NO. 3556 PORTUNID CRABS—STEPHENSON AND REES an 
114°46’E., 37 fm., Oct. 24, 2 males; Sta. 5308, 21°54’N., 115°42’E., 
62 fm., Nov. 4, 1 male. 
MrasurEMENTS.—Males, 15-29 mm., females, 14-23 mm., ovig. 
females, 16-22 mm., juvs. 6-10 mm., Sacculina infected specimens, 
14-18 mm. 
Remarxs.—In addition to the distinctions between this species and 
P. spinipes as listed by Gordon, it lacks the very fine tapering point 
on the male pleopod (compare figs. 7c and 14c). 
Distrinution.—Madras, Andamans, Gulf of Martaban, Arakan 
Coast, and Muscat. 
Portunus rubromarginatus (Lanchester) 
Achelous rubromarginatus Lanchester, 1900, pp. 746-747, pl. 46 (fig. 8). 
Neptunus (Amphitrite) rubromarginatus (Lanchester).—Shen, 1937, p. 104. 
Portunus rubromarginatus (Lanchester).—Stephenson and Campbell, 1959, pp. 
112-113, figs. 2K, 3K, pls. 3 (fig. 3), 4K, 5K. 
MareriaAu.—Philippines: Jolo, ship’s side, electric light, 14 fm., 
Feb. 8, 1908, Alb., 1 female; Jolo anchorage, electric light, Mar. 5, 
1908, Alb., 1 female; Sta. 5561, Tutu Bay (Jolo), coral and sand, 
Sept. 19, 1909, Alb., 3 males, 1 female; Labuan Blanda I., Buton 
Strait, marginal coral, Dec. 13, 1909, Alb., 1 female. 
MEASUREMENTS.—Males, 11-16 mm.; females, 16-29 mm. 
RemMarKs.—The anteroexternal angle of the merus of the third 
maxillipeds is produced laterally but not strongly so (see Stephenson 
and Campbell, 1959, pl. 5K). This leads to uncertainty in the key 
(above authors p. 90, couplet 16). The species is possibly closest 
to P. curvipenis Stephenson (1961a, pp. 106-108, figs. 1G, 3E; pl. 2, 
fig. 3; pls. 4E, 5B). 
DistripuTion.—Malay Archipelago, Hong Kong, South China 
Sea, and Australia. 
Portunus cf. rubromarginatus 
PLATE 3A 
MaTERIAL.—Japan: Sta. 5081, off Omai Saki, 35°14’N., 138°05’E., 
surface, Oct. 19, 1906, Alb., 1 incomplete female (13 mm.). 
Remarks.—Only the carapace and two chelae are present. The 
differences compared with typical P. rubromarginatus are more 
spiniform frontal teeth (pl. 34), more rounded granular eminences 
in the cardiac region of the carapace, more spiniform first eight 
anterolateral teeth, and longer ninth tooth. 
Portunus rugosus (A. Milne Edwards) 
Ficures 8-11; PLates 3p, 4, 5 
Neptunus rugosus A. Milne Edwards, 1861, p. 335, pl. 33 (fig. 3).—Hess, 1865, 
p. 139.—A. Milne Edwards, 1873, pp. 156-157.—Miers, 1886, pp. 176-177 
