326 GLOSSARY. 



Crustaceoiis, hard and like a crust. 



Flaccid, soft when collapsing on removal from the 



water. 

 Gelatinous, jelly-like, consisting of gelatine. 

 Rigid, harsh, not collapsing on removal from the 



water. 



The structure is termed — 

 Areolated, when the cells are marked out into 



regular spaces, and resemble mosaic-work. 

 Cellular, consisting of cells placed laterally as in a 



honeycomb. 

 Filamentous, when formed of a string of simple 



cells placed end to end. 

 Fibro-cellular, when the cells are firm and elongated, 



and strung together into threads or filaments. 

 Reticulate, when marked like net-work, or formed 



of large, flat, many-sided cells. 



