THE - CONCHOLOGISTS’ - 
EXCHANGE 
CORRESPONDENCE. 
Editor Conchologists’ Exchange: 
Sir: In Vryon’s Manual, First Series, Vol. 
III, page 109, Mr. Tryon statesthat AZelongena | 
Susiformis, Blainy. is apparently very closely | 
related to Cuma Kiosguiformis, Ducl., but 
that the operculum according to D’Orbigny | 
is not purpuroid. He says that the resem- 
blance conchclogically is much nearer Cuma 
than either JMelongena or Siphonalia and 
that he cannot help thinking that the great 
French naturalist was mistaken as to the oper- 
culum. I recently received three specimens 
of this shell from Panama, two of which con- 
tained the dried animal and the operculum in 
position. Itis not purpuroid, but, like that of 
Melongena coronis,is solid and claw-like, with 
an apical nucleus, and might be mistaken for | 
that of the above shell only that it is smaller 
and a little heavier. Ithink this will settle 
it, that A/elongena fusiformits is a proper JZe/- 
ongena. In my specimens I can trace some of 
the characters of the genus,a somewhat pyriform 
body-whorl, tuberculate shoulder, and there are 
resemblances in the aperture. 
CHAs. T. SIMPSON, 
May 4, 1887. Ogalalla, Neb. 
- 
Exchange Column. 
Terms to NON-SUBSCRIBERS, which must be | 
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No exchange will 
Each subscriber to Volume IT,will have the privilege 
of inserting three (3) /rvee exchanges of twenty-five (25) 
words each, zzcluding address. his 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 
in soliciting subscriptions at the former price. 
WANTED :—American correspondents interested in 
the study of the genusPupa (including Pupilla, Vertigo, 
etc.), of the U.S. Duplicates and other shells for ex- 
change. V. STERKI, M. D., New Philadelphia, O. 
Mention this paper. 
Cylas dentata, Terebra dislocata, Sigaretus perspec- 
tivus, Sphzrium securis and striatinum, Zonites sup- 
pressa, Helix fallax and many others to exchange for 
Land and Fresh-water shells. A. K. FAIRCHILD, 
Whippany, N. J. 
OFFERED:—Ynsatella Americana, Petricola_ phol- 
adiformis, Angulus tener, Say; Macoma fragilis, Ad.; 
Tottenia gemma, Tot.; Modiola plicatula, Urosalpinx 
cinerea, Say; Rissoa minuta, Purpura lapillus, Nassa 
trivittata, Lunatia heros, Melampus bidentatus, Unio 
nasutus, U. complanatus, Spherium rhomboideum, 
Say; S. partumerium, Succinea Totteniana, Lea; 
S. ovalis, Gould; Littorina, Odostomia, &c., for other 
shells. EDWARD W. ROPER, Revere, Mass. 
OFFERED:—American Journal of Conchology,seven 
vols. neatly bound, in exchange for shells. 
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. 
OFFERED:— Tellina radiata, Paludina integra, 
Strombus gigas,Modiola plicatula, Mytilus edulis,Crep- 
idula unguiformis, Lzevicardium serratum, Columbella 
mercatoria, Limnza elodes, for land and fresh-water 
shells. WM. H. WEEKS, Jr., 508 Willoughby Ave., 
Brooklyn, N. Y. 
OFFERED :—Minnesota and marine shells for anes 
shells and minerals. Send lists. JOHN M. HOLZ- 
INGER, State Normal School. Winona, Minn. 
TERTIARY and other fossils from Southern States 
and Europe; 50 species of Birds’ Eggs, and roo pounds 
of Minerals consisting of Amethyst on Agate; Agate 
rough and polished: Pyromorphite: Native Copper 
Zine blende: Galena: rare Iron Ores, &c., &c., for 
strictly fine and correctly named Mollusca from South 
and Central America, Asia, Africa, and Australia. 
WANTED:—First 3 vol. Lea’s Obs. Genus; Unio. 
Say’s American Conchology: Gould’s Invertebrata of 
Mass: Kiener’s plates of Shells: Carpenter’s works: 
Tryon’s Monog. Terr, Moll. of U. S., Sowerby’s 
Conch. Manual and Plates for offers in works on Con- 
chology. 
Address,W. D. AVERELL, 
Chestnut Hill . Phila. 
OFFERS requested in exchange for many of the 
smaller mollusks of the waters south of Hatteras. 
W. H. RUSH, M.D., 1308 Green St., Philadelphia, Pa. 
Ol sysue ay 
Geological and Archeological Specimens and Scien- 
tific Books. Corals from the falls of the Ohio, a spec- 
ialty. Can furnish from a single specimen to one 
hundred thousand. Correspondence with advanced 
collectors solicited. Best of reference given and satis- 
faction guaranteed or money refunded. 
* PROF. G. K. GREENE, 
NEW ALBANY, IND 
12-3 
