Ufamoirs of the Museum of (Komparatibn foologn 



AT H \ i; \ \ i;d COLLEG E 

 Vol. XVII. No. 3. 



REPORTS ON AN EXPLORATION OFF THE WEST COASTS OK MEXICO, 

 CENTRAL AND SOUTH AMERICA, AND Ol-'F THE GALAPAGOS ISLANDS, 

 IN CHARGE OF ALEXANDER AGASSIZ, l'.Y THE I . S. FISH COMMISSION 

 STEAMER "ALBATROSS," DURING 1891, LIEUT. COMMANDER /-. L. 

 TANNER, U. S. N., COMMANDING. 



XII. 



THE IIOLOTHURIOIDEA. 



BY 



HUBERT LUDWIG. 



WITH NINETEEN PLATES. 



[Published by Permission of Marshall McDoxald, U. S. Commissioner 

 of Fish and Fisheries ] 



CAMBRIDGE. U. S. A. : 

 ^rintrrj for tfje ffluscum. 



October. 1894. 



