268 GLOSSAET. 



Cicatrix. The truncated portion of the apex of the basal joint 



of the antennas in some of the Longicorn Coleoptera. 

 Cilia. Minute hair-like bodies, which in the lower forms of In- 



vertebrata are organs of locomotion. 

 Cinclides (sing. Cinclis). Apertures in the walls of the somatic 



cavity of the Actinias for the emission of craspeda and acontia. 

 Cirri. Curled appendages on the feet, mouth, &c. in many ani- 

 mals. 



Clavicle. The collar-bone. 

 Clavus. The basal inner portion of the hemelytron in the He- 



miptera. 

 Cloaca. The common efferent opening in birds and many other 



animals. 

 Clypeus. The part, often very indistinctly marked off, to which 



the upper lip and its membrane is attached in most mandibu- 



late insects ; it is often called the epistome. 

 Cnidcs. See Trichocysts. 

 Coarctate. Applied to an insect pupa where it gives no indication 



of the parts it covers. 

 Coccoliths. Minute calcareous concretions formed at the end of 



the contractile processes of certain Radiolaria ; when they are 



massed together they are called coccospheres. 

 Coccyx. The anchylosed terminal tail-bones in birds and some 



mammals. 

 Cocoon. The outer covering, whether of silk or other material, 



of the pupae of certain insects. 

 Codonostoma. "The orifice of the umbrella in the Medusae, 



through which its cavity communicates with the external 



water " (Allmari). 



Coeloma. The general body-cavity. 

 Ccenenchyma. The common calcareous tissue which connects the 



scleroderrnic coralla of certain Actinozoa. 

 Coenacium. See Polypary. 

 Ccenosarc. " The common flesh or trunk which unites and binds 



together the polypites in a compound zoophyte " (HincJcs). 

 Colon. The large intestine opening into the rectum. 

 Columella. The axis of a spiral univalve. The centre of the thecas 



in a corallite. 

 Commensal. An animal that lives with but does not feed on its 



host. 



