NO. 3556 PORTUNID CRABS—STEPHENSON AND REES 00 
shaped instead of triangular; and the mesobranchial granular patches 
are arranged slightly differently. The male abdomen is longer and 
thinner (particularly so in the smaller specimens) with penultimate 
segment tapering from halfway along its length, and ultimate almost 
twice as long as broad and with a rounded tip. The male pleopod is 
more robust centrally and more pointed distally than figured by 
Shen. However, details of terminal armature coincide with Shen’s 
figure 8d. The present specimens, which include some obviously 
mature, are all much smaller than Shen’s. 
Ficure 19.—Poriunus tweedei (Shen), male, Philippines, Tacloban, A/b.: a, pleopod; b; 
pleopod tip, upper surface; c, abdomen. (Scales=a, 1 mm.; }, 0.1 mm.;c, 5 mm.) 
DistripuTion.—Previously known only from Singapore (Shen, 
1937). 
Genus Scylla de Haan, 1833 
Scylla serrata (Forskal) 
Cancer serratus Forsk&l, 1755, p. 90. 
Scylla serrata (Forsk&l).—Stephenson and Campbell, 1960, pp. 111-115; fig. 2N, 
pls. 4 (fig. 4), 5N, 6C.—Crosnier, 1962, pp. 72-73, figs. 128, 129.— Miyake, 
Sakai, and Nishakawa, 1962, p. 128 (record only).— Dell, 1964b, pp. 59-62. 
