U. S. B. F.— Doc. 890. 



Plate IX. 



CONCHS. TOP, CHANNELLED CONCH OR WHELK, BUSYCON CANALICULATUM ; 

 CENTER, STRING OF CAPSULES CONTAINING EGGS OF KNOBBED CONCH; 

 BOTTOM, KNOBBED CONCH OR WHELK, BUSYCON CARICA. 



