110 GLOSSARY. 



Pectinibrdnchidta, having gills resembling a comb; the 



name of an Order of mollusks. 

 pedicle, a foot-stalk. 

 pellucida, transparent. 

 penultimate, the last but one. 

 peregra, a traveller. 

 periphery, applied to univalve shells, the outline of the 



body-whorl. 



peristome, the rim of the mouth of univalve shells. 

 perversa, turned the wrong way. 

 Physa, a bubble ; the name of a genus. 

 picta, painted, ornamented. 

 pictorum, belonging to painters. 

 Pisdna, named after the town of Pisa. 

 pisidioides, somewhat resembling a Pisidium. 

 Pisidium, resembling a pea ; the name of a genus. 

 Planorbis, a flat coil ; the name of a genus. 

 plication, a fold ; used for the thickened process which 



resembles a tooth in the mouth of a univalve. 

 pomdtia, having a lid or covering. 

 polymorpha, many-shaped. 



posterior, applied tobivalve shells, the thinner or sharper end. 

 pulchella, minutely beautiful. 

 Pulmonobrdnchidta, having gills resembling lungs; an 



Order of mollusks. 



Pupa, a doll or chrysalis ; the name of a genus. 

 purus, clear. 

 pusillum, small. 

 putris, stinking. 

 pygmcea, minute. 



pyramiddlis, shaped like a pyramid. 

 pyriform, pear-shaped. 



