221 



mella flattened at the base. The interior, as well as 

 the exterior of these shells, when uncoated, presents a 

 most brilliant pearly appearance of a golden or silvery 

 iridescence. Many of these species have their ex- 

 terior armed Avith spinous foliations, or are variously 

 sculptured; others are perfectly smooth. 



Turbo marmoratus Turbo diaphanus 



imperialis 



• • • • rugosus 



torquatus 



• • • • coronatus 



sarmaticus 



• • • crenulatus 



...... cornutus 



• • • • hippocastanum 



argyrostomus 



• • • • muricatus 



chrysostomus 



• • • littoreus 



radiatus 



• • • • ustulatus 



margaritaceus 



• • • • Nicobaricus 



setosus 



neritoides 



Spenglerianus 



retusus 



petholatus 



rudis 



undulatus 



obtusatus 



pica 



pullus 



versicolor 



caerulescens 





cancellatus 



cidaris 



costatus. 



