169. R. coraplanata, (Linn.) Dumort.

Miquelon Island, Gulf of St. Lawrence. (Delaware.) On the bases of trees, Jupiter River, Anticosti; on the bases of trees, Ste. Anne des Monts River, Gaspé Co., Que.; on rocks and trees at Ottawa, Ont.; on the roots of trees and on stones at Belleville, Hastings Co., Ont.; on rocks and trees, Queenston Heights, Ont., 1901; on rocks, Lake Nipigon, Ont.; abundant on the bases of trees in Algonquin Park, Ont., July, 1900; on trees, Red Deer River, Porcupine Mountains, Man.; on bases of trees and alders at Revelstoke, B.C.; on rocks, New Westminster, B.C.; on trees, Sea's farm, Victoria, Vancouver Island; on rocks and trees, Mount Benson, Nanaimo, Vancouver Island; on rocks and the bases of trees, Cape Breton Island, N.S., July, 1898; on the bases of trees, Roger's Pass, Selkirk Mountains, B.C., July 30th, 1890. (Macoun.) Sitka, Unalaska Island and Yakutat Bay, Alaska. (Evans.)

Radula Krausei, Steph., from Chilcoot, Alaska, is doubtfully referred here by Dr. Howe.

170. R. Bolanderi, Gottsche.

On rotten wood, Alert Bay, Vancouver Island, 1885. (Dr. G. M. Dawson.) On Acer circinatum at Hastings, Burrard Inlet, B.C.; on Douglas Fir and other young trees at Victoria, and on Alnus rubra at Comox, Vancouver Island. (Macoun.) Hot Spring, Una-laska and Sitka, Alaska. (Evans.)

Radula arctica, ,Steph., collected at Chlowak and Chilcat, Alaska, by the Drs. Krause, is referred here by Dr. Howe.

171. R. tenax, Lindb

On the bark of trees, Alert Bay, Vancouver Island, 1885. (Dr. G. M. Dawson?)