INTRODUCTION. 



The purpose of this report is three-fold; first, to describe 

 and figure as far as possible all the Arthrostraca which have 

 been collected within the limits of the State of Connecticut; 

 second,_to describe briefly those forms which have been reported 

 from neighboring States only, but whose habitat probably ex- 

 tends to this region ; and third, to furnish to the general student 

 an account of the anatomy and biology of the group as repre- 

 sented by species of this State. The Amphipoda will be treated 

 more fully than the Isopoda because the latter group has already 

 been discussed, in the excellent account of the Rev. T. R. R. 

 Stebbing in his History of Crustacea (D. Appleton & Co., 1893) 

 pp. 314-435 ; in the briefer paper by Miss Richardson in the Pro- 

 ceedings of the United States National Museum, vol. 27, pp. 1-31, 

 1905 ; and in Harger's valuable paper on the Marine IsOpoda of 

 New England in the Report of the United States Commissioner 

 of Fisheries for 1878, pp. 297-462. 



Among the works that ha^ve been consulted and have proven 

 of greatest value in the preparation of this report, may be men- 

 tioned Delia Valle's monograph on the Gammarini (Fauna und 

 Flora des Golfes von Neapel, vol. 20, pp. 1-296, 1893) and 

 Mayer's work on the Caprellidea (Ibid., vol. 6, pp. 84-184, 1882, 

 and vol. 17, pp. 94-144, 1890.) These volumes contain very full 

 accounts of the anatomy and biology of the groups as a whole. 

 For the description of species, attention should be called to 

 Stebbing's Gammaridea (Das Tierreich, Lief. 21, pp. 1-806, 

 1906), which gives descriptions and determinative keys with 

 full synonomy for all the Gammaridea described up to 1898, 

 and to G. O. Sars's Crustacea of Norway (vol. I, pp. 1-711, 

 1890-1894), in which the descriptions are particularly accurate 

 and the figures reliable. Without the help afforded by these 

 figures the labor of preparing the ones for this report would have 

 been vastly increased. The various publications of Holmes on 

 the North American Amphipoda have also been freely re- 



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