168: GLOSSARY. 
dextrorsa, turned to the right. 
adidphana, transparent. 
ailatatus, 
ailatata, 
aisciformis, circular, quoit-shaped. 
} expanded, 
dorsal, pertaining to the back. 
dubia, doubtful. 
ecdrinata, with no keel. 
edéntula, toothless. 
efascidta, having no band or stripe. 
élegans, elegant. 
elongdta, lengthened. 
epidermis, the thin skin covering shells. 
épiphragm, a film secreted by the animal to cover the 
mouth of the shell. 
epizona, marked above (the periphery). 
equilateral, having equal sides. 
ericctorum, inhabiting heaths. 
exdlbida, whitish. 
excavdta, hollowed out. 
exigua, small. 
fascidta, banded. 
Silament, thread. 
Jtémmea, with flame-shaped markings. 
Jlavéscens, yellowish. 
