Reports and Proceedings — Geological Society of London. 279 



In the third note proofs are shown that favour the view that the 

 Upper Etcheminian fauna (Basal Cambrian) invaded Eastern Canada 

 from the south-west. 



In connection with the fourth note, in which the Brachiopodous 

 shells of the Cambrian fauna of Mt. Stephen in British Columbia are 

 dealt with, is the description of a new species of Metoptoma^ 



I^.SI=OI^TS -A.IsrXD I=>I^OOEiElX)II^^G-S. 



Geological Society of London. 



I. — April 29th, 1903. — J. J. H. Teall, Esq., M.A., E.E.S., 



Vice-President, in the Chair. 



Prof. Bonney, in exhibiting three specimens found by Prof. Collie, 

 F.R.S., on Desolation Valley Glacier, east of the watershed of the 

 Eocky Mountains and a little south of the Canadian Pacific Railway, 

 pointed out that one, a slab of white quartzite, was covered by 

 horizontal worm-burrows, often about one-third of an inch in 

 diameter, such as those named Planolites by Nicholson ; another, of 

 the same material, had blunt ridges, tapering to a point, an inch or 

 so long, rudely parallel, in sets of about four. These he should 

 have taken for the tracks of a (?) Crustacean, but they were single, 

 not paired, and without an}' sign of a medial furrow. The third 

 was a slab, measuring about 11 by 5 inches and 1^ inches thick, of a 

 brownish quartzite, passing quickly on one side into a green ai'gillite, 

 the other side being thickly studded with dome-like eminences about 

 an inch in diameter and nearly half this in height. Most of them 

 show a slight ' dimple ' at the top, and a very slight ' step ' or 

 swelling often forms a sort of ring part way up the dome. Some 

 argillite, like that on the other side, remains about their bases, and 

 a few tracks of Planolites wind among them, and once or twice seem 

 to pass over them. The domes are formed of a quartzite, identical 

 with that of the slab. It shows a very faint stratification, and 

 consists of grains of quartz, not seldom well rounded, embedded in 

 a minutely micaceous matrix, probably an alteration product of 

 felspar. They cannot be concretions ; so the speaker regarded them 

 as the casts of pits in the argillite, made by a large annelid, which 

 retreated into it vertically (? Scolithiis), afterwards filled up by a 

 layer of sand. 



The following communications were read : — 



1. "The Age of the principal Lake-Basins between the Jura and 

 the Alps." By Charles S. Du Riche Preller, M.A., Ph.D., A.M.I.C.E., 

 M.I.E.E., F.R.S.E., P.G.S. 



(1) In a paper read before the Society last session, the author 

 showed, on the evidence of extensive high-level deposits of Decken- 

 schotter in Subalpine France and Switzerland, that the principal 

 Swiss lake-basins could not have existed at the time when those 

 deposits were formed, during and after the first or Pliocene glaciation 

 of the Alps. In the present paper he deals with the question reserved 

 in the preceding one, that is, to which subsequent period the forma- 

 tion of those lake-basins should be assigned. By the light of further 



