joo CRUSTACEA MALACOSTRACA. III. 



131. Idothea pelagica Leach. 



181 5. Id v tea pelagica Leach, Transact. Linn. Soc. Lond. XI, p. 365. 

 ! 1895. — — Dollfns, 1. c. p. 8, fig. 23. 



! 1897. Idothea — G. O. Sars, Account, II, p. 81 ; PI. 33. 



Occurrence. Not found by the "Ingolf". But it has been taken twice at the Faeroes, 

 viz. in Kroyer's time, and by Cand. mag. H. Jonsson in 1897 at Thorshavn, on Laminaria hyperborean 

 furthermore a specimen was captured by Commodore Caroc, 1—4 miles west of Snefjeldsjokel, West Iceland. 



Distribution. This clumsy species seems to be somewhat scarce. It has been taken at Lille- 

 sand, south coast of Norway, close to the shore among algae (G. O. Sars), and at Christianssund on the 

 west coast (Rathke). Furthermore it has been recorded from Aberdeen (T. Scott), St. Andrews (Collinge), 

 West and South-West Ireland (Tattersall, Norman), some places on the north and west coasts of 

 France (Dollfus). 



132. Idothea metallica Bosc. 



1802. Idothea metallica Bosc, Hist. Nat. Crust. Vol. II, p. 179; PI. 15, fig. 6. 

 ! 1846. — robusta Kroyer, Naturh. Tidsskr., Ny Rsekke, Vol. II, p. 108. 



? — Kroyer, in Gaimard Voy. en Scand., Crust. PI. 26, figs. 3 a— 3 r. 



1883. Idotea metallica Miers, Journ. Linn. Soc. Lond., Zool., Vol. 16, p. 35. 



! 1895. Idothea — H. J. Hansen, Ergebn. der Plankton-Exped., Vol. II, G, c. p. 10; PI. I, fig. 3. 



Occurrence. This purely oceanic species has not been taken by the "Ingolf. But many 

 years ago some specimens were captured in Davis Strait in Lat. 64°46' N., Long. 53°35' W. (H. J. Han- 

 sen). Kroyer's specimens of his I robusta, which have not beeu preserved, had been taken between 

 Iceland and Greenland at about Lat, 6o° N. 



Distribution. Recently Dr. Collinge indirectly suggested that he has from Scotland a species 

 allied to /. metallica. It may be possible that several among the specimens referred by some authors 

 to I. metallica, or to "forms later considered as synonyms, in reality belong to a hitherto unrecognized 

 species, but as my northern specimens belong to the form figured by me as I metallica in the paper 

 quoted, I did not wish to investigate here the question and the enormous literature, especially as many 

 points cannot be decided without the examination of specimens preserved in some large foreign 

 Museums. /. metallica seems frequently, or perhaps generally, to attach itself to objects floating in the 

 sea, as Fucus, Sargasso, objects with colonies of barnacles, etc. It is distributed in the whole Atlantic 

 excepting the colder northern and southern areas, and the specimens recorded above from the "Ingolf 

 area were certainly occasional visitors brought so far northwards on floating objects. Furthermore the 

 species occurs in the Indian Ocean, and in the tropical and warmer temperate parts of the Pacific. 



Synidothea Harger. 



Only a single species is hitherto known from our area. 



