ANCEUS MAXILLARIS, 193 
and articulation to those of the male. We have found no 
other trace of mouth organs in these developed females. 
The two succeeding segments of the body are quite dis- 
tinct, very short, and rounded at the sides, but the three 
terminal segments are consolidated into a large oval 
mass covered with delicate membranes, through which 
the eggs and young are plainly visible; the black eyes 
of the latter giving to this part of the body a speckled 
appearance, and showing at the same time that the 
arrangement of the young within the incubatory pouch 
is completely irregular ; and we have never seen the sym- 
metrical arrangement of the larve as figured by M. Hesse 
in the gravid female. The tail (pleon) and its appen- 
dages resemble those of the male, and the legs do not 
exhibit any more marked differences beyond being some- 
what more slender. One of the young extracted from 
the pouch of the parent, and which attains to more than 
a third the length of the adult animal before it quits the 
Ovi sac, is represented at the left hand side of the above 
engraving. 
The state of these animals previous to arriving at com- 
plete maturity offers several circumstances sufficiently 
remarkable to account for the larger sized larve (if 
we may so term them) having been mistaken for fully 
developed females. It is this state which was first 
described by Slabber and Montagu, and also by Mr. 
Spence Bate, who confounded it with the adult animal, in 
the “ Annals of Natural History ” for September, 1858. 
The large mass formed by the consolidation of the three 
posterior segments of the body is of a very elongated 
oval shape, and in the individuals described by Montagu 
was of a fine blue colour; whence the specific name 
which he applied to it. It varies, however, not only in 
different individuals, but also in different states of the 
VOL. II. O 
