﻿SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 127, PL. 18 



'M 



21 12 



20 



- 16 ^-^f^ 15 <-*-*Z-- 



ACANTHAMBONIA, CONOTRETA, PATERULA, RHYSOTRETA, SCAPHELASMA, 

 SPONDYLOTRETA, TORYNELASMA, UNDIFER1NA 



(SEE EXPLANATION OF PLATES.) 



