248 



much more advanced stage, the one from the Norwegian coast, the other taken 

 from a fisher's boat at Skagen (Denmark), and kindly sent to me for examination 

 from the Museum of Copenhagen. The habitus-figure given on the accompanying 

 plate is from the latter specimen, whereas the detail-figures have been made from 

 dissections of the other specimen, which was in rather a bad state of preserva- 

 tion, though it admitted of an exact examination of all the appendages. This spe- 

 cimen was taken off the south coast of Norway (the exact locality not being 

 stated), and measured 24 mm. in length. It was accordingly of about the same size 

 as that described by Dr. Bovallius under the name of Rocinela Littjeborgii, and 

 agreed with it in all respects. The Danish specimen was considerably larger, 

 measuring in length 29 mm., and had the anal segment somewhat broader in 

 proportion to its length, though otherwise it agreed very closely with the Norwegian 

 specimen. In both, the 7th pair of legs were well developed, and of exactly the 

 same structure as the preceding pair, though not quite so long, at least in the 

 Norwegian specimen. In fully grown individuals this pair are, in all probability, 

 the longest of all. I can see no essential differences between the European and 

 American forms, and am still of opinion that they belong to the very same 

 species. The only difference is that the legs, according to the detail-figures given 

 by 0. Harger, are somewhat more spiny in the American form than in the Nor- 

 wegian form; but the number of spines in all probability increases with age, and 

 some of the American specimens are of very considerable size, reaching to no 

 less than 44 mm. in length. The slight difference in the relative length of the 

 anterior and posterior divisions of the body, found on comparing the habitus- 

 figure given by 0. Harger with that of the accompanying plate, may arise from 

 the different sex of the 2 specimens, the one here figured being a female, whereas 

 that figured by 0. Harger is a male. As to the form of the anal segment, it 

 may also vary to some extent; it was, indeed, in the Norwegian specimen, more 

 like that of the American form than it is in the Danish specimen. 



Page 70. Cirolana borealis. 

 Distribution. — The Barents Sea (Hoek). 



Page 81. Idothea pelagiea. 



Occurrence. — Some well-marked specimens of this form were sent to me for 

 examination by Mr. Schneider, who took them at Vadso. It has also been collected 

 in the Trondhjem Fjord by Curator Storm, and I found it myself last summer 

 at Christiansand. In all 3 cases it occurred close to the shore among algae. 



