 and 2.