MAIOIDEA. 93 



gracillimis, divaricatis. Articulus antennarum externarum lmus 

 latus, ywrce longior quam latior, apicem processu spiniformi armaius. 

 Orbita infra supraque sinu rotundato inUrrupta, dente prceorbitali 

 acuto. Pedes toti graciles. 



In the feet, and in the outer antennae concealed by the beak, near 

 Chorilia. Carapax long ovate, tumid, sparingly armed; horns of 

 beak long, very slender, divaricate. First joint of outer antennae 

 broad, slightly longer than its breadth, armed with a spiniform pro- 

 cess at apex. Orbit below and above interrupted with a rounded 

 sinus, praeorbital tooth acute. Feet all slender. 



Lahaina ovata. 



Carapax vix spinosus, subvillosus, papillis postero-dorscdibus recti flexis, 

 spina postero-laterali parmdd, cdidque posticd ; rostri cornubus corpore 

 paido brevioribus, tenuibus, valde divaricatis, margine orbitali supe~ 

 riore late fisso, spina anticd brevi acuta et lateraliter unidentatd. 

 posticd prominenter rectangidatd non acuta. Articulus antennarum 

 externarum lmus apice spinigerus. Pedes tenues, longi, manu peran- 

 gustd, nudd. 



Carapax hardly spinous, only a small postero-lateral spine, and ano- 

 ther behind; surface subvillous- or papillose, papillae of posterior 

 half of carapax bent at a right angle ; horns of beak very long (a 

 little shorter than rest of body), slender, much divaricate. Breadth 

 across the eyes about half greatest breadth. Upper margin of orbit 

 with a broad, rounded sinus ; anterior spine short, acute, and hav- 

 ing a tooth on its outer side over the eye ; posterior part of orbital 

 margin salient, not acute, rectangulate. First joint of outer an- 

 tennae having an elongate spine at apex. Pterygostomian margin 

 armed with a long, curved spine or horn, and another short spine. 

 Feet slender, long ; hand very narrow, nude, fingers contiguous. 



Plate 2, fig. 1 a, male, enlarged three diameters ; b, orbital margin 

 and eye (1, base of beak ; 2, apical spine of base of outer antennae ; 3, 

 praeorbital spine ; 4, eye ; 5, posterior part of orbit) ; c, under view of 

 head; d, hand; e, papilla of posterior half of dorsum ; /, papilla of the 

 apex of the third joint of one of the legs. 



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