78 
PACIFIC SCIENCE, Vol. VII, January, 1953 
the two varieties by the following character- 
istics: First, the other forms have a distinct 
but subacute dorsal carina, while the Hawai- 
ian variety is usually evenly rounded dorsally. 
Second, the base of the rostrum is separated 
from the orbital hoods by rather shallow 
rounded depressions instead of deep narrow 
grooves as de Man describes them. Third, the 
inferior internal margin of the merus of the 
large cheliped is without a small obtuse tooth 
at its distal extremity in the local specimens. 
From the original type for the species and 
from de Man’s variety, this variety is distin- 
guished, as is C gracilis var. alluaudi, by the 
lack of the secondary unguis on the dactylus. 
Future workers may decide that the lack of 
the secondary unguis is sufficient to separate 
this form, together with Coutiere’s, as a spe- 
cies distinct from that of Heller. Except for 
the fact that this is not supported by other 
differences, I would be inclined to make this 
separation myself. However, as Coutiere did 
not think of this as a specific difference, as 
there are no supporting differences, and as 
there is the swelling on the dactyl which may 
be the remnant of the secondary unguis, I 
have decided to leave the form within this 
species. The new variety for the Hawaiian 
specimens was created to emphasize this dif- 
ference and the fact that these specimens do 
not have the deep grooves between the orbital 
hoods and the rostrum. 
C. gracilis var. simplex is most closely related 
to C. edmondsoni Banner and C. latipes Banner 
of the other local species. The differences be- 
tween them are set forth in Table 3. 
DISTRIBUTION: This species has been col- 
lected both from the shallow reefs and in 
waters up to 20 feet deep at the following lo- 
cations on Oahu : Waimanalo, Hanauma Bay, 
Black Point, Waikiki, Nanakuli, Mokuleia, 
Kawela Bay, and Punaluu. On Maui it was 
collected at Makena, Kalama Park, Lahaina, 
and four localities north and south of Lahaina. 
Edmondson (1925) reported it (as C. gracilis') 
from Laysan and Lisianski Islands. No speci- 
mens were collected by the "Albatross.” 
Edmondson (1925) also recorded the spe- 
cies from Johnston Island in the central Pa- 
cific. It and its two varieties have been re- 
ported from the Netherlands Indies, the Indian 
Ocean, and the Red Sea. 
Crangon edmondsoni sp. nov. 
Fig. 26 a-p 
TYPE specimen: a female 24 mm. long col- 
lected at Kawela Bay, Oahu, by C. H. Ed- 
mondson (Bernice P. Bishop Mus. 4059). 
DESCRIPTION : Rostrum narrow, longer than 
breadth at base; concave sides with 3 or 4 
pairs of short bristles; produced as acute tip, 
reaching to or slightly beyond end of first an- 
tennular article, distally depressed; slightly 
rounded dorsally, without carina. Orbital 
hoods continuous with curvature of carapace 
posteriorly, not sharply delimited from sur- 
rounding carapace and separated from base of 
rostrum by only slight shallow depressions. 
Anterior margin of orbital hoods produced 
into acute, dorsally flattened teeth, reaching 
almost to mid-point of rostrum. Margin of 
orbital hoods between rostral base and apex 
of hoods straight to concave. 
Visible portion of first article of antennule 
slightly larger than second and 0.25 longer 
than third. Stylocerite strong, reaching to 
middle of second antennular article. Entire 
dorsal surface of antennular peduncle with oc- 
casional short setae, with denser groupings of 
longer setae at points of articulation. Inner 
flagellum about 7 times as long as peduncle; 
outer flagellum 4 times as long as peduncle. 
Lateral spine of basicerite of antenna acute, 
tip not reaching to end of first antennular ar- 
ticle. Scaphocerite as long as antennular pe- 
duncle with lateral spines only slightly longer 
than squamous portion, squamous portion ta- 
pering toward tip. End of carpocerite reach- 
ing slightly beyond scaphocerite. Antennal 
flagellum longer than body, about twice as 
long as inner antennular flagellum. 
Large chela elongate, tapering, margins 
rounded, laterally compressed, 3.4 times as 
