THE NAUTILUS. 



Advertisements will be inserted at the rate of $1.00 per 

 inch for each insertion in advance. Smaller space in propor- 

 tion. A discount of 25 per cent, will be made on insertions of 

 six months or longer. 



Je||e Jone§ & Go 



PAPER BOK MANUFACTURERS, 

 PHILADELPHIA. 



615 COMMERCE STREET, 

 Make a Specialty of Trays for Exhibiting Specimens. 



CONCHaLOSr--G£OLO&y--ZOOLOSY, ETC., ETC. 



Robert F. Damon, Weymouth, has the largest variety of 

 Natural History Specimens to be seen in England. 



Abridged Catalogue on application. 



Foreign collectors who are willing to exchange or sell Rare 

 and New species of Shells will kindly communicate with 

 Mr, Damon. 



A beginner wishes to obtain shells for his collection — Land and 

 Marine Univalves— address, 



"SHELLS," care of Editor Nautilus, 



Acad. Nat. Sciences, Philadelphia. 



Tolles Achromatic Triplets. — A set of three of these well 

 known lenses, formerly the proi^erty of the late curator of the 

 Princeton Museum, are for sale by his ftimily. They are highly 

 recommended. Address, Prof. W. B. Scott, Princeton University, 

 Princeton, N. J. 



