THE - CONCHOLOGISTS’ - EXCHANGE. 
On 
“I 
“Check List of Shells,” besides numerous articles 
of interest to the conchologist, at the following 
prices: 
Wolsiercompleties.” ; ==) «4. $1 50 
Vol. I, minus Nos. 1 and 2, . 1 00 
Vol. II, complete, ‘ 1 00 
Vol. III, complete, 75° 
Postage extra in each case at the rate of six (6) 
cents per volume. 
American Journal of Science and Art. 
Vol. XT, 1876. Unbound. Complete $3.75, postpaid. 
ADDRESS 
The Conchologists’ Exchange 
CHESTNUT HILL, 
PHILADELPHIA, PA., U.S. A. 
OUR PREMIUM LIST. 
A CHANCE FOR WORKERS KEEN AND BRIGHT. 
Send $1.75 and the names of 5 subscribers, and we 
will forward to the originator of the club, $1.00’s 
worth of shells at List Prices. 
Prof. J. E. Kingsley’s ‘Naturalists’ Assistant,” 228 
PREMIUMS IN SHELLS. 
To every person sending us before December J, 
1887, the names and cash subscriptions (at the Club- 
Rate of 35 cents per annum), of 100 persons (new 
| Subscribers), a choice collection of shells consisting 
of 150 species and 500 specimens. 
To every person sending 50 names with the accom- 
panyiug cash a collection of 75-species and 250 speci- 
mens. 
To every person sending 25 names and the cash, 
will be sent a collection of 40 species and 125 speci- 
mens. 
. 
These offers consist of choice shells in fine condi 
tion with correct nameand locality in each instance; 
and will furnish numerous duplicates for exchange. 
A few of the genera from which the above will be 
selected are as follows: Nautilus, Murex, Neptunea, 
Pyrula, Cassidulus, Pleurotoma, Triton, Ranella, 
Nassa, Purpura. Cuma, Harpa, Oliva, Fasciolaria, 
Littorina, Goniobasis, Paludina, Ampullaria, Crepi- 
dula, Nerita, Neritina, Turbo, Trochus, Haliotis, 
Chiton, Helix, Bulimus, Achatina, Achatinella, 
Clausilia, Planorbis, Lymnza, Cyclostoma, Physa, 
Pholas, Mactra, Tellina, Donax, Venus, Cytherea, 
| Tapes, Cardium, Unio, Anodonta, Modiola, Arca, 
' Pecten and others. 
pages, will be sent, post-paid, for $5.25 and the names | 
of 15 subscribers. 
Prof. Josiah Keep’s,‘‘ West Coast Shells” will be 
sent free for $8.75 and the names of 25 subscribers. 
Woodward’s “Manual of the Mollusca,” 1880 edi- 
tion, will be sent free for $10.50 and the names of 
30 subscribers. 
Tryon’s “Structural and Systematic Conchology,” 
cheap edition, will be sent free for $17.50, and the 
names of 50 subscribers. 
Tryon’s “Monograph of the* Terrestrial Mollusca 
of the United States,” plain edition, will be sent free 
for $35 and fhe names of 100 subscribers. 
Sowerby’s “Genera of recent and Fossil Shells,’ 
264 plates. 44-morocco, 2 volumes, 8vo. sent free for 
$52.50 and the names of 150 subseribers. 
AND LOOK 
8a For $87.50 and the names of 250 subscribers, 
we will send, express prepaid, one of 
Queen’s Educational Microscopes, 
mounted upon a brass tripod stand, with adjustable 
eyepieces, object glasses and diaphragm complete. 
A fine chance for an active worker. 
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These offers are made simply to increase the pop- 
ular interest in that beautiful and highly interesting 
study—Conchology, as well as to extend the subserip- 
list of Tuk ConcnonoGists’ EXCHANGE, a 
monthly publication to which every shell collector 
should subscribe. 
Special Notice. 
We have made 35 cents the price for Clubs of 5 or 
more subscribers, and in no case will individual 
subscriptions be received at less than the new rate 
of 50 cents. By request the above Lists will be held 
open until December 1, 1887,so that those who in- 
tend to subscribe will find it ta their advantage to 
forms Clubs of five or more and thus secure the 
benetit of the reduction. In addition to these splen- 
did Premiums every subscriber to Volume IT has a 
premium in the shape of three (3) free exchanges 
annually. 
Parties desiring to secure the benefits of the above 
truly liberal offers, must not keep the names of sub- 
seribers together with the subscriptions, until they 
have completed their list, but should send them as 
soon as received and we will keep an exact account 
of them. 
A COMMISSION of 30 perent. in CASH will be 
paid in lieu of the above premiums for all club sub- 
scriptions at the full rate of 50 cents per annum. 
