MONOGRAPH OF THE EXISTING CRINOIDS. 



143 



Comblike structures of independent origin are of frequent occurrence and 

 wide distribution in the animal kingdom. The closest parallel to the combs in 



-06. — Lateral view of tipe si-ecimen of Astero-metra mirifica. 



the Comasteridaj is probably to be found in the pectinate pedicellaria; of certain 

 starfishes of the family Benthopectinidse, while the individual teeth are closely 



