The Conchologists’ Exchange. 
COPYRIGHT SECURED. 
CHESTNUT HILL, PHILADELPHIA, PA., OCTOBER, 1886. 
No. 4 
. 
A PUBLICATION DESIGNED FOR CONCHOLO- 
GISTS AND THEIR INTERESTS. 
WM. D. AVERELE, 
EDITOR AND PUBLISHER. 
Printed by Jonn C. Crark & Sons, Stationers and 
Printers, 228 and 230 Dock Street, 
Philadelphia, Pa. 
Correspondence upon Conchology, as well as relia- 
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habits, localities, etc., kindly solicited from all. 
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EDITORIAL 
One of the finest collecting grounds for the 
Conchologist to visit is the Panamic Province 
which comprises the western coast of America 
from the Gulf of California to Payta in Peru. 
While many regions more remote base their 
claims to distinction upon the greater rarity 
of their specimens, the fact remains that no 
Province within comparatively easy reach of 
American collectors possesses so many varie- 
ties of mollusks noted for their beauty of form 
and color as well as for the great numbers in 
which they are found. The Ocean and Gulf 
teem with molluscan life, and as if this were not 
enough the trees bordering the mouths of the 
rivers have among them numerous species of 
Arca, Cyrena, Purpura, Auricula, and others, 
while Littorinz climb the trees and are found 
upon their leaves. The total number of sea 
shells found in this Province is upward of 
1,500. Included in this large number are 27 
Chitonide, 13 Acmzidze, 18 Fissurellidae, 64 
Trochoide, 28 Calyptrzidee, 69 Pyramid- 
ellidee, §9 Buccinidee, and 90 Muricidz. Too 
much praise can not be given to Mr. P. P. 
Carpenter for his faithful labors in behalf of 
Conchology in this highly favored Province, 
and a marked evidence of the value of his dis- 
coveries may be found in the growing scarcity 
of his works. 
The Messrs. S. O. and H. N. Ridley of the 
South Kensington Museum, London, in a 
cruise along the Norwegian coast noticed but 
few marine mollusks besides great quantities 
of Littorine until Hammerfest was reached, 
when many varieties of bright colored shells 
were found. ‘This they found was due to the 
slight rise of the tide (3 feet) in the southern 
part of Norway, the Skagerrack coast and the 
west coast to the south of Bergen. The voy- 
age which lasted eight days extended from 
Trondhjem to the North Cape and gave the 
Messrs Ridley much information about the 
Norwegian tides as well as the marine fauna 
of the coast. At Hammerfest the tide rose 
to the. height of ten feet, which was ascer- 
tained to be the average rise and fall. 
Very few American cities of its size take as 
much interest in Natural History and express 
the same in the public manner that Milwaukee, 
Wisconsin does. There a Public Museum 
has been erected in connection with the Ex- 
position Building; and is maintained by a tax 
levied upon the citizens who are justly proud 
of their fine building and enjoy its manifold 
