HIPPOLYTE. 
HIPPOLYTE. Leach. 
Antenne superiores breviores setis duabus: superiore infra excavata, 
inferiores corpore longiores setacew decrescentes, squama ad apicem externe unidentata 
pedunculo annexa. 
Palpi pediformes articulis tribus exsertis ; ultimo penultimo multo longiore apice spinuloso : 
primo longo a basi ad medium emarginato. 
Pedes decem: par anticum didactylum breve equale: par secundum inaquale 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. 
Cauda pentaphylla; processu medio spinis in lineas duas longitudinales digestis ; apice 
spinulifere, 
Generis Divistones. 
* Pedipalpi articulo ultimo apice oblique truncato, antenne superiores basi spina 
instructe. Cauda lamella intermedia medio supra utrinque bi-spinosa. 
** Pedipalpi articule ultimo fasciculato-piloso. Antenne superiores basi lamella spini- 
Jormi instructe. Cauda lamella intermedia supra utrinque 4-spinosa. 
Superior antennz shortest, with two sete: the upper one excavated beneath. Inferior 
antenne 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 tts apex obliquely truncated. Upper antenne 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 antenne with a spini- 
form lamella at their base, Niddle process of the tail with eight spines above. 
Montagu sent to me Hippolyte varians, the type of this genus, as his Cancer astacus 
eibbosus, (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. 
