The occurrences herein described have been brought to light as a result of the work of the Road Materials Division of the Geological Survey of Canada. Those at Ste. Monique and at Husereau's Farm, near Oka, were discovered by Mr. H. Gauthier in 1916 (1), and those at Isle Cadieux, Como and Cascades Point were discovered by Mr. R. H. Picher in the same year (2). It is owing to the kindness and courtesy of Mr. William McInnes, at that time directing geologist of the Geological Survey of Canada, and of Dr. L. Reinecke, at that time chief of the Road Materials Division of the Geological Survey of Canada, that the writer has been given the opportunity of studying these rocks.

In 1902 the author proposed a new classification of the genus Lichas, introducing several new subgeneric names. Gürich's valuable paper dealing with the same subject, which was published late in 1901, unfortunately only came into his hands after his article was in the press, so that full justice could not be done to it. Since that time a considerable amount of work has been done on the genus Lichas, but the principles governing the classification put forward in 1902 have not been upset, and no fundamental modifications have been introduced, though many new species have been described and several new subgeneric or generic divisions have been established.

The rock fragments described herein were obtained during a cruise of investigation into the fishery possibilities of the Lousy Bank. This Bank, as defined by the 200 fathom line, is some 34 miles long, by 18 miles broad, and lies in a direction E.N.E.–W.S.W. (mag.), being situated between Faroe Bank and Rockall, and having its shallowest portion centred around the position, Lat. 60° 25′ N., Long. 12° 37′ W.

The serpentine rocks belonging to the metamorphic region of Connemara, West of Ireland, fall into two classes, the ophicalcites and the serpentinized basic igneous rocks.

The existence of exceptionally beautiful pale green and yellow serpentine and variegated ophicalcites is well known. At one time these deposits were quarried at several points, notably at the Lissoughter Quarry near Recess, the Derryclare Quarry on the eastern shores of Derryclare Lough, the Barnaoran Quarry near the head of the Owenglin River which flows into Clifden Bay, and at the Streamstown Quarry situated at the head of Streamstown Bay. There are, however, a number of other localities scattered through the region where small occurrences of ophicalcites and serpentinized igneous rocks are to be found.