No. 1. — Reports on the Results of Dredging, under the Supervision 

 of Alexander Agassiz, on the East Coast of the United States, 

 during the Summer of 1880, hy the U. S. Coast Survey Steamer 

 "Blake" Commander J. E. Bartlett, U. S. N., Commanding. 



(Published by permission of Carlile P. Patterson and J. E. Hilgard, Supts. 

 U. S. Coast and Geodetic Survey.) 



:xviL 



Report on the Crustacea. Part I. Decapoda, By Sidney I. Smith. 



The part of the following report relating to the Maci'ura was ready 

 for the printer before Alphonse Milne-Edwards's Description de qiielques 

 Crustaces Macroures provenant des grandes profondeurs de la Mer des 

 Antilles (Annales Sci. Nat., Zool., 6"" s^rie, XL No. 4, 1881) was received, 

 so that all the references to it have been added subsequently. The new 

 species in this and some other recent papers of Milne- Edwards, and in 

 Bates's recent paper on the Penieidea, are so imperfectly characterized 

 that in several cases I have found it impossible to determine, with any 

 approximation to certainty, whether or not they are identical with 

 species described in the following pages. I have endeavored, however, 

 to make the descriptions and figures of the species here described so 

 complete, that subsequent investigators will not labor under a similar 

 difficulty in regard to them. 



BRACHYURA. 



MAIOIDEA. 



Amathia Agassizii, sp. nov. 



Plate II. Figs. 2, 3. 



Eesembles A. Carpenteri Norman (figured by Wyville Thomson, Depths 

 of the Sea, p. 175, 1873), but has shorter rostral horns and more numerous 

 spines upon the carapax. 



The carapax i.= sub-triangular, excluding spines and rostral homs, nearly 



VOL. X. — NO. 1. 1 



