No. 4. — 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, hj the U. S. Coast Survey Steamer 

 " Blake," COMMANDER J. K. Bartlett, U. S. N., Commanding. 



(Published by permission of J. E. Hilgard, Superintendent of the U. S. Coast 



and Geodetic Survey.) 



XXIII. 



Report on the Isopoda. By Oscar Harqer. 



The collection of Isopoda from the Blake Expedition, although small 

 in number, is remarkable for the large proportion of interesting forms se- 

 cured, since nearly all the specimens prove to belong to species that are 

 either new, or not hitherto known from our coast, or to species known 

 only from single specimens and hence only imperfectly described. 



CIROLANID^. 

 Cirolana spinipes Bate & Westwood. 



Plate I. Figs. 2-3 d. Plate II. Figs. 1-lc. 



Cirolana spinipes Bate & Westwood, Brit. Sess. Crust., II., p. 299. 18G8. 



Specimens of this species, not hitherto recorded from our coast, were ob- 

 tained from two localities ; viz. Station 316, Lat. 32° 7' N., Long. 78° 37' 

 30" W., 229 fathoms, one female ; and Station 321, Lat. 32° 43' 25" N., Long. 

 77° 20' 30" W., 233 fathoms, three females and one male. 



These specimens appear to agree perfectly in all specific characters with 

 others in the collection of the Yale College Museum identified and sent to the 

 Museum by the Rev. A. M. Norman, from the Shetland Islands. They do, 

 however, differ in some respects from the description of that species in Bate 

 and Westwood's work, and to facilitate comparison with that species and with 

 others on our coast a full description is appended, with figures. 



The body is a little more than three times as long as broad, with the dorsal 

 surface strongly rounded, polished and smooth except for minute punctations, 

 mostly near the posterior margin of eacli segment, and a median dorsal row of 

 shallow oval depressions, most distinct on the third, fourth, and fifth thoracic 

 segments. 



VOL. XI. — NO. 4. 



