PLEISTOCENE FOSSILS. 263 



Recent— Coast of Nova Scotia. I have obtained specimens from Mr. 

 Downes of Halifax, but have not elsewhere seen the species recent. 

 It is B. Uddevallensis of lists of Scandinavian fossils and B. tulipa of 

 Mil Her. It is a widely difiused Arctic and North Atlantic species. 



This Acorn-shell is very abundant at Riviere-du-Loup, and fine 

 specimens are found entire, attached to stones and boulders in the 

 boulder-clay. 



Very fine specimens are also obtained at River Beaudette, about 

 34 miles west of Montreal. This locality is noteworthy as being 

 further west than the others mentioned. The specimens are also 

 interesting from their remarkable perfection and the large masses 

 which they form, some of which contain as many as a dozen individuals 

 attached to each other. They were collected by Mr. A. W. McNown, 

 of Riviere Beaudette, and by Mr. Stanton, C.E., of Lancaster. 



The animals seem to have been covered, when living, with an irrup- 

 tion of sand, for the opercular valves of many of them are still in place, 

 and, owing to a slight infiltration of calcareous matter, the radial plates 

 and opercular valves have been cemented together, which accounts for 

 their perfect preservation. It is to be observed, however, that the 

 shells of Balani are composed of a remarkably dense and indestructible 

 calcium carbonate, much less perishable than the shells of most mollusks. 



The original attachments of the animals, so far as observed, have 

 been on pebbles on the surface of clay, and as these afforded space only 

 for one or two individuals, the young were obliged to attach themselves 

 to the old in successive generations, forming grotesque groups, which 

 still remain entire. They are associated M'ith 8axicava rugosa, Mya 

 arenaria and Macoma Ormnlandica. 



Balanus porcatus. DaCosta. 



Fossil — Beauport ; glacial beds of Europe. 



Recent— Gulf St. Lawrence, and coast of New England ; Labrador 

 (Packard) ; and Arctic and Northern seas generally. It is no doubt 

 Lepas balanus of Fabricius from Greenland. 



Much more rare in the Pleistocene than the preceding species. 



Balanus crenatiis. Brug. 



Fossil— Montreal ; Quebec ; Riviere-du-Loup ; Anticosti ; St. John, 

 N.B. (Matthew) ; Labrador (Packard) ; Portland, Maine ; glacial beds 

 of Europe ; Vancouver Island (G . M. D. ) 



Recent— Arctic and northern seas, Greenland ; Gulf St. Lawrence 

 and American coast. It seems to be Lepas halanaris of Fabricius, 

 from Greenland. 



