338 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Thus far I have considered the American and East- Atlantic form 

 the same as that from the Indo-Pacific region, but have now come to 

 the conclusion that they are different. 



Diagnosis. Tubercles of carapace flattened, depressed. No bristles 

 on inner surface of palm. Merus joints of legs not especially elon- 

 gated or narrowed. 



Description. Carapace ovate, thin, disk-like, longer than wide, 

 covered with little short bristles, which, however, leave certain sym- 

 metrical raised linear patches bare; merus joints of legs clad in the 

 same way, and with two long bare stripes. 



Dorsal surface of carapace with a few low tubercles; one behind 

 the inner angle of the orbit has a sharp point anteriorly. 



Front, antennular and supra-orbital angles, and epistome all 

 acutely spinose. Front, between the antennules, narrow, contained 

 more than G.5 times in the fronto-orbital distance; just as wide as 

 long or very slightly wider than long, the length measured from 

 the hinder end to the sinus of the posterior tooth ; armed with four 

 spines (two on each side), and a row of spinules, which are very in- 

 conspicuous, just within and parallel to each side-margin. Three 

 spines on inner margin of orbit; the middle of the upper border is 

 also more or less serrate. Eyes large and reniform. Antero-lateral 

 border of carapace armed with four acute spines; the first is at the 

 angle of the orbit; the other three are smaller and subequal to one 

 another. 



The chclipeds vary according to age and sex, but arm and wrist 

 are always armed with spines; palm nearly smooth and nude, oval 

 and somewhat compressed, very deep in the adult male; fingers 

 short, blunt and hollowed at tip. Proximal upper surface of palm 

 with a short, ill-defined furrow, not more than half as long as upper 

 margin, and filled with pubescence. No patch of hair on inner sur- 

 face of palm. Merus joints of legs not extraordinarily elongated 

 or narrowed. Anterior border of merus joints armed along its whole 

 length with large and even spines; posterior border ends in a spine; 

 on the merus of the first two legs there is a second row of spinules 

 parallel with the anterior border; on the third merus this row is 

 indistinct; and on the fourth quite absent. 



Color. Carapace usually variegated or mottled with brown, pink- 

 ish flesh-color and salmon; there is generally a median longitudinal 

 stripe of bright pale blue; the legs arc banded with reddish-brown 

 and light pink. Ventral side of body pale blue; of legs pale pink. 

 (Verrill.) 



Measurements. Male (13828), total length of carapace 27.7, width 

 of same 2C, fronto-orbital width 17.1 mm. 



Habitat. Found on outlying rocks washed by the spray. Its body 

 and spiny legs look as if they had been ironed out. (Jarvis.) 



