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On rocks at low water mark, Pacific Beach, San Diego County, California.

In tide-pools and floating, Newport, Rhode Island.

At low water mark, Key West, Florida.

Washed ashore, La Jolla, San Diego County, California.

On wharf at life-saving station, Presidio, California.

In tide-pools, La Jolla, San Diego County, California.

Washed ashore, Pacific Beach, San Diego County, California.

On rocks, The Flats, Bermuda.

In tide pool, Spectacle Island, Penobscot Bay, Maine.

On rocks near high water mark, Marblehead, Massachusetts.

In ravine, Boswell, near Berkeley, California.

In a gelatinous mass on wet cliff, Pine Banks Park, Melrose, Massachusetts.

On rocks at about one meter depth, Montego Bay, Jamaica.

Washed ashore, Manchioneal, Jamaica.

Port Morant, Jamaica.

Washed ashore, Montego Bay, Jamaica.

Washed ashore, Jamaica.

Nahant, Massachusetts.

On rocks in litoral zone, La Jolla, California.

Popoff Island, Alaska.

Cast ashore in abundance on the west coast of Whidbey Island, Washington.

Cast ashore sparingly, probably growing in the sublitoral zone at from 30 to 40 meters, west coast of Whidbey Island, Washington.

Floating, west coast of Whidbey Island, Washington.

On stones in creek, near Minnesota Seaside Station, Vancouver Island, British Columbia.

Kingston Harbor, Jamaica.

Spectacle Island, Penobscot Bay, Maine.

Hot Sulphur Springs, Banff, Canada.

Lake Chabot, San Leandro, California.

On bark of Juniperus Bermudiana, Cinchona, Jamaica.

On stipes of Laminaria longicruris, South Harpswell, Maine.

Floating, Woodmont, Connecticut.

In stream above cascade, Melrose, Massachusetts.

In litoral zone, Marblehead, Massachusetts.

Ditches of salt works, Salinas Bay, near Guánica, Porto Rico.

On shells of live crabs, Revere Beach, Massachusetts.

On stipe of Laminaria longicruris, Harpswell, Maine.

On rocks at low water mark, Key West, Florida.

In a small meadow stream fed by a spring, near Richmond, California.

In a water trough by the roadside, Berkeley, California.

On rocks, Moss Beach, near Halfmoon Bay, San Mateo County, California.

Washed ashore, St. Lawrence River, Cap à l' Aigle, Quebec.

Floating in warm salt water from a power house, Oakland, California.

On Branchipus vernalis, in a shallow pool, dry in summer, Middlesex Fells, Massachusetts.

Abraham Bay, Mariguana, Bahamas.

In 3-30 dm. of water in a creek, growing closely associated with H. monile (P.B.-A., No. 1488), Watling Island, Bahamas.

Lower litoral, Barbados.

Catalina Island, California.

In a small pond in Middlesex Fells, Massachusetts.

Wood's Hole, Massachusetts.

In company with other desmids forming a green coating on stalks of plants in quiet water, Pine Hill Swamp, Medford, Massachusetts.