AMBULATORY LEGS 



509 



if we include, the terminal claw. They vary from a length about 

 equal to that of the body {Pycnogonum, Bhyncliotlwrax, Airimotliea) 

 to six or seven times as much, perhaps more, in Nym'plwn and 



Fig. 273. — Nymphon strOmii, Kr. Male carrying egg-masses ou his ovigeroiis legs. 



Colosse/ideis, the fourth, fifth, and sixth joints being those that 

 suffer the greatest elongation. The seventh joint, or tarsus, is 



Fig. 274. — Terminal joints (tarsus and propodus) of legs. 1, Chaetonym2}hon kirtum, 

 Fabr. ; 2, JV. stromii, Kr. ; 3, Nymjjhonhremrostre, Hodge ; 4, Aminothea echimdu, 

 Hodge ; 5, Ascorhynchus abyssi, G.O.S. (All after Sars.) 



usually short, but in some Nymphonidae is much elongated ; 

 the eighth, or propodus, is usually somewhat curved, and usually 

 possesses a special armature of simple or serrate spines. The 



