40 THE NAUTILUS. 



were added to it. Then I copied the whole list, leaving space for 

 the introduction of species not listed. But in some cases the blank 

 spaces were not needed while more space was required for families 

 and genera not represented in the book. Again I copied the entire 

 catalogue, excepting the west coast species which I listed on cards to 

 form a card catalogue. In time this second book began to look far 

 from neat, so I tried a new plan. I used " Ward's Catalogue of the 

 Mollusca," marking with a small mark such species as I had, and 

 inserted blanks between the printed leaves for species that were not 

 found in the price list ; but this made the pamphlet rather bulky and 

 also necessitated my looking over two lists, the printed one and the 

 written one, in order to find if I had certain species. The plan was 

 satisfactory at first, then I thought out a better one which I will 

 give you. 



I used a patent cover for blank leaves such as students use for 

 laboratory notes, examination papers, etc., in colleges and schools. 

 I bought paper the proper size for the cover, about eight by ten 

 inches. This paper had holes stamped out at the right place for the 

 metal clasps to be inserted. I use ruled paper, as names and locali- 

 ties are quickly seen on the same line, but this is a matter of taste, as 

 dots can mark the space between names of shells and their localities. 



The classification is a matter of choice. I use the same as that 

 found in "Tryon's Structural and Systematic Conchology " for 

 marine shells, excepting the west coast shells, for which I use an- 

 other classification. My reason for using Tryon's is, if I get a shell 

 from a family new to me I know where to list it immediately by re- 

 ferring to the Systematic Conchology, for by constantly studying and 

 referring to this work I have become tolerably conversant with the 

 classification. 



I wrote only on one side of the paper when making out this new 

 list, and paged only this side. This left a blank opposite each page 

 to be used if the page became full. This blank page I numbered 

 alphabetically to correspond with the numbered page. For example, 

 if I required the blank leaf opposite page 5, I numbered it 5% and if 

 I found it necessary to add new leaves at this place they would be 

 paged 5 b , 5, 5 d , etc. on the left page, on the right 5 1 , 5 2 , 5 s , etc. 

 The possibility of adding new leaves, one after another, or of taking 

 out and rewriting the leaves is the strong feature in favor of using 

 these covers. The use of the alphabet, or as much of it as is needed 



