618 
BULLETIN OF THE BUREAU OF FISHERIES 
Specimens about 4-0 mm long. — The advancement in development is not great. 
In specimens probably of U. jloridanus the body has become rather more robust, the 
depth being contained in the length to the end of the notochord about 3.0 times. 
The caudal portion of the body has become proportionately rather longer, yet it 
remains decidedly shorter than the rest of the body. The mouth is less strongly 
vertical, the tip of the lower jaw now being slightly below the level of the middle of 
the eye. The ventral fins have increased in length and reach to or a little beyond the 
vent. 
No change in color apparently has taken place. Most larvae have more dark 
dots above the base of the anal than the specimen drawn (fig. 130). 
The difference between U. jloridanus and U. regius remains one of color only, 
as in the smaller specimens, if both species actually are represented among the young 
at hand. The distal part of the membranes of the ventrals being black in jloridanus, 
and pale in regius. Furthermore, in regius of this size, there generally are no black 
chromatophores above the base of the anal, though a few exceptions have been 
noticed. 
U. chuss continues to differ from both regius and jloridanus in having a longer 
and more slender tail, though it has become proportionately shorter. Yet it is fully 
equal (without the caudal finfold) in length to the rest of the body, and its depth 
just posterior to the vent is contained 3.2 times in its length. The mouth is less 
nearly vertical than in the other species, and the dorsal profile is rounder. In color 
this species differs very little from jloridanus, the black markings being similarly 
placed, though rather more numerous. 
Specimens about 5.0 mm long . — U. jloridanus apparently is missing among the 
specimens of this size. In fact, no specimens between a length of about 4.0 and 21 
mm appear to be at hand. 
In U. regius the body has continued to increase in robustness, the depth now 
being contained in the length to the end of the notochord about 2.8 times. The 
caudal portion of the body has increased further in proportionate length, and is con- 
tained about 1.6 times in the length to the end of the notochord. 
It is deep and compressed, its depth just posterior to the vent being contained 
about 2.0 times in its length. The head is rather deep, compressed, and is contained 
2.75 times in the length to the end of the notochord. The eye is nearly twice as long 
as the snout and is contained 2.75 in the head. The mouth is strongly oblique (not 
vertical), the tip of the lower jaw being slightly below the middle of the eye, and the 
maxillary reaches about under the middle of the eye. The notochord is bent upward 
very slightly distally. The vertical fin membranes remain continuous. The rounded 
caudal contains fairly well developed rays, but the dorsal and anal are more retarded 
