20 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
I., Sulu Archipelago, Tawitawi Group, 5°12’40”N., 119°55’10’E.., 
12 fm., sand, Feb. 22, 1908, Alb., 1 male; Catabata, Mindanao, 
below mouth of river, seine, May 20, 1908, Alb., 1 male; Port San 
Vicente, 130 ft. seine, Nov. 18, 1908, Alb., 1 male, 1 ovig. female; 
Buena Vista, Guimaras Is., Iloilo Strait, seine in mouth of river, 
Jan. 14, 1909, Alb., 1 male; near Mariveles, Luzon, 1913, A.M. 
Reese, 1 male. 
Palau: Sta. 12-832, Madalai district, west end of Koror I., mangrove 
shore grading into mud and sand flat, July 9, 1955, GVF, 1 male. 
MEASUREMENTS.—Males, 12-29 mm.; ovig. female, 15 mm. 
Remarxs.—A male “16 mm., Port San Vicente, Nov. 18, 1908 
Alb.” has a very broad, female-like abdomen, but fully developed 
male pleopods are present. 
Distripution.—Amboina, Andamans, Singapore, and Australia. 
Portunus dubius (Laurie) 
FIGuRE 3; PLATE 2A 
Neptunus (Achelous) dubia Laurie, 1906, pp. 416-417, fig. 9. 
MareriAu.—Philippines: Sta. 5140, Jolo Lt., 6°08’45’N., 
121°03’E., 76 fm., fine coral sand, Feb. 15, 1908, Alb., 1 female (13 
mm.); Sta. 5432, Corandagos I., 10°37’50”N., 120°12’E., 51 fm., 
Apr. 8, 1909, Alb., 1 male (12 mm.). 
Description.—Front: Protruding beyond inner supraorbital angles 
and 4-toothed. Teeth sharp and directed dorsally, laterals the 
larger and inclined outward. Inner supraorbital angles rounded, 
upper border of orbit with single fissure, lower border with acute 
forward-directed tooth. 
Anterolateral teeth: Nine, first the stoutest, gradually decreasing 
in size with eighth the smallest and ninth slightly larger. 
Carapace: Very long, breadth about 1.3 times length. Surface 
microscopically granular among which major patches of granules are 
visible. Protogastrics diffuse and merging with ill-developed meso- 
gastrics, which in turn connect by a central granular line to trans- 
versely situated metagastrics. Patch behind orbit in line with third 
anterolateral tooth; further diffuse patch opposite fourth to ninth 
teeth, and merging with epibranchial. Paired cardiac merges with 
median postcardiac. Pair of lateral postcardiacs. Mesobranchials 
large and diffuse but terminates abruptly on posterolateral margins 
by granular ridges. 
Fifth leg: Merus short, length 1.8 times breadth, and with finely 
denticulated posterior margin. Propodus with fine hairs but no 
spines. 
Third maxilliped: Hirsute and produced laterally. 
