Memows of the Museum of Comparative Zodloqn 
AT HARVARD COLLEGE. 
Vou. VIII. No. 2. 
EXPLORATION 
OF THE 
SURFACE FAUNA OF THE GULF STREAM 
UNDER THE AUSPICES OF THE COAST SURVEY. 
By ALEXANDER AGASSIZ. 
IJ. Parr I. 
The Porpitide and Velellide. By ALEXANDER AGasstiz. 
PUBLISHED BY PERMISSION OF CARLILE P. PATTERSON AND J. E. Hincarp, 
SUPERINTENDENTS U. S. Coast AnD GEODETIC SURVEY. 
WITH TWELVE PLATES. 
CAMBRIDGE: 
Printey for the Museum. 
JULY, 1883. 
