No. 4.] DAWSON — POST-PLIOCENE. 405 



Addenda to Echinodermata. 



Mr. T. Curry of Montreal has been so fortunate as to find in 

 the Leda clay near that city, in addition to fragments apparently 

 of an OphlogJyplia, a specimen probably of Ophiacaniha spinu- 

 /osa, Muller and Tr., and one of Solaster pajjposa, Linn. Both 

 of these are species now found in the Gulf of St. Lawrence. Mr. 

 Matthews has also obtained a second species of Ophiurid Starfish 

 at St. John. 



Simmiary of Fossils. 



The above lists include, in all, about 205 species, being more 

 than twice the number included in previous lists, and distributed 

 as follows : 



Plants 10 



Animals^ — Radiata 24 



Mollusca 140 



Articulata 26 



y ertebrata 5 



205 



The whole of these, with the three or four exceptions, may 

 be affirmed to be living Northern or Arctic species, belong- 

 ing in the case of the marine species, to moderate depths, or 

 varying from the littoral zone to say 200 fathoms. The assem- 

 blage is identical with that of the northern part of the Gulf of 

 St. Lawrence and Labrador Coast at present, and diflfers merely 

 in the presence or absence of a few more southern forms now 

 present in the Gulf, especially in its southern part, where the 

 fiuna is of a New England type, whereas that of the Post-plio- 

 cene may be characterized as Libradorian. As might have been 

 anticipated from the relations of the Modern marine fauna, the 

 species of the Canadian Post-pliocone are in great part identical 

 with those of the Greenland seas and of Scandinavia, where, 

 however, there are many species not found in our Post-pliocene. 

 The Post-pliocene fauna of Canada is still more closely allied to 

 that of the deposits of similar age in Brit lin and in Norway. 

 Change of climite, as I have shewn in previous papers, having 

 been much more extensive on the east than on the west side of 

 the Atlantic, owing to the distribution of warm and cold currents 

 resulting from the present elevation of the land. 



