574 CRUSTACEA. 



Length, ten lines. Colour, mostly opaque white, with a bluish, 

 yellowish, or flesh tinge ; antennas and scales, eyes, feet, and posterior 

 part of body from the fourth abdominal segment, transparent wine- 

 yellow, or burnt sienna, dotted with brown; extremity of caudal seg- 

 ment and lamellae, purple. Beak acute and the margin either side in 

 upper view slightly convex, then concave as it approaches the eyes, 

 and over the base of the ocular peduncle there is a low angle. In 

 profile the carapax a little longer than broad. Inner antennas with 

 the first joint very broad, and the outer apex triangular and acute ; 

 the two following joints quite short, not oblong, and the beak extending 

 about to the apex of the second ; exteriorly and from below the first 

 joint, a long curving tooth arises, which extends forward exterior to 

 the first joint, as far as base of second joint ; second and third joints 

 hairy within, shorter flagellum the stouter, and three-fourths as 

 long as longer or inner ; it is divided near apex ; inner flagellum 

 longer than carapax and hairy below. Second antennas about as long 

 as body ; basal scale quite broad ; a tooth below apex on outer side ; 

 apex projecting beyond the tooth, obtuse. Carpus of second feet 

 short, obconical; apical margin in part acutely dentate. Penult 

 abdominal segment acute on either side of base of caudal appendages. 

 Caudal segment slightly shorter than adjoining lamella, at apex trun- 

 cate and having six short spines, of which the second from either side 

 is the longest. 



GRAMINEUS. 



Corpus paulo depressum. Rostrum angustum, rectum, squamd basali 

 antennarum extemarum fere dimidio brevius, basin internarwn longi- 

 tudine cequans, supra k-dentatum, infra prope apicem \-dentatum. 

 Oculi magni. Pedes antici elongati, antennis internis non breviores. 

 Pedes 2di cequi, crassissimi, manu magnitudine portentosd, plu* 

 dimidio longiore quam carapax, inflatd, versus basin crassiore, digito 

 plus quadruple breviore quam manus, sublunato, extus integro, ar- 

 cuato. 



Body somewhat depressed. Rostrum narrow, straight, much shorter 

 than basal scale of outer antennas, and as long as base of inner, 



