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experiments on the vertical migrations of copepods, which lead to the conclusion that 
while it is at all times negatively geotropic — that is, tends to swim upward against 
gravity — the phototropism of the females, whether positive or negative, depends 
upon the intensity of the light, weak attracting and strong repelling them, whereas 
the males show a weak negative phototropism under all conditions. Thus, he 
concludes, the females may be expected to rise with the setting sun, as the light 
weakens, and to descend again after sunrise, when they become positively photo- 
tropic enough to counteract their negative geotropism. The males, he believed, 
follow the females because chemically attracted to them. What little is known of 
the vertical movements of Labidocera at liberty in the sea conforms to this schedule, 
for Parker found them at the surface from sunset to sunrise. 
This species is an important article of diet for copepod-eating fishes farther 
south, writes Dr. C. B. Wilson, but probably it is never sufficiently plentiful for this 
in the Gulf of Maine. 
Lucicutia grandis Giesbreclit 37 
This species was founded on a single male specimen obtained off the west coast 
of South America just north of the Equator. The two Gulf of Maine specimens 
are interesting because there has been no subsequent report of it except one female 
from the North Atlantic doubtfully referred to it by Wolfenden (1 904). The Gulf of 
Maine collections contain two males from a vertical haul from 1,000-0 meters off 
the southeast slope of Georges Bank, March 12, 1920 (station 20069), indentified by 
Dr. C. B. Wilson (table, p. 299). 
Metis ignea Philippi 
This small, brilliant, blood-red harpacticoid, originally described from the Medi- 
terranean, has since been redescribed as “ Uyopsyllus coriaceus” from the Irish coast 
by Brady (1883) and by Brady and Robertson (1873); Sars (1903-1911) also found it at 
several localities on the coast of Norway. M. ignea has not been reported definitely 
from American waters, but Williams’s (1907) “ Uyopsyllus natans” from Narragansett 
Bay is a very closely allied form, if not identical, as Sars (1903-1911, p. 346) suggests. 
So, also, is the “I. sarsi” described by Sharpe (1911) from Woods Hole. Brady and 
Robertson described M. ignea as living among black peaty mud and roots of seaweed 
near high-tide mark; Sars also found it in moderate depths on a muddy bottom amid 
decaying algse, and Sharpe (1911) took his sarsi among floating algse at Woods Hole. 
Another species of the genus M. Tiolothurise 38 was taken from a holothurian. On 
the other hand, Williams (1907) described his natans as swimming at the surface in 
Narragansett Bay, so that the genus is both bottom dwelling and planktonic. 
The Gulf of Maine records of M. ignea, nine in number, are for the months of 
December, March, April, May, June, and October, proving it present the year 
round with no definite seasonal maximum, and always in numbers so small that no 
haul yielded more than a few specimens. At the most it was 1 per cent of the 
copepods, meaning about 20 to 28 specimens per square meter, and usually only 
one or two were detected per haul. 
37 Originally described by Giesbrecht (1895) as Leucltartia grandis, but this generic name being preoccupied he later (Giesbrecht 
and Schmeil, 1898) replaced it by Lucicutia. 
38 Described by Edwards (1891) as Abacola holothurise 
