

RATHBUN: DECAPOD CRUSTACEANS. 313 



height of the palm is a little greater than its superior length ; fingers irregularly 

 dentate and narrowly gaping for their basal half. Fourth leg a trifle longer than 

 first and 1^ times as long as carapace ; merus joints with a blunt subdistal angle, 

 that of third leg widening in the middle portion; propodus of last leg f as long- 

 as dactylus, measured on outer margin. 



Abdomen of male subtriangular, with the margin from the third to the sixth 

 segment concave ; first segment widest, secoud next, third next ; first segment 

 crossed by a sharp, laminar, transverse crest ; suture between second and third 

 and between fifth and sixth straight, and suture between third and fourth and be- 

 tween fourth and fifth concave forward, so that segment 3 is wider in its outer 

 part than in the middle, and segment 5 is wider in the middle than at the sides ; 

 segment 7 subtriangular, sides concave, end rounded. 



Dimensions. — £, length 13.5 mm., greatest width (at fourth tooth) 16.4 mm., 

 width between outer angles of orbit 14 mm., width of front on anterior edge 

 5.6 mm. 



Type 7242 Coll. Museum of Comparative Zoology. 



P. larbouri is the only Parathelphusa known with exactly five similar teeth and 

 no additional spiuules. All the species with numerous (more than four) spines 

 and spiuules are restricted to the continents of Africa and Asia. 



PORTUNIDAB. 



Portunus sanguinolentus (Herbst). 

 Neptunus sanguinolentus Alcock, op. cit., 1899, 68, p. 32. 

 Celebes: Makassar; 1 9 juv. 



Portunus pelagicus (Linne). 

 Neptunus pelagicus Alcock, op. cit., 1899, 68, p. 34. 

 Celebes: Makassar; 2 <J juv. 



Charybdis cruciata (Herbst). 

 Charybdis (Goniosoma) crucifera Alcock, op. cit., 1899, 68, p. 51. 

 Celebes : Makassar ; 1 small <J . 



Thalamita crenata Latreille. 

 Thalamita crenata Alcock, op. cit., 1899, 68, p. 76. 



Celebes : Makassar ; 1 9 • 

 Moluccas : Amboyna ; 1 9 . 



Thalamita prymna (Herbst). 

 Thalamita prymna Alcock, op. cit., 1899, 68, p. 78. 

 Dutch New Guinea : Soroug ; \ $ • 



