

MONOGRAPH OF THE EXISTING CRINOIDS. 



271 





It is a matter of great interest that where cirri occur they are definitely seg- 

 mented, and also appear in definitely localized positions, just like the limbs of the 

 artliropods taken as a whole, to which, as structures, they are allied. They also 

 resemble the limbs of arthropods in being specialized anteriorly, though the proximal 



FlO. 312. 



Fro. 313. 



FlGS. 312-313. 312, ClKEI FROM A SPECIMEN OF ANTEDON BIFIDA FBOM ENGLAND (CAMERA LUCIDA DRAWING BY THE AUTHOR). 

 313, CIRRI FROM A SPECIMEN OF ANTEDON MEDITERRANEA FROM NAPLES (CAMERA LUCIDA DRAWING BY THE AUTHOR) 



cirri do not differ much from the distal and earlier; it is possible, however, to regard 

 the elongate marginal cirri which never assume the adult characters, sudi as are seen 

 in the species of Heliometra, Promachocrinus , Anihometra, Florometra or Solanometra 

 for instance, as tactile organs, distantly suggesting the auteuuse of the arthropods. 



