266 STALK-EYED CRUSTACEA 



the endostome are usually not developed. The external 

 maxillipedes are closely applied to the buccal cavity ; the 

 third joint is longer than the fourth, and distally 

 truncated ; the fourth joint longer than broad, distally 

 truncated, not emarginate, at the antero-internal angle. 

 The first pair of legs, in the adult male, is unequal and 

 well developed ; the fourth joint of the larger limb is 

 trigonous, with the superior and inferior margins denticu- 

 lated ; fifth joint short, with usually a lobe or tooth on 

 the inner margin ; hand vertically deep and compressed, 

 the palm with a stridulating ridge on its inner surface, 

 composed of a vertical series of short raised lines or 

 tubercles ; fingers, either distally acute or truncated, are 

 toothed on the inner margins. The walking legs are 

 somewhat elongated, with the joints usually granulated 

 and their last joint styliform. The abdomen, in the male, 

 is seven-jointed, with the terminal segment small and 

 triangulate. 



Range. — Atlantic and Pacific Oceans, in warm seas, 

 living for the most part near, but out of, the water, in 

 holes in the sand or mud. 



Synopsis of the Species. 



A. Ocular peduncles prolonged beyond the cornea as 

 a spine or style. — (O. iiiaci-occra.) 



B. Ocular peduncles not prolonged beyond the 

 cornea as a spine or style. — {O. arenaria.) 



I. Ocypoda macrocera. 



Ocypoda macrocera . . . H. Milne Edwards, Heller, 



Kingsley. 



Orbits wide, oblique, angle obtuse; eyes with a spine 

 which in most cases is long and cylindrical, extending far 



