Bulletin of the Museum of Comparative Zoölogy 



AT HARVARD COLLEGE. 



Vol. XXV. No. 10. 



REPORTS ON TUE DKEDGING OPERATIONS OFF THE WEST COAST OF 

 CENTRAL AMEIMCA TO IHE GALAPAGOS, TO THE WEST COAST 



OF MEXICO, AND IN THE GULF OF CALIFORNIA, IN CHARGE OF * 



ALEXANDER AGASSIZ, CAKKIEI) ON BY THE U. 8. FISH COMAJIS- "1 



SION STEAMER "ALBATROSS," DUKING 1891, LIEUT. COMMANDER f 



Z. L. TANNER, U. S. N., COMMANDING. ; 



XIII. 

 DIE OPISTHOBRANCHIEN. 



Von Rudolph Bergh. 



SectioTjnl Tihrrrrv 



[Published by Permisaiou of Marshall McDonald, U. S. Fish Comraissioner.] 



"N 



WiTTI TWELVE PlATES. 



CAMBRIDGE, :MASS., U. S. A. : 

 PRINTED FOU TUE MUSEUM. 



OCTOBER, 1894. 



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