MONOGRAPH OF THE EXISTING CKINOIDS. 



199 



s 



FlO. 128.— A SPECIMEN OF I'EOISOCBINCS Bi;BEBBmUS FROM THE PHn-nTlXE ISIAKPS, SnOWISO THE DISTAL roBTlON OF 

 THE COLUMN, XnOCOU NOT THE END (o), THE CENTRAL PORTION OF THE COLUMN (6), AND lUE PROXIMAL PORHON OF IBB 

 COLUMN AND lUE CROWN (c). 



