THE - CONCHOEOGISTS’ - 
EXCHANGE 11 
Our August number will contain two valua- 
ble contributions from Mr. C. F. Ancey, and 
one very instructive article from the pen of 
Dr. Wm. H. Rush, of Philadelphia, describ- 
ing his dredging operations upon the Atlantic 
and Gulf Coasts. 
STRIA. 
Dr. Edward Schnitzer, otherwise known as 
Emin Pasha, who is now in the interior of 
Africa, is an enthusiastic lover of Natural His- 
tory and much is expected of him should the 
Stanley expedition for his relief result favora- 
bly. While at the University of Breslau, he 
became the intimate friend of Dr. R. Long, 
and of the late Rudolph von Uechritz, whose 
death we announced in a former issue. His 
intimacy with these savants led him to be- 
come an explorer and accounts for his present 
journey to Central Africa. 
NECROLOGY 
Dr.Didrik Ferdinand Didrichsen died March 
Igth, in his 72nd year. 
The death at Calcutta, is reported of Abbe 
Ben. Scortechim, a young Italian mycologist 
and explorer. 
Mrs. Lucy W. Say, widow, of the eminent 
naturalist, died Nov. 15, 1887,at the advanced 
age of eighty-six years. 
Mr. John Gibson,of the Natural History De- 
partment of the Edinburgh Museum of Science 
and Art, is deceased. He was the author of 
“Science Gleanings”’ and other works. 
Dr. Ezra Michener, of New Garden Town- 
ship, died June 24th, 1887, in his 93d year. 
He studied medicine in his youth,Dr. David J. 
Davis being his preceptor and in 1818 gradua- 
ted from the University of Pennsylvania. Dur- 
ing his long practice of sixty years he found 
time to study Natural History and made exten- 
sive collections in Zoology, most of which he 
gave to Swarthmore College, but we regret to 
say they were entirely destroyed in the late fire. 
With Dr. Wm. D. Hartman as a companion 
he prepared the Natural History Department 
of Judge Futhey’s History of Chester County. 
He aided the late Dr. William Darlington in 
the compilation of “ Flora Czestrica,” published 
in 1853; while every conchologist should know 
of ‘ Conchologia Czstrica,” edited conjointly 
by him and Dr. Hartman. He had a world: 
wide reputation and was spoken of in the high- 
est terms by Professor Agassiz, the elder. Dr. 
Michener was a member of The Academy of 
Natural Sciences, of Philadelphia and of num: 
erous other scientific institutions, all of which 
will miss a friend and earnest worker. 
Gxchange Column. 
Terms to NON-SUBSCRIBERS, which must be 
cash with order, are as follows: Exchanges of 20 
words, including address, ro cents ; for each additional 
10 words the charge will be 5 cents. No exchange will 
be inserted for less than 1o cents. 
Each subscriber to Volume II, will have the privilege 
of inserting three (3) /ree exchanges of twenty-five (25) 
words each, including address. This rule is made to 
include those who have already subscribed in good 
faith at the old rate, 35 cents, or those who have 
received ‘‘New.Subscription’”’ blanks and are engaged 
n soliciting subscriptions at the former price. 
A large fresh lot of Uniones, nasutus, complanatus 
and luteolus: also, a few Melantho decisa, all in excel- 
lent condition, to exchange for other fresh-water shells 
of the South and West. JOHN WALTON, 77 Arcade, 
Rochester, N. Y. 
WANTED—In perfect condition, with localities :— 
CYPREA aurantium, nivosa, exusta, Scotti, thersites, 
tessellata, physis, eglantina, fusco-dentata and umbili- 
cata. MUREX, Sauliz, palma-rosz and tenuispina. 
OLIVA, angulata, maura, Melchersi, porphyria, tene- 
brosa, tremulina. STROMBUS guttatus, latissimus and 
melanostomus. VOLUTA, fulgetra, junonia, imperialis, 
magnifica, reticulata, Rossiniana and rare Asiatic, Aus- 
tralian, African and South American Bulimi, Helicide 
and Unionide. 
OFFERED.—>s0 species of Tertiary and other Fossils 
from Southern States and Europe, Woodward’s Manual 
of the Mollusca 75 edition: Leidy’s Memoir of the Ex- 
tinct Sloth Tribe, N. A.; Lea’s Syn. of Family of Nai- 
ades, ’52 edtn: Hays’ Descrip. Inf. Max’y Bones of 
Mastodon’s, 1o plates: Agassiz & Gould’s Cain: Phy- 
siology: Bohn’s edt’n: Coultas, Prin. Botany, Cryp- 
togamia: lLea’s on a Fossil Saurian of the New ed 
Sandstone Formt’n; Lesquereux’s Cretacceus Flora,s5o 
plates, Smith’n Mis. Col. Vol. 4, Neuroptera, Vol. 6 
Diptera and Coleoptera, 3 pp out, uncut, or any of the 
shells on my Price Lists which I may have in duplicate. 
Parties not having any of the shells wanted above, need 
not apply. W. D. AVERELL, Chestnut Hill, Phila. 
