144 THE VOYAGE OF H.M.S. CHALLENGER, 
this opinion may be advanced that—at any rate as far as | know—hitherto no specimen 
of one of the known species of Colossendeis has been caught with egg-masses on its 
ovigerous legs. Considering that they are not the eggs of the Colossendeis itself, it 
becomes almost impossible to form an opinion as to the animal they belong to. Among 
the gastropodous molluscs numerous forms are known, which construct egg-capsules, and 
attach them to foreign bodies. Perhaps the present capsules belong to an animal of that 
group. That the long legs of our animals may easily be mistaken by other animals for 
dead bodies is shown, I believe, by the fact that numerous other animals, which cannot be 
considered as parasites, and which, as a rule, are found on stones, shells of molluscs, 
carapaces of crabs, &c., fix themselves on these legs. So a small sponge and a poly- 
zoon are on Nymphon brachyrhynchus, a stalk-like process most probably of a tubularian 
polyp is found on the leg of a Colossendeis ; a species of Scalpellum is extremely numerous 
on the legs of Nymphon robustum, Bell. Of the numerous specimens of this species col- 
lected in Barents Sea, which I have investigated, there is not a single one with these 
ectoparasites. But on the other hand, they are very common on the hundreds of speci- 
mens of this species which were obtained by the “ Knight-Errant.” Professor G. O. Sars 
enumerates in his two latest papers on the Crustaceans of the Norwegian Expeditions 
numerous species of Scalpellum, found at higher northern latitudes, but he does not 
mention that they are found on the legs of the most common Pyecnogonid of the North 
Atlantic and North Polar Sea. Moreover, a preliminary comparison of this species of 
Scalpellum shows differences with those described. I therefore believe it to be a new 
one, and wish to name it Scalpellwm nymphocola. 
