INACHUS. 
CANCER. Pennant, Herbst, Gmelin. 
INACHUS. Fabricius, Leach. 
MAJA. Bosc, Latreille. 
Antenne externe distantes, corpore quintuplo breviores, setacew, ante oculus ad rostri latera 
inserte, articulis tribus basilaribus reliquis distincte crassioribus. 
Pedipalporum geminorum externorum caulis mterni articulus secundus ad apicem internum trun- 
catus ad insertionem palpi elongato-subcenici, triarticulati. 
Pedum par anticum majus, didactylum, equale (Maris corpore duplo longius, manu ovata; 
FEMIN© corporis longitudine manu subfiliformi: paria reliqua longissima tenuissima; pari 
secundo longiore, crassiore; tertio deinde, quarto postea, longioribus, quinto breviore. 
Ungues antici longiores subcurvati, secundi breviores magis incurvi, tertii et quarti secundis 
breviores, aequales, arcuati. 
Testa subtriangularis parce spinosa, antice rostrata, spina utrinque ad latera oculos retractos 
protegente; (orbitam quasi duplicem efformante). 
Oculi distantes, pedunculi mediocris basi vix crassiores. 
Abdomen 6-articulatum, longitudinaliter tuberculato-subcarmatum, articulo ultimo longiore: 
Maris articulis primo latiore, secundo breviore, angustiore, tertio primo latiore, quarte 
paululum angustiore, quinto et sexto abrupte angustioribus, hoc ad basin subqua- 
drato ad apicem abrupté angustiore arcuato : 
Fein articulis primo et secundo equalibus, angustioribus, hoe cum reliquis conjunctis 
caudam latam, ovatam efformantibus. 
External antenne one-fifth of the length of the body, situated at a distance from each other 
on each side of the rostrum before the eyes, with the three first joints distinctly thicker than the 
others; second joint of the internal peduncle of the external double palpi truncated at its internal 
‘apex, for the insertion of the three-jointed elongate-conic palpus. Anterior pair of feet didactyle 
and large, equal in size and form (of the male twice the length of the bedy with an oval hand ; 
of the female the length of the body with a nearly filiform hand): other legs very long and slender, 
second pair longest and thickest, the second shorter, the third still shorter, the fourth shortest. 
Anterior claws long, slightly curved; third shorter, and more curved; fourth and fifth still 
shorter, arcuate and equal. Shell somewhat triangulate with few spines, anteriorly rostrated, 
with a spine on each side protecting the eyes when “retracted, forming as it were a double orbit. 
Eyes distant, scarcely thicker than the peduncle, which is of a moderate length. Abdo- 
men six-jointed, with a kind of longitudinal tuberculated carina, the last joint longest; first 
joint in the male broader, the second shorter and narrower, the third broader than the first, the 
fourth a little narrower, the fifth and sixth abruptly narrower than the latter, nearly quadrate at 
the base, with the apex abruptly narrower and arcuate: the two first joints in the female equal 
and narrow, the latter joint with the others forming a broad ovate tail. 
INACHUS DORSETTENSIS. 
Tas. XXII. Fie. 1, 2, 3, 4, 5, et 6. 
I. Rostro brevi, emarginato, clypeo infra in spinam, producto ; testa antice tuberculis quatuor 
parvis, «qualibus, transversim dispositis; deinde spinis tribus (antica dorsali validiore) ; 
postea spinis tribus validis, acutis (media sepius majore, acutiore) lineam subrecuryare 
delinientibus; margine postico tuberculis duobus distantibus obsoletis. 
