562 CRUSTACEA. 



Genus HIPPOLYTE. 



1. Rostrum super carapacis dorsum non productum. 



Hippolyte ensiferus {Edwards). 



Gulf-weed, Atlantic, latitude, 36°-39° north; longitude, 71°-44° 

 west. 



The beak in the specimens seen by us, has either three or five teeth 

 at apex, the middle one longest, and the outer next longest. Length, 

 three-fourths to one inch. Colour, brownish j^ellow, with spots of 

 cerulean blue. Legs transparent ; excepting first pair and maxillipeds, 

 which are brownish yellow like the body. Tarsus spinulous on inner 

 margin. 



E. ensiferus, Edwards, Crustaces, ii. 374 ; Goodsir, Ann. Mag. Nat. Hist., 1845, 

 xv. 74 ; Krauss, S. Af. Crust., p. 56. 



Hippolyte acuminatus. 



Mostrum elongate acuminatum, subensiforme, apice parce recurvatum, 

 squama antennali non brevius, medio margine supra infraque uni- 

 dentato. Carapax supra oculum unispinosus. Antennarum fla- 

 gellum brevius internarum 5-Q-articulatum, apicem rostri non supe- 

 rans. Pedes antici perbreves, manu ovatd. Pedes 2di otiis breviores, 

 carpo 3-articulato. Maxillipedes externi basin antennarum exter- 

 narum superantes, pubescentes. Tarsi pedum 6 posticorum infra 

 spinulosi. 



Beak long, acuminate, subensiform, sparingly curved upward at 

 extremity, not shorter than basal scale of outer antennge, near 

 middle of upper and lower margin one-toothed. Carapax having a 

 spine above the eye, shorter flagellum of inner antennae five or six- 

 jointed, not reaching beyond apex of beak. Anterior feet very 

 short, hand ovate. Second pair shorter than third, carpus three- 



