THE NAUTILUS. 139 



impression seen only in anterior half, and there it is very faint. 

 Nacre dead-white in front half and iridescent and darker in the 

 other half, the two shades meeting in nearly a straight line. Width 

 2 inches, length !>, diameter |. 



Habitat : Neuse River, Raleigh, N. C. 



Remarks : Affinity, U. negatus Lea, from which our shell differs 

 in having rounded sides, olive epidermis, thinner and more direct 

 teeth. The peculiar structure of the epidermis reminds one of U. 

 estabrookianus Lea. Named for Mr. C. S. Brimley, of Raleigh, N. C., 

 who is collecting histological material. 



(To be Continued.) 







PLANORBIS NAUTILEUS L. IN AMERICA. 



BY GEO. \V. TAYLOR. 



In a note with the above heading in the February number of 

 THE NAUTILUS, Mr. Bryant Walker makes the following statement : 



" The occurrence of this well-known European species in the 

 United States has hitherto rested upon its discovery at Ann Arbor, 

 Michigan, by DeTarr and Beecher, who described it as new under 

 the name of P. costatus." 



This is true, no doubt, as far as the United States is concerned, 

 but it is not correct as to America, for P. nautileus has been already 

 recorded from three Canadian localities, and has, apparently, a wide 

 distribution in the northern part of the Continent. 



About eight years ago I received two specimens of P. nautileus 

 from Mr. A. W. Hanham, who had taken them near Hamilton, 

 Ontario. Five years later, in the autumn of 1893, 1 found the shell 

 myself in some abundance in the ponds near to the St. Louis Dam, 

 Ottawa. This find I recorded in a note in the Ottawa Naturalist for 

 December, 1893, mentioning, I think, in the same note, Mr. Han- 

 ham's previous discovery. Again, in 1894, I received numerous 

 specimens of the same shell from Mr. A. O. Wheelen, who collected 

 them in southern Alberta. These were also recorded by me in the 

 Ottawa Naturalist in a paper entitled " The Laud and Freshwater 

 Shells of Alberta." 



I was inclined, in the first instance, to think that this little shell 

 might have been introduced by the agency of man, but its occur- 



