PLEISTOCENE FOSSILS. 219 



This species is rare in the Pleistocene, but very common in all parts 

 of the gulf of St. Lawrence at present. Also west coast British 

 Columbia. * 



(3) Holothuridta. 



Psolus {Lophothuria) Fahricii, Dur. and Kor. 



Scales of an animal of this kind have been found in the Leda clay at 

 Montreal. They may belong to P. phantopus, or to the species 

 P. {Lophothuria) Fahricii, also found on our coasts ; from the form of 

 the plates, I suppose most likely to the latter species, and to a young or 

 small individual. P. Fahricii is very abundant at Little Metis, where 

 the other species also occurs. 



PROVINCE MOLLUSCA. 



Introductory. — In preparing this, the largest and most 

 important part of my catalogue, I have to acknowledge 

 my obligations to the late Dr. P. P. Carpenter, for his 

 kind aid in comparing all the more critical species of 

 shells, and in giving me his valuable judgment as to their 

 relations and synonymy, which I have in nearly every 

 case accepted as final. I am also indebted to Dr. Carpenter 

 for many of the notices of West-coast shells. 



To Mr. J. F. Whiteaves, F.G.S., I am indebted for 

 reviewing the Polyzoa and comparing them with Smitt's 

 I^orwegian catalogues, and also for many valuable facts as 

 to shells obtained in his dredgings in the gulf of St. 

 Lawrence. The Eev. T. Hincks, F.R.S., has also given me 

 valuable information on the Polyzoa. 



To the late Mr. J. Gwyn Jeffreys, F.E.S., and the late 

 Mr. R McAndrew, F.RS., of London, my grateful acknow- 

 ledgments are due for aid and information, and also for 



* Names of recent shells from British Columbia, except when other- 

 wise credited, are quoted from papers of Mr. Whiteaves on collections 

 of Dr. G. M. Dawson; Trans. R. S. Canada, Vol. IV., 1886; Geol. 

 Survey of Canada, 1878-9. 



