188 GLOSSARY. 



Operculum (from the Latin for lid) Applied to the 

 horny or shelly plate which closes certain univalve 

 shells; also to the covering of the gills in fish, and 

 to the lids of certain eggs. 



Pectinated (Lat. pecten } a comb) Toothed like a comb, 



Serrated (Lat. serra, a saw) Toothed like a saw. 

 Sessile Attached by a base. 

 Silicious (Lat. sile x t flint) Flinty. 



Tuberculate "Warty, or covered with small, rounded 



knobs. 

 Testacea (Lat. testa, a shell) Molluscs with a shelly 



covering, as the Oyster, Whelk, &c. 



Univalve (Lat. unus, one ; valvce, doors) A shell com- 

 posed of one calcareous piece, as the Periwinkle. 

 Unibones The base of the shell, about the hinge. 



WJiorl The spiral turn of a shell. 



Zoology From the Greek word signifying to speak of 



animals. 

 Zoophyte (Gr. zoon, animal ; pliyton, plant) The lowest 



primary division of the animal kingdom, which 



includes many animals that are fixed to the ground, 



and have the form of plants. 



THE END. 



BALLANTYNE AND COMPANY, PRINTERS, EDINBURGH. 



