NO. 3652 ISOPODA AND TANAIDACEA—MILLER 19 
Baltic Sea; Bohusland, Sweden (W. Sachs); Runmar6, Stockholms skargérd 
(J. Lindahl); on Scandinavian and Finland coasts; South America, at Desterro 
and Rio Janeiro, Brazil; New Zealand; Red Sea; Java. 
Hansen (1916) considers Richardson incorrect in listing this species 
from Brazil, New Zealand, the Red Sea, and Java. He contends that 
these localities were listed by Miers (1883) for J. marina and under 
that name Miers “had mixed up at least four and probably five or 
six species.” As previously mentioned, Gruner (1965) also considers 
these locality records questionable. 
Idotea balthica (=baltica=marina) subsequently has been reported 
by many authors from many localities: North Sea (Zirwas, 1910); 
Iceland and the Faroes (Hansen, 1916); Ireland (Tattersall, 1912) ; 
Great Britain (Naylor, 1955); the Netherlands (Koumans, 1928; 
Holthuis, 1949, 1956); Alexandria, Egypt (Larwood, 1940); Australia 
(Hale, 1924), New Zealand (Hurley, 1961); New Guinea (Nierstrasz 
and Schuurmans Stekhoven, 1941). 
Gruner (1965) summarizes localities mentioned by previous authors 
and recognizes several subspecies: IJdotea balthica balthica Dahl 
(Baltic Sea), I. 6. tricuspidata Dahl (North Sea), J. 6. bastert Audouin 
(Mediterranean), and J. b. stagnea Tinturier-Hamelin (Mediterranean, 
on the coast of Roussillon). 
Richardson (1905b) gives depths for J. baltica from the surface 
to 119 fathoms (220 meters) and states it has been found on floating 
seaweed, among algae and eelgrass, in sand and gravel, and from the 
stomachs of smelt. Zirwas (1910) found it on floating wood or algae. 
Hansen (1916) states depth records are misleading as ‘‘the animals, 
which can swim rather well and frequently live among floating algae, 
have been taken in the instrument when it was hauled up.” Gruner 
(1965) states that this species is euryhaline, sometimes found in water 
with salt concentrations as low as 3.5 °/oo. It is sublittoral, usually 
does not go deeper than 20 meters, but has been found at depths of 
340 meters. In the present study, this species was found on five 
buoys, all in the New England region, always within a meter of the 
surface. 
Idotea metallica Bose 
FIGURE 3 
Locauitirs.—New York area (Stations 28-31). 
Remarxs.—lIdotea metallica, a widely distributed, nearly cosmo- 
politan species, has been reported from many localities including the 
Atlantic coast from Florida Keys to Nova Scotia, Greenland, Iceland, 
Britain, Ireland, Mediterranean Sea, Indian Ocean, northwestern 
Australia, New South Wales, New Zealand, Sumatra, Borneo, Sea of 
Japan, Cape of Good Hope, Antarctic, Montevideo, Straits of Ma- 
gellan, Chile, and Patagonia (Richardson, 1905b, 1909; Gurjanova, 
