(_b_) MERIDIONEÆ Valve symmetrical in zone and valve view along the sagittal line, but asymmetrical to the transverse axis, cuneate. In zone view sometimes with wedge-shaped septa. Valve finely striated, without central and usually without terminal nodules; a pseudoraphe present. _Licmophora._--Frustules cuneate in stipitate fan-shaped fascicles. _Meridion._--Frustules cuneate in spiral fascicles. LICMOPHORA AG. (1827) (licmos, a fan, and phoreo, I bear) Frustules wedge-shaped, joined together into fan-shaped, stipitate fascicles. Valve cuneate, rounded at both ends, septate. Chromatophores granular, round or oval in our species. {39}ANALYSIS OF SPECIES (In accordance, so far as it relates to our species, with the classification of C. Mereschkowsky, Diagnoses of New Licmophoræ, Nuova Notarisia, 1901.) Placatæ--valve narrow, striæ very fine, septa superficial flabellata Dubiæ--valve bacilliform, septa shallow, frustule with thick walls ovulum Paradoxæ--valve with lower end produced, striæ fine, paradoxa pseudoraphe distinct, septa deep gracilis tincta baileyi ? Lyngbyeæ--valve narrow, attenuated at both ends, distinct, septa deep lyngbyei Peristriatæ--valve broad, pseudoraphe wide, striæ robust ehrenbergii LICMOPHORA FLABELLATA (CARM.) AG. Frustule elongate, narrow; valve narrow, lanceolate-cuneate, enlarged at the base; striæ very fine, 30 in 10 µ. _Echinella flabellata_ Carm. _Licmophora splendida_ Wm. Sm. Common along the coast. Pl. 9, Figs. 1 and 2. LICMOPHORA OVULUM MER. Valve ovate, attenuated to the rounded inferior apex; pseudoraphe indistinct, striæ fine, 24 in 10 µ. 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; striæ varying from 25 below to 30 above in 10 µ. _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; striæ, 20 to 22 in 10 µ. 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. {40}LICMOPHORA TINCTA (AG.) GRUN.