84 
THE - CONCHOLOGISTS’ : EXCHANGE. 
it and easily washed out. With a large sail- 
boat it is also an advantage to have a whip 
leading down from the mast to lift the dredge 
from the water, anda second whip or line lead- 
ing through a block at the top of the mast, and 
hooked into an eye made of rope in the bottom 
of the sack, is very convenient in dumping, as 
the dredge can be raised to its place with the 
whip, then the line hooked into the bottom, 
when it is easily lifted: up until the contents 
will run out. One will find in dredging all 
day by hand alone that it is heavy, fatiguing, 
wet work, For small sail or row-boats the 
dredge should be smaller, from 18 to 20 inch 
blades will be found heavy enough. I hope 
that the coming season, many who have never 
tried dredging before, may be induced to do so, 
and the result will be the obtaining of many 
rare species and specimens and in better condi- 
tion than usually found along the shores of 
rivers or the sea beach, 
Ogallala, Neb., Dec. 5th, 1887. 
Notes on Teredo. 
BY W. W. WESTGATE. 
I see in “ Shell-bearing Mollusca” Mr. Carpen- 
ter says that he has never seen a specimen of 
any species (Teredo) in Rhode Island, ‘That 
is strange, because there are several species of 
Teredo found from Massachusetts Bay south- 
ward: eredo navalis, Linn, found from Cape 
Cod to Florida; VYeredo megotara, Hanley, 
Massachusetts Bay to South Carolina; Teredo, 
dilatata, Stimp., same as the last; Teredo 
Thompsoni, Tryon, around Cape Cod; besides 
Xylophaga dorsalis, Forbes and Hanley, and 
Xylotrya fimbriata, Jeffreys, have an extended 
range, and might occur there. I make the fol- 
lowing extracts from Fisheries and Fishery In- 
dustries of the U. S.: “This species (T, nav- 
alis) is very abundant along the southern coast 
of New England, from New York to Cape 
Cod, wherever submerged wood-work, sunken 
wrecks, timber buoys, or floating pieces of drift | 
wood occur,” ‘At Provincetown, Cape Cod, 
about forty feet of the end of the steamboat 
wharf was so weakened by its borings that it 
completely gave way under a load of merchan- 
dise stored upon it.” ‘ Capt. B. J. Edwards 
told me that formerly, when the cedar or chan- 
nel buoys in Buzzards Bay, Mass., were not 
| Ark. 
| Thesaurus, Monograph Veneride. 
taken up, they would not last more than two 
years, owing chiefly to the attacks of this Tere- 
do.” ‘Teredo megotara has been found in 
floating pine wood at Newport, R. I., and in 
cedar buoys at New Bedford, Mass.” I could 
give more instances, but I think this is enough 
to show that Mr. Carpenter can add a few more 
species of shells to his already fine list. 
'  Ferychaunges. 
Offered.—Land and fresh-water shells from this 
locality for other shells. Have about 300 of Unio 
cylindricus, Say; tuberculatus, Barnes; gibbosus, 
Barnes; rectus, Lam.; alatus, Say; verrucosus, 
Barnes ; pressus, Lea ; zig-zag, Lea; elegans, Lea ; 
gracilis, Barnes; metanevrus, Raf.; soleniformis, 
Lea; complanatus, Barnes ; cornutus, Barnes. 
JAMES H. FERRISS, Joliet, Ill. 
Will exchange minerals for other minerals, Pacific 
shells or fossils. J. C. PARKER, Kennebunk, 
Maine. 
Curios, stamps and books to exchange. Wanted.— 
No.1, Vol. 1 CoNcHOLOGISTS’ EXCHANGE. E J. STEB- 
BINS, 11 E. Maumee St., Mich. 
Offered.—Sea shells for pyrites of iron from Colo- 
rado gold mines. S. FERGUSON, Eureka Springs, 
Offered.—Land and fresh-water shells for same 
EDW. D, KEITH, Moore St., Providence, R. I. 
Offered.—Botanical specimens for shells if in good 
condition. Nodead shells wanted. T. G. BRINTON, 
755 Corinthian Ave , Philadelphia, Pa. 
Offered.—Fine, large foreign sea shells for South- 
ern iand and fresh-water shells. List sent on appli- 
cation. Also, good general curiosities in exchange 
for land shells. THOS. E. ADDY, 54 N. Franklin 
St., Janesville, Wis. 
Wanted.—North American Land Shells and Ter- 
tiary Fossils for recent Shells. D. W. FERGUSON, 
138 Wilson St., Brooklyn, (E. D.) N. Y. 
Wanted.—Correspondents interested in the study 
of the Mollusca of Colorado, Wyoming, Utah, Ari- 
zona, New Mexico, Kansas, Indian Territory and 
Nebraska. THEO. D. A. COCKERELL, West Cliff, 
Col. 
Offered.cKnorr: Horens en Schelpen; Sowerby: 
Wanted.— Vol- 
umes of American Journal of Conchology, or other 
conchological books. M. M. SCHEPMAN, Rhoon, 
near Rotterdam. Holland. 
Fioe specimens of the fossil Leda truncata from 
the clays of the Champlain Period in Maine, for 
offers. CHAS. A. DAVIS, Prof. Nat. Science, Alma, 
Mich, 
