GLOSSARY. 391 



Didymous, in pairs. 



Disc, the surface with the margin or the flat base of adherence. 



Dissepiment, a partition. 



Distal, opposed to anteal. 



Distichous, placed in two opposite rows. 



Divaricate, spreading out widely. 



Dredge, a drag-net for taking mollusca, zoophytes, etc. 



EcUnated, set with spines, or bristled like a hedgehog. 



Edentulous, toothless. 



Elliptical, oval, but having the longitudinal diameter twice the 



length of the transverse. 

 Emarginate, notched on the margin. 

 Ensiform, shaped like a sword. 

 Epidermis, the outer covering, or scarf-skin. 

 Erose, irregularly notched, as if gnawed. 

 Everted, turned outward. 



Falcate, bent like a scythe. 



Fasciculate, tufted and level-topped. 



Fauna, the animals peculiar to any country. 



Filiform, thread-shaped. 



Fimbriated, fringed. 



Fissure, a little cleft. 



Fistular, like a pipe. 



Flabelliform, fan-shaped. 



Flex-uous, bending, gently winding. 



