GLOSSARY. 109 
nemordlis, inhabiting groves. 
Neritide. A Family of mollusks. 
Neritina. The name of a genus. 
nitens, shining. 
‘nitidulus, rather shiny. 
nitidus, shiny. 
nucleus, the tip of the spire of a univalve shell. 
O. 
oblonga, oblong. 
obscurus, hidden. 
obtusalis, blunt. 
obvoluta, wrapped up. 
ochracea, yellow. 
opérculated, furnished with an operculum. 
operculum, a covering or lid, A hardened plate attached 
to the foot of the animals of many univalves, which 
closes like a door or lid when the animal withdraws 
into the shell. 
Order. In natural history the subdivision of a Class, 
orvfice, a hole. 
ornata, ornamented. 
ovalis, oval. 
oviparous, producing eggs. | 
ovoviviparous, producing eggs which are hatched in- 
ternally. 
tie 
pallida, pale. 
Paludina, inhabiting marshes; the name of a genus. 
Paludinide. A Family of mollusks. 
palustris, living in marshes. 
