352 



EEFOKT OF COMMISSIONER OF FISH AND FISHERIES. 



of Idotea. It is nearly twice the lengtli of the lamella , to which it is 

 attached, and of an elongated spatulate form tapering to an obtuse point. 

 The lamellae are provided with but few cilia, which extend less than half 

 the way from the end of the lamella to the end of the stylet. 



Length 10.5"'"^.; breadth S-S™"". Females proportionally broader j 

 length S.'""'; breadth 3""". Color in alcohol gray, often with brown- 

 ish transverse markings. 



This species seems to agree with Idotea nodidosa Kroyer, from South- 

 ern Greenland, as described and figui^ed, except that the epimeral sutures 

 are not evident above ; the lateral margins of the segments are, however, 

 somewhat thickened and prominent with rugfe, as shown in his figure, 

 and I have no doubt that it is the same as his species. It was dredged 

 off Halifax! by the Fish Commission at several localities in the summer 

 of 1877, in from 16 to 190 fathoms on sandy and rocky bottoms, with 

 red algee at one locality. A specimen was brought from George's Banks! 

 by Mr. Joseph P. Schemelia, of the schooner ' Wm. H. Raymond,' in 

 the summer of 1879, and Mr. J. F. Whiteaves has sent to the Museum 

 for examination two specimens collected by Mr. G. M. Dawson, in 111 

 fathoms, Dixon Entrance!, north of Queen Charlotte Island, British 

 Columbia. The range of the species would therefore be, as at present 

 known, from George's Banks to Greenland and the Arctic Seas, and 

 southward on the Pacific coast as far as British Columbia.. 



Specimens examined. 



Synidotea bicuspida Harger (Owen). 



Idotea limspida Owen, Crustacea of the Blossom, p. 92, pi. xxvii, fig. G, 1839. 



Streets and Kingsley, Proc. Essex Inst., vol. ix, p. 108, 1877. 

 Idotea marmorata Packard, Mem. Bost. Soc. Nat. Hist., vol. i, p. 296, pi. viii, 

 fig. 6, 1867. 



Whiteaves, Further Deep-sea Dredging in Gulf of St. Lawrence, p. 15, 1874. 

 Idotea pulchra Lockington, Proc. Cal. Acad. Sci., vol vii, p. 45, 1877. 

 Synidotea bicus;pida Harger, Proc. U. S. Nat. Mus., 1879, toI. ii, p. 160, 1879. 



This species may be most easily recognized among the known Isopoda 

 of our coast by the form of the plcon, which is nearly triangular in 

 shape, marked by a slight incision at each side near the base, and dis- 

 tinctly bicuspid at the tip. 



