Valve lanceolate, with beaks or horns about half the length of the median part of the valve; keel puncta, 18 in 10 µ; striæ exceedingly delicate, "about 40 in 10 µ." L. 45 µ.
Fresh water. Darby Creek.
Pl. [33], Fig. 12.
Homœocladia AG. (1827)
(homoios, like, and clados, a branch)
Frustules like Nitzschia, but enclosed in branching or simple tubes.
HOMŒOCLADIA FILIFORMIS WM. SM.
Frustule linear, tumid in the middle, obtuse at the ends; valve linear-lanceolate, with somewhat acute apices; keel central or nearly so; keel puncta, 8 in 10 µ; striæ delicate. L. 108 µ.
Fresh and brackish water. Newark, N. J.
Pl. [33], Fig. 15.