TABLE 1 Continued 
406 
PACIFIC SCIENCE, Vol. XIX, October 1965 
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age or breakage to the rostrum which fre- 
quently occurs during sampling and preserva- 
tion of the specimens. 
The largest specimen of G. ingens on record 
is a giant female measuring 350 mm total length 
(from the tip of the rostrum to the end of the 
telson). This specimen was captured with the 
Isaacs-Kidd Midwater Trawl in 1955 on the 
Scripps Institution of Oceanography’s Eastropic 
Expedition in the equatorial Pacific and was de- 
scribed by Clark ( 1961 ) . This giant specimen 
is more than IV 2 times larger than the pre- 
viously reported largest specimen, a male from 
the Talisman Expedition (Hansen, ,1927) with 
a body length of 185 mm (210 mm total length 
including the rostrum) which was taken in the 
Atlantic Ocean south of the Azores. None of 
the specimens from the 1950-53 Scripps col- 
lections in the eastern Pacific exceeded these 
lengths. The largest is a male of 139 mm body 
length ( 160 mm including the rostrum). 
Of the 204 specimens of G. ingens examined 
from the 1950-53 Scripps collections, none of 
the 112 females possessed a completely devel- 
oped brood pouch. Although many of the larger 
specimens possessed oostegites as long as or 
longer than the thoracic legs, none was com- 
pletely developed to form a true marsupium 
containing eggs or embryos. 
Only three previous accounts of sexually 
mature females of this species have been re- 
ported. One was described by G. O. Sars ( 1885 ) 
from the Challenger Expedition and measured 
157 mm total length. A second, described by 
Fage (1941) from the Dana Expedition, meas- 
ured 140 mm ( 165 mm including the rostrum). 
The oostegites on the latter specimen were 
clearly longer than the thoracic legs and meas- 
ured 50 mm in length and 18 mm at their 
greatest width. The third was the giant female 
specimen described by Clark (1961). 
The criterion used for the determination of 
sexual maturity in female mysids is the pres- 
ence of a well developed marsupium. In the 
case of the males it is more difficult to recog- 
nize sexual maturity because of the difficulty in 
determining when the male genital pore, located 
on the last thoracic leg, is mature and functional. 
The sizes 140 and 157 mm body length may 
be considered as the minimum sizes of sexual 
