594 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



interzooccial 

 avicularium 



"frontal avicularlura 



H -85 



Deep zooccium-' _-' 



ovicell-" 

 superficial 



incomplete zooccium--- 



^incomplete zooecium 

 "/^' -..oriented zooecia 

 ^ avicularian mandible 



N "* 

 Fid. 176. Anatomical structure of the family Celleporidae Busk, 1852. 



