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CONTENTS. 



No. 1.— 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. XXX. THE SPONGES. By H. V. 

 Wilson. 26 plates. July, 1904 1 



No. 2.— 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. XXXI. THE RADIATING ORGANS 

 OF THE DEEP SEA FISHES. BY ROBERT VON LEDENFELD. WITH AN 

 APPENDIX ON THE STRUCTURE OF THE BIRD-LIKE ORGANS OF 

 MALTHOPSIS SPINULOSA GARMAN. By Emanuel Trojan. 11 plates, 1 

 chart. August, 1905 1(35 



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. XXXVI. EIN BEITRAG ZUR 

 MORPHOLOGIE DES TIEFSEEFISCIIGEHIRNES. Vox Emanuel Thcuav. 

 6 plates. October, 1906 . % 215 



No. 4.— THE GALAPAGOS TORTOISES. By Samuel Garma.n. 42 plates. January, 



1917 257 



