E. Billings on the structure of Crinoidea, Cystidea, ete. 237 
the contact of small animals (as Annelids, or stig ng 
and other small Crustaceans) with the arms, and have never ye 
seen the smallest cae vi te part’ of’ the ar ag to ¢ seize 
rey. Mo 
arms are so abuindicattipaft rite ete have not in ‘the sliateas de- 
gree that adhesive aoe which is possessed by the “ feet ” of 
the Ecuripea and Asrerrapa ; ; so that they are quite incapable 
of assisting in the act ‘of prehension, which must be accomplished, 
if at all, ‘either by the coiling-up of a_ single arm, or the 
folding-together of = bee arms. ow ave never seen such 
coiling up ; of an arm as could bring an object that might be in- 
cluded in it into neg near neighborhood ot the mouth; nor have 
seen the contact of small animals eet a single arm produce 
any movement of other arms towards the spot, such as takes 
arm, or by the consentaneous Gorare of all the arms together 
upon it, must be far too large to be received into themouth, which 
is of small size and not distensible Tike that of the Asrzroma.”* 
Farther on Dr. Carpenter says: 
“Tt was affirmed by M. Dujardin (Institut, No. “ye z dk 
that the arms are used for the’ ep gelled food in 
on the surface & which forms the floor of these eee yet I have 
distinctly seen such a eaphd passage of minute particles along 
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mouth, by the action of the fet cilia which (as I shall hereafter 
describe) Sringe various pane 8 of the internal wall of the alimentary 
would materia in the transmissio: 
minute 
ticles ae those portions of the ambulacral (?) furrows cS 
mediately lead toward it ; and it is, I feel satisfied, by the con- 
joint agency of these two eo poe that the alimentation of 
tedon is ordinarily the very numerous aoene s 
Arran the contents of whose digestive cavity I have exam- 
ined, I have never found any other than microscopic pobre: 
sd “Soares on the givorgeme ge 3 Physiology, and Development of Antedon (Com- 
Lamk. us.—Part I. By W Carpenter, a D., F.R.S. Philosophical 
Transactions of the Royal Society, vol. sly Part II. 1866 
