184 GLOSSARY. 



Cirri (p. 64). Fleshy unjointed threads. In the 

 Cirripedia (p. 168), the term means curled, jointed ? 

 fringed limbs. 



Compressed. Flattened sidewise. (See depressed). 



Convoluted (p. 42). Rolled up, like a scroll. 



Corallum (p. 20). The solid parts of a Polype, 

 whether external or internal. 



Coriaceous (p. 32). Resembling leather. 



Deciduous (p. 18). Falling off at a certain period. 



Depressed. Flattened from above. A Thornback is 

 depressed, a Dory compressed. 



Dextral (p. 9o). In shells — turning from east to 

 south. 



Dickotomous (p. 47). Dividing into two branches, 

 each of these again into two, and so on. 



Ditrematous (p. 26). Having two openings — the 

 mouth and the vent separate. 



Dorsal (p. 63). Belonging to the back, or upper 

 side. 



Entire (p. 62). Not notched, or lobed at the margin. 



Epidermic (p. 34). Belonging to the outer skin 

 (epidermis). 



Evertile (p. 96). Capable of turning inside-out. 



Extensile (p. 19). Capable of lengthening. 



Filament (p. 50). A slender thread. 



Fissures (p. 81). Slits in the head of certain worms, 

 for breathing. 



Frontal (p. 80). Placed on the front. 



Gelatinous (p. 8). Resembling jelly. 



Gregarious (p. 19). Associating in numbers together. 



Homogeneous (p. 22). Of but one substance. 



Linear (p. 34). Very long and slender, like a line. 



