24 
PACIFIC SCIENCE, Vol. VII, January, 1953 
telson with 3 additional pairs of long setae. 
Anus at anterior end of ventral side of telson; 
no anal tubercles. 
Color variable, with red and brown chroma- 
tophores. 
discussion: In addition to the type speci- 
men, this series is represented in the collec- 
tions by four other specimens: 
1. An ovigerous female, 27 mm. long, col- 
lected olf Waikiki Reef, Oahu, from a coral 
head in water about 20 feet deep. 
2. A male, 21 mm. long, collected in Hana- 
uma Bay, Oahu, from a coral head in about 
10-15 feet of water (chelae lacking). 
3. An ovigerous female, 20 mm. long, col- 
lected offshore at Halape, Kau Coast, Hawaii, 
from a head of Porites in 8-9 feet of water by 
R. W. Hiatt. The eggs borne by this specimen 
were near hatching and contained larvae in the 
protozoal stage of development; the eggs 
were 0.25 mm. by 0.72 mm. in diameter. 
4. A male, 17.2 mm. long, collected at the 
same place as specimen 3 by R. W. Hiatt. 
The four specimens agree well with the type 
in almost all characteristics except for minor 
variations in proportions, e.g., the chela varies 
from a little over 3 to a little less than 4 times 
as long as broad, and the length-breadth rela- 
tionship of the telson varies by 10-15 per cent. 
These differences are well within the range of 
normal and expected variation. 
Specimen 4 shows greater differences from 
the type than do 1 and 2. In 4 the anterior re- 
gion of the carapace, while bearing the same 
proportions as that of the type in respect to 
the length tf the rostrum, etc., is more closely 
pressed to the bases of the antennae; in con- 
sequence, the eyes are almost entirely con- 
cealed in lateral view, so that at first glance the 
rostrum appears to be longer than that of the 
type (Fig. 6c). The chelae also show a series 
of finer teeth and generally longer and thinner 
proportions (Fig. 6g-h). 
However, it is specimen 3 that shows the 
greatest differences. In this specimen the chela 
(only one is present) bears few and conspicu- 
ous teeth on both fingers instead of fine teeth 
on the fixed finger in opposition to the blade 
of the movable finger (Fig. 6i ) . Some of the 
teeth appear to be blunted or broken. 
It may well be that this last specimen repre- 
sents another species. However, inasmuch as 
all other characteristics are well within the 
range of expected variation, it must be as- 
sumed, until other specimens are studied, that 
this is an extreme variation from the normal. 
Another reason for this conclusion is the fact 
that this specimen and specimen 4 were col- 
lected from the same habitat and are of differ- 
ent sexes. It is possible that these two speci- 
mens were mates living in the same burrow, 
as is common among the crangonids. 
The species is named in honor of Robert H. 
Hiatt, the collector of some of the specimens 
of this species and of other specimens valu- 
able to the study. 
RELATIONSHIP: There is only one other spe- 
cies in this genus, N. euryone (de Man). If the 
specimens discussed above all belong to N. 
hiatti, then apparent differences between this 
species and N. euryone in the chelae, second 
legs, etc., are within the range of variation of 
the species. However, there are four sets of 
characteristics that exceed the range of vari- 
ations noted and which will serve for the 
separation of the two species. In N. hiatti 
the rostrum reaches beyond the end of the 
first antennular article; the stylocerite reaches 
to the end of the second antennular article; 
the merus of the third legs is 4.5 times as 
long as broad, 2.3 times as long as the car- 
pus, and 4.5 to 5.5 times as long as the dac- 
tylus; the telson is 13 times as long as the 
terminal triangle. On the other hand, in N. 
euryone the rostrum does not reach past the 
middle third of the first antennular article; the 
stylocerite reaches only to the middle of the 
second antennular article; the merus of the 
third legs is 7.5 times as long as broad, 1.6 
times as long as the carpus, and only 3.0 times 
as long as the dactylus; the telson is 10 times 
as long as the terminal triangle. 
