CRUSTACEA. 



reaching beyond apex of arm of second pair, and much beyond apex 

 of beak. Tarsus slender and but little curved. 



ANCHISTIA ENSIFKONS. 



Rostrum ensiforme, valde recurvatum, squama antennaU non longius, 

 apice bi/tdum, supra Q7-dentatum, infra paulo dilatatum et 3-den- 

 tatum. Carapax super orbitam spind armatus, infra orbitam spinis 

 duabus in eddem lined horizontali. Antennce internee rostrum parce 

 superantes. Rdes antiei graciles, apicem carpi 2di non attingentes ; 

 2di crassiusculi, subcylindrici, per carpum manumque rostrum super- 

 antes, carpo longo, apice inermi, obtuso, manu prcelongd, tineari, digitis 

 dimidio manus paulo brevioribus. Pedes 6 sequentes gracillimi, longi, 

 fere nudi. 



Beak ensiform, much reflexed, not longer than basal scale of outer 

 antennae, bifid at apex, above six or seven-toothed, below somewhat 

 dilated and three-toothed. Carapax above line of orbit bearing a 

 spine, below orbit two spines in nearly same horizontal line. Inner 

 antennae extending but little beyond apex of beak. Anterior feet 

 slender, not reaching to apex of carpus of second pair. Second pair 

 rather stout, subcylindrical throughout, exceeding the beak by the 

 carpus and hand, carpus long, not armed or acute at apex, hand 

 very long linear, fingers not half as long as hand. Six following 

 pairs very slender, long, nearly naked. 



Plate 38, fig. 1 a, animal, enlarged five diameters; b, inner antennae 

 and eye, more enlarged ; c, outer antennae, ibid. ; d, d', mandible in 

 different positions, ibid. ; e, second pair of maxillipeds, ibid. ; /, outer 

 maxilliped, ibid. ; g, extremity of leg of third or fourth pair. 



Straits of Balabac, north of Borneo. 



Length, eight to nine lines ; a female, with eggs under the abdo- 

 men, eight lines. The form of the beak and of the body is wholly 

 that of a Palaemon. Yet the mandible has no palpus, and the inner 

 antennae have properly but two flagella, one being only slightly bifid 

 at tip. 



