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 





FIG. 20G. LATERAL VIEW OF TYPE SPECIMEN OF ASTEROMETKA MIRIFICA. 









the Comasteridse is probably to be found in the pectinate pedicellariae of certain 

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



