THE CONCHOLOGISTS’ EXCH ANGE. 
to 
Ww 
| 
BOOK EXCHANGE. 
TO ALL SCIENTISTS AT’ THE SAME RATE AS 
** EXCHANGES IN MOLLUSCA. 
OPEN 
OFFERED :—Woodward’s Manual of the Mollusca 
75 Edition; Leidy’s Memoir of the Extinct Sloth 
tobe, N. A.; Lea’s Syn. of Family of Naiades, ’52 
edtn; Hayes’ Descrip. Inf. Max’y Bones of Masto- 
dons, 10 plates ; Agassiz & Gould’s Comp. Physi- 
ology, Bohn’s edt’n; Coultas, Prin’ Botany, Crypto- 
gamia: Lea’s on a Fossil Saurian of the New Red 
Sandstone Formt’n; Leidy’s Geol. sketch of Fst. & 
Fr. Water deposit of Judith R. &c. &c., pres’t copy : 
Meigs’ Obs. Rep. Organs of Dolphin; Lesquereux’s 
Cretaceous Flora, 50 plates, Smith’n Mis. Col. Vol. 4, | 
Neuroptera, Vol. 6 Diptera and Coleoptera, 3 pp. out. 
WANTED: First 3 vol. Lea’s Obs. Genus. Unio; 
Say’s American Conchology; Goulds Invertebrata of 
Mass.; Kiener’s plates of Shells ; ; Carpenter’s works ; 
Tryon’ s Monog. Terr. Moll. of U. S.; Sowerby’s 
Conch. Manual and Pilates: for offers in works on 
Conchology. W.D. AVERELL, 
Chestnut Hill, Phila. 
IMPORTANT! ! 
By devoting part of your leisure time to 
forming ‘*Clubs’’ of subscribers to ‘The 
4 7 
Conchologists’ Exchange,”’ you can secure for 
yourself the following advantages :— 
OFFER No. 1.—g0 cents in cash and the 
names of five subscribers, will secure to you a 
free subscription to the ‘Exchange,’ and 
shells to the value of 50 cents from a SPECIAL 
LIST OF MOLLUSCA which will be sent 
on application. 
OFFER No. 2. ia Gan in eae and names 
of ten subscribers, will secure you a free sub- 
scription and $1.00 worth of shells. 
OFFER No. 3.—$3 in cash and twenty 
names will secure you a free subscription and 
$2 00 worth of shells. These shells will be 
post-paid in all cases. 
We propose to hold these “offers” open 
until January 15th, 1887, and we hope they 
will have the effect intended, i. e. a renewed 
interest in the study of Conchelogy: 
Alphabetical List of Shells received since the issue of Ence 
List of Moises Ne, 3. 
by purchasers in all cases. 
sold under same conditions. 
Terms:—Cash with order. 
Express charges to be borne 
Note:—A discount of 10 per cent. payable in shells at List 
prices, will be allowed on all orders of $5 and upwards accom- 
panied with the “cash. i 
Mollusca, No. 2,’ 
This discount applies to “Price List of 
’ and all subsequent Lists until further notice. 
UNIVALVES Melania Triton 
Rittiam amatula, Lam\..c00./ 1/44. aa mubeGulay same 4... s..0c.0.2006 15 to 30 
PU OSU ye soc venus oaesaseocte ovens ~-< 5, 10 Monoceres BIVALVES 
Cerithium Wp lapilloides;sComtesecare-ener te 10, 15 Machera 
Cibmmum, Shy... ...s.s.soeceoses-0- 105 15) | Neritina Patilay DION. teececseescecetcesss 20, 25 
Olina Dyes tes tece anes enee snes 15 {naar gs rahe Macoma 
Cerithidea Gece eater arogn verses aot acaues Osi Dill CONS DICHA OD Veco eseesec essere 10, 15 
petits re Neritopsis nasuta, Con..... Sasecse ero 2O 
2 GGA ot Paid saul £Ts esd. bt Ne Peek, roitoj2o) guquinata, Desh.......2...----200 15, 20 
Tito: Sd aa | Paludina |, Mytilus 
neritoidea , (CHEM id 55... seep ences PSeON aie yas biede Mise ol eS poles Californianus, Gone cots. cccane 20, 40 
Drillia | Pisahia SN WMA atts) SAY..«ocs-ne- pence =sleeee=s IO, 15 
IBaxclayensis mA . (Ad) 22,222.22. 10, 15 | eee aoe SUS Aye Rap tk eS S3te 
Ralina I) UMGOSUMS IG. seecescctsesd occa ee nee 20 to 35 | bifurcatus, Rve.................000 15, 20 
: Pleurotoma Tapes 
Eorbuosa’, Woalm st ce ds2..ehets2. <2 15, 20) Staimiineas | COM. ccecscecneresse=-bar 20,25 
. | cincta, Lam 0 , 
Lunatia | abbreviata, Lam nee Tellina 
Mewisitt. Gldtis a vctewtites $2. 25, 35 Clavius javier tetstaenscedessee daca: 10 Bodegensis, Hidsis:s..2..00.d. 4.00 20, 30 
