GLOSSARY. Ill 



E. 



radidta, rayed. 



radidtulus, slightly rayed. 



reflected, bent back. 



reticulated, like network. 



reveldta, unveiled, discovered. 



ringens, grinning like a dog, i.e. showing the teeth. 



rivicola, an inhabitant of streams. 



roseo-labidta, having a pink-coloured lip. 



roseum, pink. 



rostrdta, beaked. 



rotunda, round. 



rotunddta, rounded. 



rufescens, reddish. 



rufiloibris, having red lips. 



rugosa, wrinkled. 



rupestris, inhabiting cliffs. 



& 



scdlariformis, formed like a Scalaria (a spiral sea shell 



with projecting ribs which give the appearance of the 



divisions of a ladder, scala). 

 scar. " Muscular scars " are the depressions formed by 



the attachment of the muscles holding the parts of a 



bivalve shell together. 

 scutulum, a small shield. 

 secdle, a grain of rye. 

 septum (plural septa), a division. 

 sericea, silky. 



sessile, situated on a flat surface, not raised on a stalk. 

 shagreened, covered with small granules. 



