LIST OF GENERA. 



289 



Phasianella. Phasianus, a pheasant - - gjfl 



Pholadomia. Pholas and mya - - -66 



Pholas. Pholeo, Gr., to lie hid in a cavity - 61 



Phyllidea - . . _ - 141 

 Phylliroe - 



Physa. A bubble - - . . - 183 



Pileopsis. Pileos, a bonnet - 154 



Pinna. The fin of a fish- - . - 112 



Placuna. Placous, Gr., a cake - - - 129 



Placunanomia. Placuna and anomia - - 130 



Plan axis. Plana, flat, and axis - - - 216 



Planorbis.. Plana, flat ; orbis, an orb - - 182 

 Pleurobranchus. Pleura, Gy., the side; branches, 



the gills - - - - - 147 



Pleurotoma. Do., and tome, a slit - _ 221 



Plicatula. Plicatus, of a fold - - - 125 

 Pollicipes. Poller, a thumb's breadth ; pons, a 



foot - - - - - - 43 



Pneumodermon - - - _ - 138 



Psammobia. Psammos, sand - - - 80 



Pteroceras. Pteron, a wing ; ceras, a horn - 231 



Pterotrachea. Do., and trachea - . 276 



Pupa. A chrysalis - - _ - 172 

 Purpura. The shell-fish from which the purple 



colour is taken - - _ - 237 



Pyramidella. A little pyramid - - - 203 



Pyrgona. Pyrgos, Gr., a tower - - - 39 



Pyrula. A little pear - 224 



Ranella. Rana, a frog - 227 



Ricinula. Resembling the seed-vessel of the 



Ricinus _____ ^37 



Rtssoa. From M. Risso - 209 

 U 



