THE NAUTILUS. 43 
INDEX TO CONCHOLOGISTS’ EXCHANGE. 1 
AN INDEX TO THE ‘‘ CONCHOLOGISTS’ EXCHANGE.” 
The publication of this magazine was commenced by Mr. Wm. 
D. Averill, of Chestnut Hill, Philadelphia, in July, 1886. The 
first number was printed on a postal card. The August number 
(No. 2) consists of four pages, without pagination, size 53 x 63 
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, 53 x 7 inches. Vol. I, complete, contains 84 
pages. 
Vol. I, Nos. 1 and 2 (July and August, 1887) each contain 16 
pages. September number contains 12 pages, and with this num- 
ber there was another increase in size to 5% x 72. 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 tpgether, but as 
one number (No. 9); this contains 12 pages and a cover (pp. i-iv)» 
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. 
