242 
BULLETIN OF THE BUREAU OF FISHERIES 
Harpacticus uniremis Krpyer 
This harpacticoid becomes planktonic only occasionally or accidentally but nor- 
mally lives on thebottom — according to Sars (1903-1911) on muddy bottom in 20 to 100 
fathoms. The localities of capture which he quotes from various earlier authorities 
include the Scottish coast, Norwegian coast, Spitzbergen, Bear Island, polar sea 
north of Grinnell Land, and Bering Sea. Williams (1907) has also recorded it from 
Narragansett Bay and from the brackish Charlestown Pond in Rhode Island, Fish 
(1925) at Woods Plole, and the Canadian Arctic expedition collected it in surface 
tows at two localities off southern Alaska (Willey, 1920). 
Doctor McMurrich, in his plankton lists, records this species occasionally at 
St. Andrews in December (one haul) ; in five hauls between March 28 and May 19; 
twice in June; not at all during the later summer or autumn; and Willey (1923) 
reports it from the stomachs of winter flounders (Pseudopleuronectes) caught there. 
In this region of violent tidal circulation it is perhaps swept up from the bottom by 
the active stirring of the water. It has not been taken in the open Gulf and is hardly 
to be expected there in the plankton. 
Heterorliabdus spinifroms (Claus) 
Dr. C. B. Wilson contributes the following note on this species, which “is easily 
recognized by the asymmetry of the caudal rami and by the excessive length of one 
of the apical setae attached to the left ramus. In the plankton taken continuously 
across the Atlantic by ITerdman this species was found sparingly between mid-ocean 
and the Canadian shore, and hence is found considerably north of the Gulf of Maine. 
During the Challenger expedition it was taken at several widely separated stations 
in the North Atlantic, and at one place in the South Atlantic from a depth of 2,650 
fathoms (Brady, 1883). Thompson and Scott (1903) have reported it in the Medi- 
terranean, in the Indian Ocean, and near Ceylon. Esterly (1905) obtained only a 
single female of this species from the plankton at San Diego on the Pacific coast, 
and incidentally one or two specimens of three other species of the genus. In the 
Gulf of Maine it was obtained in only two vertical hauls — one in the open ocean 
southeast of Georges Bank and the other outside of Boston Harbor. The first haul 
was made on March 12, 1920, and this species had a percentage of four in the catch. 
The second haul was made on May 4, 1920, and spinifrons formed only 1 per cent 
of the catch. In none of the reports here enumerated was it found in any numbers, 
and the four per cent mentioned [indicating an absolute abundance of about 3,100 
per square meter] is about its maximum anywhere.” 
In the Gulf of Maine it may be classed as an accidental visitor from warmer 
and more oceanic waters offshore. 
Idya furcata (Baird) 
Sharpe (1911, p. 417) describes this as “perhaps the commonest and most 
widely distributed of all the Harpactoida.” Probably it will eventually prove 
cosmopolitan in suitable situations, being recorded from widely separated localities 
in the Arctic Ocean, including the Alaskan shore of Bering Strait and the Arctic 
