HIPPOLYTE. 
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HIPPOLYTE. Leach. 
Antenna superiores breviores set is duabus : superiore infra excavata. 
inferiores corpoi’e longiores setacere decrescentes, squama adapicem externe unidenlata 
pedunculo anncxa. 
Palpi pediformes articulis tribus exsertis ; ultimo penultimo multo longiore apice spirruloso : 
primo longo a basi ad medium emarginato. 
Pedes decern : par anticum didactylum breve mquale : par secundum inmquale didactylum ; 
carpo multi-articulato : paria tertium, quartum et quintum simplicia (magnitudine sub- 
decrescentia) unguibus interne spinulosis instructa, 
Abdomen 6-articulatum ; articulo secundo utrinque infra antice et postice producto ; articulo 
tertio postice gibboso-producto. 
Caiula pentaphjdla ; processu medio spinis in lineas duas longitudinales digestis ; apice 
spinulifero. 
Generis Divisiones. 
* Pedipalpi articulo ultimo apice oblique truncato, antennce superiores basi spina 
instructa. Cauda lamella intermedia medio supra utrinque bi-spinosa. 
** Pedipalpi articulo ultimo fasciculato-piloso. Antenna superiores basi lamella spini- 
formi instructa. Cauda lamella intermedia supra utrinque 4 -spinosa. 
Superior antenme shortest, with two setae : the upper one excavated beneath. Inferior 
antennae longer than the body, setaceous, with a lamella at their base, which is unidentated at 
its apex externally. Pediform palpes with three exserted joints : the last much longer than the 
second : the first notched from its base to the middle. Legs ten ; the anterior pair short and 
didactyle; the second didactyle and unequal, with the Wrist many-jointed ; the other pairs 
simple, decreasing in size : the claws spinulose within. Abdomen six-jointed; the second 
joint on each side beneath produced ; the third joint behind gibbosely produced. Tail with five 
plates ; the middle one with spines arranged into two longitudinal lines. 
Divisions of the Genus. 
* Last joint of pediform palpi , with its apex obliquely truncated. Upper antenna with 
a spine at their base. Middle process of the tail above with four spines. 
** Last joint of pediform palpi with fasciculi of hairs. Upper antenna with a spini- 
f oimi lamella at their base. Middle p7-ocess of the tail with eight spines above. 
Montagu sent to me Hippolyte varurns, the type of this genus, as his Cancer astacus 
gibbosus , (Trans. Linn. Soc. ix. 91, t. 5, f. 4,) but he afterwards informed me, by letter, that 
his figure and description had been made from mutilated specimens, of what he had since 
ascertained to be a very distinct species, and requested me to take the earliest opportunity to 
correct his mistake. 
