THE NAUTILUS. 43 



INDEX TO CONCHOLOGISTS' EXCHANGE. i 



AN INDEX TO THE " CONCHOLOGISTS' EXCHANGE." 



The publication of this magazine was commenced by Mr. Wm. 

 D. Averill, of Chestnut Hill, Philadelphia, in July, 1-S.sii. The 

 first number was printed on a postal card. The August number 

 (No. 2) consists of four pages, without pagination, size 5.] x 6J 

 inches. The September number contains six pages, without pagina- 

 tion. October number contains eight pages, which are numbered, 

 the first being page 11; the last page (18) is blank. November 

 number contains six pages. December number, eight pages and 

 the last page is blank. January and February numbers (1887) 

 each contain eight pages. March and April (Nos. 9 and 10) were 

 printed together as a " double number," which consists of twelve 

 pages. The May and June numbers each contain twelve pages and 

 are a little larger, 5* x 7 inches. Vol. I. complete, contains 84 

 pages. 



Vol. II, Nos. 1 and 2 (July and August, 1887) each contain 1(> 

 pages. September number contains 12 pages, and with this num- 

 ber there was another increase in size to 5| x 7-1. October and 

 November numbers each contain 16 pages. December number, 12 

 pages. January (1888) number, 12 pages, plus a cover (pp. i-iv) 

 of the same kind of paper. February number contains 8 pages and 

 a cover (pp. i-iv). March and April were printed together, but as 

 one number (No. 9) ; this contains 12 pages and a cover (pp. i-iv)i 

 and this was the last number published. Vol. II, complete, con- 

 tains 120 pages, exclusive of cover pages. No index to either vol- 

 ume was issued. The " Exchange " contains many new generic or 

 subgeneric names, with other important changes in nomenclature, 

 and some new species. The Index herewith given has been ar- 

 ranged to aid conchologists who have not access to a complete copy 

 of the original publication. It has been cut into short pages in 

 order that those who have the Conchologist's Exchange may bind 

 this Index with it. H. A. P. & C. W. J. 



