124 THE NAUTILUS. 
received the book, but extracts from it will be found in this depart- 
ment of THe Nautitus from month to month. Our Chapter can- 
not afford to do without THe Nautius. 
On page 112, February number, under “ Section C” the name of 
the city (Toronto) was omitted in Mr. Lemon’s address. 
Members of our Chapter interested in West Coast mollusks, will 
find Dr. Wm. H. Dall’s bulletin on “ Diagnosis of New Species of 
Mollusks from the West Coast of America” valuable. It contains 
27 new species and 2 new genera. The shells were collected by the 
Albatross from points as far north as Tillamook, Washington, to the 
Gulf of Panama, excepting one species dredged off the Argentine 
coast. In this species Philobrya, instead of the more familiar Bryo- 
phila is used for the genus, the reason for this is given. A Nucula 
is described as being “ one of the largest known.” Two orbicular 
species of Periploma are described. Mention of this bulletin will be 
found in the August number of THE Nautivus. 
Another publication of the National Museum is Charles T. Simp- 
son’s comprehensive work upon the Naiades, entitled “The Classifi- 
cation and Geographical Distribution of the Pearly Freshwater 
Mussels.” The title will convey to our members some idea of its 
scope. The genus Margaritana is placed with the genus Unio. A 
comparison of Unio pressus and Margaritana rugosa is presented. 
The various areas of the Naiades are given, Europe, Asia, Africa, 
America and the islands of the seas, also a map showing distribution. 
The Geological age of Unios is noticed, and the bulletin contains 
many references to the books and pamphlets written on the pearly 
freshwater mussels. It is a valuable contribution to molluscan lit- 
erature. 
A TRAY OF SHELLS FROM DENMARK. 
(Extract from the report of the President, Prof. Josiah Keep. From the Transac- 
tions of the Isaac Lea Chapter for 1896. 
(In the report of the President, Professor Keep, he has given 
minute instructions in reference to an exchange of United States 
shells for European forms by an illustration. He tells the members 
of our Chapter how he sent some West Coast Mollusks to a gentle- 
man in Copenhagen, the return of his box filled with foreign shells 
