GLOSSARY 193 



Branchiostegite : a paired lateral fold of the body-wall in crustaceans, 24. 

 Brood-sac: a chamber in which the eggs develop in certain crustaceans; 



sow-bug, 41; amphipod, 43; Daphnia, 51. 

 Bud : an outgrowth of an animal which becomes a new individual ; Bugula, 



80; Hydra, 147; hydromedusan, 150, 155. 



Calcareous: formed of carbonate of lime. 



Capsulogenous glands: glands of uncertain function but which may aid in 



the secretion of the cocoon in the earthworm, 63. 

 Carapace: the shell covering a portion or all of the cephalothorax in 



crustaceans ; crayfish or lobster, 23; crab, 36 ; larval decapods, 45. 

 Cardo: the basal division of the maxilla in insects, 11. 

 Cellulose: the woody cell-wall of plant cells; Molgula, 125; Euglena, 173. 

 Cephalothorax: a body-division formed by the fusion of the head and the 



thorax in arthropods ; crayfish or lobster, 22 ; crab, 36 ; larval 



decapods, 45 ; copepod, 47. 



Cercus : a paired projection at the posterior end in certain insects, 8. 

 Cheliped : the large grasping claw in many crustaceans, 24. 

 Chitin: a hard and very resistant substance present in the cuticula of 



arthropods. 

 Chloragogue cells : glandular cells surrounding the digestive canal of the 



earthworm, 65. 



Chlorophyll: the green coloring matter of plants, 172. 

 Chromatophores : pigment bodies; squid, 113; Hydra, 146. 

 Cilia: the numerous vibratory projections on the outer surface of certain 



animals; planarian, 70; Paramecium, 165; Vorticella, 168: and of 



certain organs; Bugula, 80; mussel, 88; clam, 98. 

 Cirrus : a filamentous, sensory appendage of annelids, 56, 57 : a protrusile, 



copulatory organ of flatworms, 71. 

 Clitellum: a thickened glandular region on the earthworm which secretes 



the cocoon, 62. 

 Cloaca : a tubular or sac-like space which receives the discharge of various 



organs; planarian, 71; tapeworm, 76; mussel, 86 ; clam, 96; snail, 111. 

 Clypeus: a median sclerite in the face of insects just back of the upper 



lip, 10. 

 Cnidoblast : a stinging cell in Cnidaria which contains the nematocyst ; 



Hydra, 147 ; tubularian, 151 ; campanularian, 157. 

 Cocoon: a case containing one or more developing animals, 67. 

 Caecum: a sac-like appendage of the digestive tract; grasshopper, 13; 



starfish, 135. 



