PROCESSA. 
Antenne superiores breviores setis duabas in eadem, fere linea horizontali insertis, seta interiore 
longiore: pedunculus 3-articulatus articulé primd longiore; ultimd breviore. 
Inferiores corpore longiores, setacee decrescentes, squamd ad apicem externe unidentat6d 
pedunculo annexa. 
Palpi pediformes articulis quatuor exsertis, secundd longissimo ad basin interné subabrupte 
emarginato. 
Pedes decem; par anticum pede und didactylé, alterd monodactylo; par secundum inequale, 
didactylum tenue, hdc longissimo carpd cubitéque multi-articulatis, illd breviore carpd 
multi-articulat6: paria tertium, quartum et quintum unguibus acutis, simplicibus instructa. 
Abdomen 6-articulatum, segmento secundo infra anticé et posticé producto. 
Cauda pentaphylla; processibus externis bipartitis parte exteriore mobili. 
Superior antenne shortest, with two sete placed in nearly the same horizontal line; the 
interior seta largest: peduncle with three joints, the first of which is the largest, the third the 
shortest: inferior antenne setaceous and larger than the body, furnished at their base with a 
large scale, having its external point unidentate. Pediform palpi with four exserted joints; 
the second joint very long, somewhat abruptly emarginate at its base internally. Legs ten; 
anterior pair with one leg didactyle, the other monodactyle; second pair unequal, one being 
very long, having its wrist and fore-arm composed of many joints, the other having the 
wrist only jointed: third, fourth, and fifth pair furnished with sharp simple claws. Abdomen 
six-jointed, the second segment beneath anteriorly and posteriorly produced. Tail composed of 
five plates; the external plate composed of two parts, separated by a hinge-joint. 
The discovery of the species constituting this most curious and interesting genus, is the 
result of Montagu’s indefatigable labors. The circumstance of the legs on different sides of 
the same animal being different in length is not an uncommon occurrence in several crustaceous 
genera, but this is the first instance in which the legs ef opposite sides have been found to differ 
in essential structure. 
