288 



GASTEROPODA. 



FlG. 227. PHYLLIDIA. 



ORDER CYCLOBRANCHIATA.* 



In this order the gills consist of a series of laminae 

 or pyramidal appendages, extending quite round 

 the body beneath the edge of the mantle (Fig. 228). 

 It embraces 



The Limpets (Patellae), the appearance of which is 

 well known to every sea-side visitor. 



FIG. 228. LIMPET. 

 * KUK\OS, cuclos, a circle ; branchiae, gills. 



