GLOSSARY. Kz 
Or 
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. pallens, ) 
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pallido-dorsalis, pale on the back. 
Paludestrina, inhabiting marshes. 
palustris, living in marshes. 
paroula, small. 
pdtula, extended, \ 
pedicle, a foot-stalk. 
Pelecypoda, axe-footed ; another term for bivalves. 
pellucida, transparent. 
penultimate, last but one. 
peregra, traveller. 
periphery, the circumference of the body-whorl of a uni- 
valve shell. 
péristome, the rim of the mouth of a univalve. 
pervéersa, turned the wrong way. 
Physa, a bubble. 
picta, painted, ornamented. 
pictorum, belonging to painters. 
fisdna, named after the town of Pisa. 
pisidioides, resembling a Pistdium. 
Fisidium, resembling a pea. 
Planorbis, a flat coil. 
plicdtion, a fold ; the thickened process which resembles 
a tooth in the mouth of a univalve. 
plimbea, \eaden coloured. 
fomdtia, having a lid or covering. 
