110 GLOSSARY. 
Pectinibranchiata, having gills resembling a comb; the 
name of an Order of mollusks. 
pedicle, a foot-stalk. 
pellicida, transparent. 
penultimate, the last but one. 
peregra, & traveller. 
periphery, applied to univalve shells, the outline of the 
body-whorl. . 
peristome, the rim of the mouth of univalve shells. 
pervérsa, turned the wrong way. 
Phijsa, a bubble; the name of a genus. 
picta, painted, ornamented. 
pictorum, belonging to painters. 
Pisana, named after the town of Pisa. 
pisididides, somewhat resembling a Pisidium. 
Pisidium, resembling a pea; the name of a genus. 
Plandrbis, 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. 
pomatia, having a lid or covering. 
polymorpha, many-shaped. 
posterior, applied to bivalve shells, the thinner or sharper end. 
pulchélla, minutely beautiful. 
Pulmonobranchidia, having gills resembling lungs; an. 
Order of mollusks. 
Pupa, a doll or chrysalis; the name of a genus. 
purus, clear. 
pusillum, small. 
putris, stinking, 
pygmeéa, minute, 
pyramidalis, shaped like a pyramid. 
pyriform, pear-shaped. 
