Hawaiian Crangonidae — BANNER 
67 
the articles of the antennular peduncle were 
shorter and broader (second article ranges to 
1.7 times as long as broad); the stylocerite 
was shorter than the first antennular article; 
the relative lengths of the antennular pedun- 
cle, the scaphocerite, and the carpocerite were 
not constant; the number of spines on the 
merus of the large and small chelae varied, but 
in all cases were numerous; the second carpal 
article was at times 0.7 or 0.8 the length of the 
first, with the other articles varying to a simi- 
lar degree; the merus of the third legs was 
more slender, up to 4.0 times as long as broad; 
and finally, the number of spines on the pro- 
podus of the third legs usually was less than 
the 10 spines of the type specimen, often 
around six or seven. 
The most remarkable variation was ob- 
served in the orbital teeth of three specimens. 
Two specimens, one shown in Figure 20c, had 
the orbital teeth asymmetrically developed, 
with a tooth of the usual type on one side and 
the other side terminating in an obtuse non- 
projecting angle. The third specimen was 
lacking in the orbital teeth on both sides. 
This species has been named after the island 
from which it was collected. 
relationship: This species apparently be- 
longs to the group of species designated in 
this paper as the C. hailstonei complex, and for 
that reason its characteristics have been set 
forth in Table 2. It can easily be separated 
from all other members of this complex and 
from C. seurati (Coutiere) (which probably 
also belongs in the complex) by the extraor- 
dinary elongation and great thinness of the 
fingers of the small chela and by the strong 
biunguiculation of the dactylus of the third 
legs. Other characteristics which will separate 
the species from one or several of the group 
are the size of the rostrum, the heaviness of 
the antennular peduncle, the rounded condi- 
tion of the palmar crest and the bulbous dac- 
tylus of the large chela, the relatively longer 
second carpal article of the second legs, the 
breadth of the merus of the third legs, and the 
lack of the ischial spine on these legs. 
DISTRIBUTION: This species is represented 
by 13 specimens which were collected on 
Oahu at Hanauma Bay, Kahala, Waikiki, and 
Nanakuli (all except the Kahala specimen 
from water 10 to 20 feet deep) and on Hawaii 
at Halape on the Kau Coast, one specimen 
from 10 feet, one from 40 feet deep, the last 
two collected by R. W. Hiatt. 
Crangon collumiana (Stimpson) 
Fig. 21 a-h 
Alpheus collumianus Stimpson, Acad. Nat. Sci. 
Phila., Proc. 12: 30, I860. 
DESCRIPTION: Rostrum acute, short, reach- 
ing to middle of visible portion of first anten- 
nular articles, demarked laterally from orbital 
hoods by abrupt depressions, with small ros- 
tral Carina that extends posteriorly between 
orbital hoods. Orbital hoods rounded with 
anteriolateral margins produced into acute 
teeth as long as rostrum. Margin between 
base of rostrum and orbital teeth convex. 
Lateral spine of stylocerite acute, reaching 
beyond rostrum nearly to end of first anten- 
nular article. Second article of antennular 
peduncle usually 1.8 times length of visible 
portion of first article, 1.7 times length of 
third article. Lateral spine of basicerite long, 
acute, reaching beyond end of first antennular 
article. Scaphocerite with strong lateral spine 
that exceeds squamous portion by about 0.25, 
usually reaching end of antennular peduncle. 
Tip of carpocerite extending beyond end of 
scaphocerite. 
Large chela 2.3 times as long as broad, lat- 
erally compressed and distally sculptured. [For 
terminology of crests and grooves, see Fig. 
17^.] Superior crest heavy, rounded, terminat- 
ing distally as strong subacute tooth above 
dactylar articulation; merging with superior 
margin of palm almost immediately proximal 
to transverse groove. Transverse groove deep, 
abrupt, and merging with superior groove. 
Superior groove deep, broad, but terminating 
immediately proximad of transverse groove. 
Plaque crest rounded, heavy, and well defined 
