Pah ALOR. Nae: 
The publication of the Seventh Number of the Memoirs assigned to the 
Fourth Volume of the series has been selected by the Editor as making a suitable 
point at which to close the volume. While the number of pages of letter-press is 
less than in some preceding volumes, the number of plates is twice as great as in 
any of them, and to hold the volume open for further additions would result in 
making the book too bulky and inconvenient to handle. 
Volume III of the Memoirs has not at this date been brought to a conclusion. 
The Monograph upon the Osteology of the Chalicotheriide, long in process of pre- 
paration by the Editor, has not yet been entirely completed, but it is confidently 
expected that before the end of the present calendar year it will have been issued 
from the press. 
Volume V of the Memoirs will open with a monographic paper upon the fresh- 
water fishes of British Guiana from the pen of Dean C. H. Eigenmann. It is 
possible that this monograph with the accompanying plates and maps may be 
found to supply material enough in itself to constitute Volume V, which, in that 
event, will consist of a single number. 
Volume VI of the Memoirs will open with a paper upon the Fossil Fishes from 
the Jurassic of Solenhofen now in preparation by Dr. Charles R. Eastman. 
April 15, 1911. W. J. Houuanp. 
lil 
aC 
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