^L. Baileyana.^ Fronds two to five inches high; grows in tufts; filaments tubular, irregularly branched; branchlets often all on one side; branches and branchlets curved or arched, and tapered at both ends; color brownish-red. It is found washed ashore from Cape Cod southward. (Plate XXII.) GENUS ^Champia^ ^C. parvula.^ Frond two to six inches long, irregularly branched; grows in tufts; filaments hollow and constricted, so that they appear somewhat like a string of beads; color brownish-purple. It is found washed ashore from Cape Cod southward. (Plate XXIII.) GENUS ^Chylocladia^ ^C. articulata.^ Frond filamentous, three to twelve inches long, hollow, constricted at intervals; branches emanate from constricted joints; has the appearance of a series of pink, delicate, oval sacs. (Plate XXII.) GENUS ^Plocamium^ ^P. coccineum^ ("scarlet"). Frond a flat, semi-cartilaginous main stem one eighth of an inch, or less, wide, three to eight inches long, with alternate branches of unequal length emanating from the edges; branches have alternate branchlets arranged in groups of three or four in a row; branchlets have pinnulæ on the upper side, like the teeth of a comb (this peculiarity in branching makes the genus easy to identify); color dark lake-red. It is not found on the eastern coast, but is plentiful in California. (Plate XXIII.) SUBORDER ~DELESSERIEÆ~ GENUS ^Nitophyllum^ ^N. laceratum.^ Frond expands from narrow base and divides almost at once into long, narrow, strap-shaped segments; minute leaflets, showing [pg086] a dot or spore-cluster, occur at intervals on the margin; plant six to eight inches long; thin and silky in texture. Abundant on the California coast. (Plate XXIII.) ^N. Ruprechteanum.^ Frond one foot to two feet long, spreading from narrow base and dividing by forking into deep-cut, broad, strap-like lobes; top divisions rounded; traversed lengthwise by parallel veins; margin of the older parts bordered with a narrow frill of thin ruffled membrane which sometimes extends also over parts of the surface of the frond; substance somewhat rigid; color dark red to purple. It is found on the California coast. (Plate XXIV.) ^N. punctatum.^ Frond six to twenty inches long and of the same width, dividing in a forking manner; crowded at top; when in fruit, covered with dark dots; substance thin and silky; color rose-pink. It is found on the California coast. (Plate XXIV.) GENUS ^Grinnellia^ (/Named for Mr. Henry Grinnell of New York/)