Bulletin of the Museum of Comparative Zoölogy 
AT HARVARD COLLEGE. 
Vor. XXXII. No. 10. 
REPORTS ON THE RESULTS OF DREDGING, UNDER THE SUPERVISION 
OF ALEXANDER AGASSIZ, IN THE GULF OF MEXICO AND THE 
CARIBBEAN SEA, AND ON THE EAST COAST OF THE UNITED 
STATES, 1877 TO 1880, BY THE U. S. COAST SURVEY STEAMER 
“BLAKE,” LIEUT.-COMMANDER C. D. SIGSBEE, U. S.N., AND COM- 
MANDER J. R. BARTLETT, U. S.N., COMMANDING. 
[Published by Permission of CARLILE P, PATTERSON and HENRY $, PRITCHETT, Superin- 
tendents U, S. Coast and Geodetic Survey,] 
XXXVIII. 
ÉTUDE MONOGRAPHIQUE 
DES 
PLEUROTOMAIRES ACTUELS. 
Par E. L. Bouvier er H. FISCHER. 
AVEC QUATRE PLANCHES. 
CAMBRIDGE, MASS., U.S. A. : 
PRINTED FOR THE MUSEUM. 
Serr. 1899. 
