XXI BODY AND LIMBS 505 
or “chelophkores,” the second or “ palps,” the third, the false or 
“ ovigerous ” legs, and the first of the four pairs of “ambulatory ” 
legs. The chelophores bear their chela, or “hand,” on a stalk 
or scape ; the ambulatory legs are constituted of three coxal joints, 
a femur, two tibial joints, a tarsus, and a propodus, with its claws, 
and with or without auxiliary claws. 
The Body.—The trunk with its lateral processes may be still 
more compact than in Pycnogonum, still more attenuated than 
in Nymphon. 
In a few forms (eg. Pallene, Ammothea, Tanystylum, Colos- 
sendeis) the last two, or even more, segments of the trunk are 
A B Cc 
Fic. 265.—A, Colossendeis proboscidea, Sabine, Britain ; B, Aimmothea echinata, Hodge, 
Britain ; C, Phoxichilus spinosus, Mont., Arctic Ocean. (The legs omitted.) 
more or less coalescent. In Rhynchothorax the cephalic segment 
is produced into a sharp-pointed rostrum that juts forward over 
the base of the proboscis. The whole body and limbs may be 
smooth, tuberculated, furnished with scattered hairs, or some- 
times densely hispid. 
The proboscis varies much in shape and size. It may be 
much longer or much shorter than tne body, cylindrical or 
tumid, blunt or pointed, straight or (e.g. Decolopoda) decurved ; 
usually firmly affixed to the head and pointing straight forwards ; 
sometimes (Hurycide, Ascorhynchus) articulated on a mobile stalk 
and borne deflexed beneath the body. 
Chelophores.—The first pair of appendages or chelophores 
are wanting in the adult Pycnogonum, Phowichilus, Rhyncho- 
thorax, and Colossendeis.' 
1 Hoek, Chall. Rep. p. 15, mentions a specimen of Colossendeis gracilis, Hoek, 
