134 
PACIFIC SCIENCE, VoL VII, January, 1953 
Carpal articles of second legs with ratio 
10 : 11 : 5 : 6 : 7. 
discussion: Unfortunately all of the three 
specimens in the collection were dredged from 
deeper water and only one is reasonably in- 
tact, the others having lost most of their ap- 
pendages in the rough handling in the dredge 
net. In the Edwardsi Group, the largest of the 
genus, positive identification cannot be made 
without reference to the small chela of the 
male; and, as the small chela of the sole male 
was lacking in these specimens, they are re- 
ferred to this species with some doubts. 
The specimens compare quite well with the 
description and plates of Coutiere except on 
the following points: 
C. leptochirus 
Second antennular article 
1.4 times length of visi- 
ble portion of first 
Scaphocerite exceeding 
antennular peduncle by 
0.1 its length 
Large chela with parallel 
sides; proximal edge of 
superior groove round- 
ed; depressed areas on 
upper portions of faces 
very narrow 
Meri of large and small 
chelae each with 4 spines 
Second carpal article of 
second legs 0.7 length of 
first 
Third legs without ischial 
spine, merus 7.5 times as 
long as broad 
Hawaiian Form 
Second antennular article 
as long as visible portion 
of first 
Scaphocerite exceeding 
antennular peduncle by 
0.2 its length 
Large chela with slight ta- 
per; proximal edge of 
superior groove abrupt, 
overhanging; depressed 
areas on faces broader 
Meri of large and small 
chelae with 2-3 spines 
Second carpal article of 
second legs 1.1 length of 
first 
Third legs with ischial 
spine, merus 5.5 times as 
long as broad 
These differences appear to be decisive 
when listed out in this fashion; however, 
studies on other species in this group and in 
other groups of the genus have shown that 
each of these characteristics are variable at 
least to the extent here observed. Therefore no 
dependence can be placed upon any one of 
the differences listed; possibly in aggregate 
they are significant, but without the important 
small chela of the male, and with but a single 
intact specimen to study, I do not believe 
that the designation of this form as a distinct 
species is warranted. 
DISTRIBUTION: The three specimens were 
taken in a dredge haul off Diamond Head, 
Oahu, in 100-200 feet of water. Coutiere’s 
specimens came from the Indian Ocean. 
Crangon crassimanus (Heller) 
Fig. 49 a-k 
Alpheus crassimanus Heller, Reise der . . .No- 
vara. . . . Zook Theil 2(8): 107, pi. 10, fig. 
2, 1865. 
DESCRIPTION: Rostrum acute, reaching al- 
most to end of first antennular segment, with 
margins gradually curving out to merge with 
frontal portion of orbital hoods and carapace, 
demarked from orbital hoods by broad, shal- 
low depression. Subacute rostral carina arising 
between anterior portion of orbital hoods. 
Orbital hood hemispherical, without keels or 
ridges. 
Lateral spine of stylocerite slightly longer 
than first antennular article. Antennular pe- 
duncle slim, with second article equal to or 
longer than visible portion of first, from 1.5 
to 3.0 times as long as third. Lateral spine of 
basicerite not as long as stylocerite. Scapho- 
cerite with heavy lateral spine; lateral margin 
concave; squamous portion narrow, with an- 
terior margin not rounded but joining spine 
at acute angle. Scaphocerite and carpocerite 
almost equal, slightly longer than antennular 
peduncle. 
Large chela heavy, 2.2 times as long as 
broad, laterally compressed, 1.7 times as high 
as thick, with grooves and depressions. 
Rounded transverse groove on superior mar- 
gin proximal to articulation of dactylus, con- 
tinuous with irregular depression with 
rounded edges on both inner and outer face. 
Proximal margin of transverse groove, in pro- 
file, rounded and sloping back to superior 
margin of chela. Another groove on inferior 
margin of chela, directly below superior 
groove, rounded only distally and demarked 
by abrupt shoulder proximally, ending 
abruptly on outer face about 0.2 distance from 
lower edge, and on inner face gradually di- 
minishing but still visible beyond mid-line. 
Dactylus 0. 3-0.4 length of chela, heavy and 
