578 CRUSTACEA. 



ing the species from those of Palsemon, although they may generally 

 be distinguished by their more salient eyes, hardly compressed and 

 rather longer body, and the inner antennae with two flagella. The 

 slender, nearly straight tarsi separate them from Harpilius or (Edipus. 

 The lateral process of the mandibles has a broad summit, molar-like, 

 usually, as in Palaemon, and not bidentate as in Harpilius and 

 (Edipus. 



The name of the genus alludes to its being in close relationship to 

 genera on either side, from y % ,FTei, relationship. 



ANCHISTIA GRACILIS. 



Rostrum tenue, rectum, acutum, longum, squama antennali fere bre- 

 vius, basi antenntirum internarum lonyius, supra Q-dentatum, dente 

 postico inter oculos, infra unidentatum. Antennarum internarum 

 articuli 2du$ Stiusque perbreves. Fades 2di lonyi, carpo perbrevi, 

 apice acuto, brachio apice externo acuto, manu subcylindricd, digitift 

 manu fere triplo brevioribus. 



Beak slender, straight, acute, hardly shorter than scale of outer an- 

 tennae, much longer than base of inner pair, six-toothed above, 

 posterior tooth situated between the eyes, unidentate below. Second 

 and third joints of inner antennae very short. Feet of second pair 

 long, carpus very short, acute at apex, arm acute at outer apex? 

 hand subcylindrical, fingers nearly one-third as long as hand. 



Plate 37, fig. 5 a, animal, much enlarged ; b, outline of beak ; c, 

 mandible ; d, extremity of terminal process ; e, maxilliped of first 

 pair; /, maxilliped of second pair; g, one of the setae of same; /*, 

 outer maxilliped; i, last joint of same, more enlarged; k, under view 

 of carpus and arm of second pair of feet; Z, extremity of third pair; 

 m, one <x? the setce of the basal scale of outer antenna). 



Soolo<- Sea. 



Length, eight or nine lines. Carpus of second pair of feet not 

 one-fourth as long as hand, and about half as long as arm. Mandibles 

 ru'.lior slem'er, with extremity of terminal process five-toothed, the 



