120 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
only some twenty miles from land; and so many off-shore hauls were 
made (e. g., Stations 23, 24, 27, 28, 29, 30, 31) that its absenee from the 
more nearly oceanic part of the Gulf can hardly be laid to an accidental 
failure to capture specimens. It was not found in the northeastern 
part of the Gulf, nor in the Grand Manan Channel (Stations 33, 34, 
35, 36, 37); but its absence from the latter is probably associated with 
the general poverty of the zodplankton in that region. It was taken 
three times in the closing net, at 30 fathoms (Stations 22, 25), and 
20 fathoms (Station 19), and once on the surface (Station 32). | Proba- 
bly it would have been found oftener at the latter horizon had we 
made more surface hauls near shore, especially at night. But as it 
happened, most of the night hauls were made far off shore, where 
Clione was not found. The hauls afford the following data on tem- 
perature and salinity :— 
Station 2 30fathoms temperature 41.5° salinity 32.6%o. 
Station 19 20 fathoms temperature about salinity about 32.5%p. 
47° 
Station 22 30 fathoms temperature about salinity about 32.6%. © 
46.5° 
Station 25 30 fathoms temperature about salinity about 32.9% . 
oo! 
Station 32 surface temperature 57° salinity 32.5%p. 
The salinity ranges from 32.5-32.9%po, the temperature from 41.5° 
to 57°; and at all other stations where Clione was taken, the nets, 
in their course, passed through waters with physical characters lying 
within these limits. In the Gulf, adult Clione occurs over a wide 
range of salinity and temperature, in water fully 10° warmer than the 
Labrador Current. But our collections throw no light on the condi- 
tions under which it reproduces. 
Limacina balea (Plate 5)— The occurrence of this pteropod was 
even more circumscribed than that of Clione limacina. It was taken 
at Stations 19, 22, 23, 24, 25, 30, 40, 7. e., in two general regions, first 
in the northwest corner of the Gulf, off Casco Bay and over the deep 
trench beyond Platt’s Bank and Jeffrey’s Bank, and second, on 
German Bank. The known salinities and temperatures of the 
captures are:— 
Station 19 25fathoms closing-net temperature 47° salinity 32.5% 
Station 25 30 fathoms closing net temperature salinity 32.9% 
about 48° 
Station 30 surface temperature salinity 32.7%o 
about 52° 
| 
. 
