48 
PACIFIC SCIENCE, VoL VI, January, 1952 
thereafter. Pectorals short and rounded, 
origin of uppermost ray above most posterior 
point on opercle, nearer dorsal outline than 
to upper edge of silvery lateral band. 
Distance from snout to ventrals contained 
about 1.6 times in ventral-caudal distance. 
Vent near but not quite at the origin of the 
anal, preceded on the ventral midline by 
about four pairs of body scales. 
Scales cycloid, ovoid on sides, absent from 
head and front of body. About 38 scales or 
scale pockets in a longitudinal series on the 
holotype; scales lacking on paratypes. 
Color in alcohol whitish except for silvery 
eye, cheek, occipital region, and lateral band. 
Lateral band broadest about under origin of 
second dorsal, slightly less than an eye diam- 
eter in width (in these small specimens) . Silvery 
lateral band disappears about midway along ‘ 
caudal peduncle, reappearing again as a ! 
rather indefinite, irregular silvery spot just j 
before caudal base. In life this fish is bril- 
liantly silvery. [It is my impression that the 
silvery reflections came from the whole fish 
and not merely from the regions that retain 
the silver coloration in alcohol.] 
a 
Fig. 1. Holotype of Iso hawaiiensh. a. Lateral aspect; 
h, cross section through the deepest part of body. 
TABLE 1 
Measurements* and Counts on ho hawaiiensis 
CHARACTER 
HOLOTYPE 
PARATYPES 
Total length 
34.2 mm. 
24.0 mm. 
22.5 mm. 
Standard length 
28.0 mm. 
20.0 mm. 
18.5 mm. 
Snout to first dorsal 
538 
490 
508 
Snout to second dorsal 
693 
661 
703 
Length of first dorsal base 
54 
60 
59 
Between dorsals 
143 
110 
97 
Length of second dorsal base 
193 
235 
249 
Snout to ventrals 
438 
415 
379 
Snout to anus 
636 
570 
535 
Anus to anal 
36 
45 
49 
Length of anal base 
239 
275 
276 
Length of caudal peduncle 
175 
160 
168 
Depth of caudal peduncle 
86 
90 
97 
Depth of body 
293 
295 
270 
Width of body 
136 
140 
141 
Head length 
275 
235 
243 
Upper jaw length 
104 
no 
114 
Snout length 
93 
80 
86 
Eye diameter 
100 
105 
114 
Width of interorbital 
86 
90 
103 
Length of first dorsal spine 
82 
75 
81 
Length of longest anal ray 
118 
105 
108 
Length of pectoral 
168 
165 
178 
Length of ventral 
121 
115 
108 
Greatest width of silvery band 
79 
85 
76 
Number of pectoral rays 
13 
12 
13 
Number of caudal rays 
M5-I 
I-15-I 
I-15-I 
Number of first dorsal spines 
IV 
V 
V 
Number of second dorsal rays 
I, 16 
I, 16 
I, 16 
Number of anal rays 
I, 22 
I, 20 
I, 24 
All measurements, except standard and total length, given in thousandths of the standard length. 
