NO. 3556 PORTUNID CRABS—STEPHENSON AND REES 2h 
Male abdomen: Penultimate segment with regularly tapering 
sides, ultimate segment triangular. 
Male first pleopod: Grossly swollen so that normal distinction be- 
tween basal and terminal elongate portions cannot be made. Inner 
side curves regularly and bears forwardly directed bipinnate bristles 
along half its length. Outer surface bears conspicuous flattened lobe 
thinly beset with elongate bipinnate bristles or hairs, these extending 
to upper surface where they are denser. Appendage terminates 
Ficure 3.—Portunus dubius (Laurie), male, Philippines, Sta. 5432, Alb.: a, pleopod; 
b, abdomen. (Scales=a, 1 mm.; b, 5 mm.) 
abruptly and bears subterminal aperture directed upward. Folds 
of cuticle surrounding this aperture give a rosette appearance and 
are densely covered with minute inwardly directed spinules. 
Remarks.—This species resembles P. orbicularis (Richters) which 
has been redescribed recently by Crosnier (1962). It differs in pos- 
sessing a spiniform front, more granular carapace, and a male pleopod 
which is different from all other known species of the genus. 
The abdomen of the single male in the present collection is nar- 
rower, and the ultimate segment is longer than figured by Laurie 
(1906, fig. 9). 
Distrisution.—Previously from Gulf of Manaar and Negombo, 
Ceylon. 
Portunus euglyphus (Laurie) 
Figure 4; PLATE 28 
Neptunus (Amphitrite) euglyphus Laurie, 1906, pp. 413-414, figs. 6, 7. 
