THE NAUTILUS. Ill 



In some ofthei^e countries the amount realized from sales to collec- 

 tors exceed the amount of revenue derived from their use for postal 

 purposes, and when they desire to increase their revenue, they strike 

 off a lot of "New Issues," or, by printing a different value on the 

 " Old Issues," and placino- an additional charge upon them meet 

 with large sales. They even go so far as to deliberately make errors 

 in these so-called " Surcharges " and thus create a demand for these 

 manufactured " rarities," which seems to me to be a parallel case 

 with some dealers and others interested in the Conchological Ex- 

 change. 



Lorenzo G. Yates. 



GENERAL NOTES. 



The Boston Society of Natural History has purchased from Mr. 

 Gulick a valuable series of sevei-al hundred Hawaiian Achatinella. 

 Those from the island of Oahu, are to be mounted on a large model 

 of that island, made by J. H. Emerton. They will occupy their 

 respective localities on the mountains and in the valleys, and will 

 illustrate the progression and variation of species from the various 

 centers. I have suggested to the Curator that a similar model be 

 made to show the distribution of the Fatula strigosa group taking 

 HemphiU's fine series as a basis. — E. W. Jiopei', Revere, 3Iass. 



