Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. XXIV. No. 4. 



REPORTS ON THE DREDGING OPERATIONS OFF THE WEST COAST OF 

 CENTRAL AMERICA TO THE GALAPAGOS, TO THE WEST COAST 

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

 ALEXANDER AGASSIZ, CARRIED ON BY THE U. S. FISH COMMIS- 

 SION STEAMER "ALBATROSS," DURING 1891, LIEUT. COMMANDER 

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



IV. 



VORLAUFIGER BERICHT UBER DIE ERBEUTETEN HOLOTHURIEN. 



Von Hobert Ludwig. 



[Published by Permission of Marshall McDonald, U. S. Fish CommisBioner.] 



CAMBRIDGE, U.S.A. : 



PRINTED FOR THE MUSEUM. 



June, 1893. 



