nfVEETEBRATE ANIMALS IN PALEOZOIC KOCKS. 617 



McGill University with a very large and instructive series of slabs 

 including a vast variety of forms, a few only of which have been 

 noticed in this paper. 



[I desire also to remark that the facts above detailed, together 

 with the discoveries of Annelid-jaws by Hinde and others, show 

 that the Marine Worms must have culminated, in regard to size, 

 abundance, and range of organization, at a very early geological 

 period. — September 9th, 189U.] 



I need not refer to the well-known and important observations of 

 Nathorst, Williamson, Owen, Miller and James of Cincinnati, Zeiller, 

 Salter, and others on this subject, or of the able defence of the 

 Algoid nature of some of them by Delgado, Saporta, and Crie. My 

 object has been merely to give some clear and instructive examples 

 which may tend to settle some of the points which have been in 

 dispute. 



The whole of the specimens referred to in the above paper are, 

 with many others, in the Peter-Redpath Museum of McGill Uni- 

 versity. A number of them are large slabs, of which only a portion 

 or a reduction could be given in the ])hotographs. 



§ IX. Notes. — I append, as an interesting impression, Photograph 

 XX. (not figured), which shows part of a rain-marked surface from 

 the Devonian of Gaspe, which has subsequently curled up and 

 cracked in drying, in the manner which may often be seen in modern 

 pools, when dried up. 



I should perhaps add that, after many unsuccessful attempts, I 

 have been able to find vegetable structure on only one specimen of 

 any of the so-called Algse of the Lower Palaeozoic rocks. This is a 

 flattened cj^linder referable to the genus Palceopliycus^ from the 

 Trenton Limestone. Its structure is somewhat imperfect, but 

 shows long sinuous tubes like those in the stems of some Laminarise. 

 All the other Algas of these older formations that I have met with 

 are either reduced to carbonaceous films destitute of structure or are 

 mere impressions without organic matter. 



[Since the above paper was written Mr. G. F. Matthew has 

 given (Amer. Journ. Science, ser. 3, vol. xxxix. 1890, p. 145) a 

 notice of some worm-burrows, from the Lower Cambrian of New 

 Brunswick, which he regards as similar to those described by 

 Torell from the Eophyton- and Fucoid-sandstones of Sweden, and 

 certain remarkable markings from the still older Animikie forma- 

 tion of Lake Superior. These last are of two kinds, curved divergent 

 marks (Taonichniies), and straight striae, crossing at acute angles 

 {Ctenichnltes). The specimens, from the Cambrian of Canada, re- 

 ferred to Eophyton seem, so far as known, to be of the nature of the 

 straight markings which I have elsewhere named Ehahdichnites. — 

 J. W. D., September 9th, 1890.] 



[Note. — Lesley (' Dictionary of Possils,' p. 1195) refers to a 

 specimen, found by Walcott, showing the shell of a large Mollusk 

 at the end of a track resembling liusiclmites, Billings and Nathorst 

 have shown that some transversely- wrinkled tracks may have been 

 produced by the foot of Gastropods. — J. W. D., October 2nd, 1890.] 



