iv CONTENTS. 



Nci. 11 — List of the Crinoids obtained on the Coasts of Florida and Cuba, 

 by the United States Coast Survey Gulf Stream Expeditions, in 1SG7, 

 1868,1869. By L. F. de Pocrtales, Assist. U. S. Coast Survey . . 355 



No. 12. — List of Holothuridse from the Deep-Sea Dredgings of the United 

 States Coast Survey. By L. F. in; Lourtales, Assist. U. S. Coast 

 Survey 359 



No. L3. — Report upon Deep-Sea Dredgings in the Gulf Stream, during 

 the Third Cruise of the U. S. Steamer Bibb, addressed to Pkofesso 

 Benjamin Peirce, Superintendent U. S. Coast Survey, by Louis 

 Agassiz 363 



