igoo] Lambe — Notes on Hudson Bay Sponges. 279 



specimen. The spicular similarity between the Leda clay sponge 

 and Ci'uuieLla crmiiimi has already been pointed out by the writer, 

 (vide Transactions Royal Society of Canada, second series, vol. 

 ii, 1896). Mr. VVhiteaves has recoj^nized among-st the shells 

 dredged by Mr. Low with this sponge, some of the species consid- 

 ered typical of the Leda clay in eastern Canada, notably — Pecfen 

 Groenlandicus, Sowerby, Modiolaria dhcors, Z., Portlandia glaci- 

 nhs, [Wood), Nucula tenuis, M ntagu, Macoma sabulosa, Spengler 

 [ca/carea, Huct.) i\nd Saxicava arctica, L Judging from this we 

 evidently have in Hudson Bay a deposit, in course of formation, 

 that has a fauna to a la-ge extent the same as that revealed to us 

 by the Pleistocene fossils of the Leda clay. 



ArPENDIX TO PRESIDENT'S ADDRESS DELIVERED 

 BEEORE THE OTTAWA FIELD-NATURALISTS' 

 CLUB. 



Sir John William Dawson has contributed so many papers, 

 volumes and articles to Science, P^ducation and Literature in 

 general that it will be some time before a complete list of his 

 writings can be produced. 



I have attempted, in this issue of The Naturalist, to submit 

 as complete a list of Sir William's writings as I have been able to 

 gather to date. It forms part of my presidential address, de- 

 livered November 28th, 1S99. before the Ottawa Field-Naturalists' 

 Club, and especially to that portion (pp. 270 — 274) referring to the 

 life and works of Sir William Dawson. 



I desire to acknowledge with thanks valuable assistance re- 

 ceived from Dr. G. M. Dawson ; the Librarian of the Parliament 

 of Canada, Mr. Martin J. Griffin ; the Librarian of the Peter 

 Redpath Library of McGill College, Montreal, Mr. C. H. Gould ; 

 Mr. Scott, Librarian of Princeton University, Princeton, New 

 Jersey ; Prof. D. P. Penhallow ; Sir John Bourinot, Hon. Sec. 

 of the Royal Society of Canada, Ottawa, and Prof. David White, 

 of the Smithsonian Institution, Washington, D.C. 



H. M. A. 



