102 
PACIFIC SCIENCE, Vol. VII, January, 1953 
other characteristics, it appeared that the two 
forms might be separated. For example, the 
relative lengths of the scaphocerite to the an- 
tennular peduncle and carpocerite; the relative 
length of the second article of the second 
thoracic legs, described by Coutiere as 2.43 
times the length of the first and by Edmond- 
son as 3.0 times the length of the first; the 
armature of the carpus of the third legs; and 
the presence of spinules on the posterior bor- 
der of the telson. However, all of these char- 
acters are found to be variable and the differ- 
ences between the Indian and the Pacific forms 
removed by the variation within the Hawaiian 
population. 
There are several differences that seem to 
remain between this form and the form de- 
scribed by Coutiere: first, in the Indian Ocean 
form, the rostrum is but slightly produced, 
whereas in this form it usually reaches the end 
of the first article of the antennular peduncle; 
however, Coutiere has shown in his plates that 
this varies in his specimens, and similar varia- 
tion has been seen in the local specimens. Sec- 
ond, the lateral spine of the basicerite is longer 
in Coutiere’s specimens than in the local speci- 
mens; however, in the latter it is quite vari- 
able. Third, the merus of the large chela was 
shown by Coutiere without spines or teeth 
(although he described it as bearing ”une forte 
epine a son apex infero-interne”) ; in the Ha- 
waiian form there is a pronounced and almost 
always acute tooth. The external spine of the 
uropod is shown to be bent in Coutiere’s 
plates, whereas in this form it is straight. Fi- 
nally, de Man in his key (1911: 314) puts em- 
phasis on the presence of two teeth on the 
posterior dorsal margin of the sixth abdom- 
inal segment, teeth that are not found in the 
Hawaiian specimens; however, Coutiere re- 
ported that, "... 2 prolongments epineux . . . 
pouvant parfois manquer ou etre tres peu 
marques." 
Therefore, as all the differences between the 
Hawaiian forms and the type described by 
Coutiere are either bridged by the variations 
noted or are both minor and variable so the 
differences can be anticipated to be bridged 
by the study of additional specimens, it is ad- 
visable to place the species C. laysani as a syn- 
onym of C. paralcyone. 
The specimen from Laysan identified by 
Edmondson (1925) as C. hucephalus (Coutiere) 
was re-examined and found to be a member 
of this species. 
DISTRIBUTION: This species appears to be 
more abundant in deeper water than in shal- 
low water. It has been collected at the follow- 
ing locations in water up to 20 feet deep: at 
Kaneohe Bay, Hanauma Bay, Kahala Beach, 
Waikiki Beach, off Nanakuli, on Oahu; at 
Makena, Lahaina, and 10 miles south of La- 
haina, on Maui; at Halape, Kau Coast, Ha- 
waii, from coral at 35-40 feet deep. It was re- 
TABLE 4 
Deep-water Collections of Crangon paralcyone 
LOCATION 
DEPTH 
U.S.N.M. 
STATION CATALOGUE 
NUMBER* NUMBER 
NE of Hawaii 
fathoms 
29-26 
4053 
63623 
26-50 
4054 
63619 
24-83 
4061 
63608 
Auau Channel 
32-43 
3872 
63607 
34-65 
3875 
63617 
28-43 
3876 
63609, 63612, 
Off Puaaloa, Maui 
26-27 
_ 
63625 
N of Maui 
45-52 
4070 
63626 
49-57 
4075 
63611 
S of Molokai 
23-24 
3847 
63618 
44-73 
3848 
63613 
43-73 
3849 
63621, 63624 
Penguin Bank 
27-29 
4032 
63616 
Oahu 
Off Mokulua Island 
20 
_ 
_ 
1 mile S of Kahala 
25 
— 
— 
Off Diamond Head 
35 
— 
— 
Off Kaena Point 
25 
— 
— 
Off SW Oahu 
6-60 
— 
— 
Off Kauai 
24-43 
4024 
63610 
Off Kaula Rock, 
SW of Niihau 
35 
_ 
_ 
Off Nihoa 
26 
4147 
63622 
27-29 
4158 
63614 
Off French Frigate Shoal 14-17 
3968 
63615 
17 
3971 
63620 
* Station numbers are those of the "Albatross”; 
collections without station numbers were made by the 
"Makua” and "Salpa.” 
