WIIEEL-BEAKEKS. 



279 



because the fact helps to indicate tliat this class of 

 animals has its proper affinities with the Akticulata, 

 which has been denied by most naturalists. 



SKELETON WIIEEL-BEAnER. 



The form is curious. Elevated at the summit of a 

 long foot, consisting of three joints, Mdiich surmount 

 two unusually lengthened and slender toes, is a vase- 

 shaped lorica, which is three-sided. Its surface is 

 covered all over with minute points, very closely set, 

 so that it resembles shagreen ; besides Avhich it forms 

 immerous sharp ridges, which run across transversely. 

 Tlie two sides run off into thin lateral wings, which 



