[cmoirs of tbe Museum of Comparatibc ^oo(og» 



AT HARVARD COLLEGE. 



Vol. XVII. No. 3. 



REPORTS ON AN EXPLORATION OFF THE WEST COASTS OF MEXICO, 

 CENTRAL AND SOUTH AMERICA, AND OFF THE GALAPAGOS ISLANDS, 

 IN CHARGE OF ALEXANDER AGASSIZ, BY THE U. S. FISH COMMISSION 

 STEAMER " ALBATROSS," DURING 1891, LIEUT. COMMANDER Z. L. 

 TANNER, U. S. N., COMMANDING. 



XII. 



THE HOLOTHURIOIDEA. 



BY 



HUBERT LUDWIG. 



"WITH NINETEEN PLATES. 



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

 of Fisli and Fislieries ] 



CAMBRIDGE, U.S.A.: 



irtntcti for tljc fHuscum, 



October, 1894. 



