ACH/EUS. 
Antenna exieime distantes selacete ante oculos ad rostri latcra insert®, articulis duobus basi- 
“V dlstincte crassioribus : secundo primo duplo longiore at tenuiore : articuiis 
Pedipalpiexlemi cauli interne articulo primo apice interiore valde producto : articnlo secundo 
subtriangulato ; ang^lis rotundatis. 
Pedum par anticum majus didactylum; par secundum unguibus rectis ; par tertium unguibus 
gradallm arcuatis ; par, a qua, turn et quintan, unguibus abrupte et valde curvatis 
Jesta subtriangularis parce spinosa, antice breviter rostrata : rostro fisso 
OcuH distantes (pedunculi articulo secundo antice unituberculato) in orbitas baud retractiles 
Abdomen 6-articulatum tuberculato-subcarinatum. 
External antenna wide apart, setaceous, inserted on the sides of the rostrum before the eves • 
the two firs jo, nts distinctly thicker than the others; the second joint twice as long as the tot' 
and more slender ; the other joints elongate Tim n Y t Pvn 1 r i 3 
. ; u »»o ale - 1 he external pedipalpes with interior apex of 
d,c , totjo.nt very much produced j the second joint somewhat triangular ; the angles rounded. 
wither d H 7 T SeSl T c aCtyle ■' “ CC0 "‘ l l’ air Wil11 stra 'gltt claws ; the third pair 
SMI subb ^ 7 ■' 0 " , lh and mh Pam Wilh llK daws abruptly and much curved. 
Shell subt, angular, with few spmes, anteriorly terminated by a short fissured rostrum. Eyes 
distant with the secondjoint unituberculated in front) not retractile within the orbits. Abdomen 
six-jointed, with a tuberculated keel. 
The situation of Achiem, of which one species only lias hitherto been discovered is inter 
mediate between /nor/, us and Lcplopoiia : it is the only known genus of the Braclwura 
excepting the latter, whose eyes are not retractile. ' 1 
ACIEEUS CRANCHII. 
Tab. XXII -c. 
A. testa medio luberculis duobus ; ordine 1, 1, et inter oculos lineis duabus elevatis. 
e„e F ' S ' A, l r"c, C r" Cb '' I EM m “ S " al - S - P«Upalpus externus auctus. 3. Antenna 
" ,101 aucta. 4. Oculi art, cuius secundus amplificatus. 6. FtEMre.r abdomen auctum. 
Mr, John Crunch discovered, by dredging off Falmouth, a single specimen of the female of 
ms curious species, which from the developement of its abdomen is certainly adult. 
hether the tubercle in the second joint of the peduncle of the eyes, be a specific character 
only, oi common to the whole genus, is extremely uncertain. 
The legs are very hairy. 
