C A R I D E A. 563 



jointed. Outer maxillipeds reaching beyond apex of base of outer 

 antennae, pubescent. Tarsi of six posterior feet spinulous below. 



Plate 36, fig. 1 a, part of animal, enlarged ; b, inner antennae ; c, 

 hand of first pair; d, leg of second pair ; e, part of leg of third pair. 



From Gulf-weed (Sargassum natans) in the Atlantic, latitude, 

 36 07'; longitude, 71 36', August 24, 1838; also, latitude, 38 12' 

 north; longitude, 44 44' west, September 2, 1838; also, latitude, 

 4 07' north ; longitude, 20 43' west. 



Length of body, nine to twelve lines. Colour, yellow, with orange 

 dots ; sometimes a dirty yellow ; at base of thorax and in fifth joint 

 of abdomen translucent. Inner antennas with first joint one-third as 

 long as beak, and having an appressed tooth on outer margin ; longer 

 flagellum twelve to fourteen-jointed, and a few short hairs at apex of 

 each joint. Second pair of feet one-third longer than first pair ; hand 

 hardly longer than carpus. Scattered tufts of short hairs on joints of 

 six posterior legs. Caudal segment with two pairs of spinules on 

 outer surface. Some of the females had eggs under the abdomen. 



Differs from the tenuirostratus, which is attributed by Edwards to 

 the same localities in the Atlantic, in having no spine on the back 

 over the stomach region, and but one tooth on lower margin of beak. 



HlPPOLYTE EXILIROSTRATUS. 



Rostrum longum, omnino angustissimum, versm apicem non latior, 

 rectum, apice acutum, supra 4-spmosum, infra rectum, integrum. 

 Antennarum flagellum brevius internarum apicem rostri multum supe- 

 rans, multiarticulatum. Maxillipedes externi elongati, apicem basis 

 antennarum externarum multum superantes. Pedes antici perbreves, 

 manu subovatd, fere per ejus latus carpo articulatd. Pedes 2di Btiw 

 breviores, carpo 3-articuhito ; 6 sequentes nudiusculi, tarsia infra spi- 

 nulosis, spinulis apicis longis, reliquis brevissimis. 



Beak long, throughout very narrow, and not broader towards apex, 

 straight, acute at apex, above four-toothed, below straight and 

 entire. Shorter flagellum of inner antenna) many-jointed, reaching 



