o2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
China: S$.1165, China, 1925-1927, Arthur de Sowerby, 1 female. 
(Probably like the last specimen, this came from Singapore.) 
MEASUREMENTS.—Males, 45-180 mm.; females, 45-90 mm. 
Remarks.—This species is very close to P. pelagicus, and the differ- 
ence in the fronts is shown better by figures than by words (fig. 17). 
The male pleopods are also very similar although the overall curvature 
in P. trituberculatus departs farther from the circular than with P. 
pelagicus (see Stephenson and Campbell, 1959, fig. 2A). Additional 
material will be required to determine whether the details of terminal 
armature do differ slightly in the two species. 
DistriputTion.—China and Japan (Sakai, 1939). 
Figure 18.—Poriunus tuberculosus (A. Milne Edwards), male, Philippines, Sta. 5159, Alb.: 
a, pleopod; b, pleopod tip, upper surface; c, abdomen. (Scales=a, 1 mm.; b, 0.5 mm.; 
c, 5 mm.) 
Portunus tuberculosus (A. Milne Edwards) 
Figures 18; PLATE 6B 
Neptunus tuberculosus A. Milne Edwards, 1861, pp. 333-334, pl. 31 (fig. 5). 
Neptunus (Amphitrite) tuberculosus A. Milne Edwards.—Miers, 1886, p. 176. 
Neptunus (Hellenus) tuberculosus A. Milne Edwards.—Alcock, 1897, pp. 42-43. 
Portunus tuberculosus (A. Milne Edwards).—Stephenson and Campbell, 1959, 
p. 89 (in key).—Crosnier, 1962, pp. 69-71, figs. 97-98, 124-127. 
MareriAu.—China: Sta. 5309, China Sea, vicinity Hong Kong, 
21°53/N., 115°51’E., 62 fm., green mud, Nov. 4, 1908, Alb., 1 female. 
Philippines: Sta. 5104, China Sea off southern Luzon, 14°45'48’N., 
120°12’20” E., Jan. 8. 1908, Alb., 1 male, 1 female, 1 ovig. female; 
