Sii/i 





^Im 



GIANT WHELKS. OR PEAR CONCHS, AND EGG RIBBON 



Left-handed Whelk, Fulgur perversa. 



Egg Ribbon of F. canal iatlatus. Several embryos develop in each capsule. 



Operculum of Fulgur perversa. 

 Channeled Whelk, Fulgur canalictdaius. 



