350 REPORT OF COMMISSIONER OF FISH AND FISHERIES 



Isles of Shoals! , by Capt. G. H. Martin, of the schooner l Northern Eagle/ 

 in 1878, and at Halifax!, Nova Scotia, by the U. S. Fish Commission in 

 1877, whence it extends to at least 60 north latitude. 



The figure and description of Idotea metallica given by Bosc corre- 

 spond well with small specimens of this species such as were taken by 

 Professor S. I. Smith and the writer on George's Banks, and the locality 

 he gives, "the high seas," corresponds also with the habit of this species, 

 so that I am. inclined to think that his name ought to be restored. I 

 have, however, retained Kroyer's name, since he so thoroughly described 

 and so well figured the species as to leave no doubt of its identity. 



Specimens examined. 



Synidotea Harger. 

 Synidotea Harger, Am. Jour. Sci., Ill, vol. xv, p. 374,1878. 



Antennae with an articulated flagellum ; epimeral sutures not evident 

 above; pleon apparently composed of two segments, united above but 

 separated at the sides by short incisions ; operculum with a single api- 

 cal plate; palpus of maxillipeds three-jointed. 



Of the two species that I had referred to this genus I had been able to 

 examine only the first when this paper was placed in the hands of the 

 printer. Two specimens of the second species were collected during the 

 summer of 1879, and an examination of their characters leaves no doubt 

 of their generic affinity. Except in the particulars above specified the 

 description already given of the genus Idotea will in general apply also 

 to the present, but the species are characterized by a firmer and more 

 solid structure, the segments being more closely articulated and the integ- 

 ument having a somewhat shelly appearance. The pleou is further con- 

 solidated than in that genus, the only trace of its composite nature, as 

 seen from above, being a slight incision on each side near the base and 

 running up somewhat oblique 1\ toward the dorsal surface. The well- 

 developed and distinctly articulated flagellum of the antennae serves 

 easily to distinguish the species 1'rom those of the following genera of the 

 family. 



