Og AMBULATORY LEGS 509 
if we include, the terminal claw. They vary from a length about 
equal to that of the body (Pycnogonum, Rhynchothorax, Ammothea) 
to six or seven times as much, perhaps more, in Vymphon and 
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Fic. 273.—Nymphon strémii, Kr. Male carrying egg-masses on his ovigerous legs. 
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Colossendeis, the fourth, fifth, and sixth joints being those that 
suffer the greatest elongation. The seventh joint, or tarsus, 1s 
Fig. 274.—Terminal joints (tarsus and propodus) of legs. 1, Chaetonymphon hirtum, 
Fabr. ; 2, NV. strémii, Kr. ; 3, Nymphon brevirostre, Hodge ; 4, Ammothea echinata, 
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 
