C A R I D E A. 



573 



while the third and fourth are narrow in Pontonia. The eyes are 

 peculiarly large and projecting. 



The body is depressed, nearly as in Alpheus, and the larger hands 

 have often an Alpheus-like form, being large and oblong, with short 

 fingers. In the known species they are equal in size. The basal 

 scale of the outer antennae is very broad. 



The species swim free, and are not found within the shell of a living 

 mollusc, like some (if not all) Pontoniae. They have a thin shell, 

 and are frequently rich and beautiful in their colours. 



This genus includes the Pontonia macrophthalma of Edwards, 

 Crustaces, ii. 359, and Cuvier's Kegne An. Illust., pi. 52, f. 3. 



(Edipus superbus. 



Corpus pernio depressum. Rostrum Tiorizontaliter latum, oblongo-trian- 

 gulatum, rectum, superne medio carinatum et 6-dentatum, infra prope 

 apicem 2-dentatum, squama basali antennarum externarum plus duplo 

 brevius, basi internarum paido brevius. Pedes antici tenues, manu 

 breviter villosd; proximi wqui, c?*assissimi, manu magnitudine porten- 

 tosd, plus dimidio longiore quam carapax, tumidd, versus basin cras- 

 siore, digito mobili plus quadruplo breviore quam manus, angusto, 

 tenuiore quam immobilis, margine externo angulate sinuoso. Oculi 

 magni. 



Body somewhat depressed. Beak horizontally broad, oblong-trian- 

 gular, straight, carinate along middle, and five dentate above, below 

 near apex two-dentate, not half as long as basal scale of outer 

 antennae, and a little shorter than base of inner antennae. Two 

 anterior feet slender, hand short villous in tufts. Second pair 

 equal, very large and stout; hand more than half longer than 

 carapax, inflated, largest towards base, moveable finger not a fourth 

 as long as hand, narrow, more slender than other finger and angu- 

 lato-sinuous on outer margin. Eyes large. 



Plate 37, fig. 2a, animal, enlarged three and a half diameters; b, 

 extremity of caudal segment ; c, second pair of maxillipeds ; d, outer 

 maxilliped ; e, outline of tarsus ; /, rostrum and outline of carapax. 



Pacific, among the growing corals of Tongatabu. 



144 



