Appendix 823 



Chloroplast (Chloroplistid) (klo' ro plast) (Gr. kloros, green; plastos, mouded), 



body containing chlorophyll. 

 Choanocyte (ko' a no sit) (Gr. choana, funnel; kytos, cell) {see Collar cell). 

 Chondriosonie (kon' dri o som) (Gr. chondros, cartilage; soma, body), feebly 



refractive body in the protoplasm. 

 Chondroskeleton (kon dro -skel' e tun) (Gr. chondros, cartilage), cartilaginous 



skeleton. 

 Chordata (kor-da'ta) (L. chorda, string or chord), animals having a temporary 



or permanent dorsal skeletal notochord. 

 Chorion (ko' ri on) (Gr. chorion, membrane), outer membrane enveloping the 



mammalian fetus and enclosing the amnion. 

 Choroid (ko' roid) (Gr. chorion, membrane; eidos, form), a vascular layer be- 

 tween the retina and the sclerotic layer of the eye. 

 Chromatid (kro'matid) (Gr. chroma, color), one of two threads and its matrix 



in a chromosome. 

 Chromatin (kro'ma tin) (Gr. chroma, color), part of a nucleus which stains well. 

 Chromatophore (kro' mat o for) (Gr. chroma, color; phoreo, to bear), a colored 



plastid or cell, as chloroplast. 

 Chromidia (kro -mid' i a) (Gr. chroma, color), small particles of chromatin out- 

 side the nucleus, 

 Chromomere (kro' mo mere) (Gr. chroma, color; meros, part), one of a linear 



series of chromatin bodies in a chromosome. 

 Chromonemata (kro mo -nem' a ta) (Gr. chroma, color; nema, thread), threadlike 



structures within the chromosome. 

 Chromosome (kro' mo som) (Gr. chroma, color; soma, body), deeply staining 



bodies formed in the cell nucleus during mitosis; they carry the materials of 



heredity. 

 Chrysophyta (cry -sof i ta) (Gr. chrysos, golden; phyta, plants), golden brown 



algae, yellow-green algae, and diatoms. 

 Chyme (kim) (Gr. kymos, juice), semiliquid partially digested food in the stom- 

 ach. 

 Cilium (sir i um) (L. cilium, eyelash), hairlike, vibratile, cytoplasmic process on 



certain cells, as certain protozoa, etc. 

 Cirrus (sir' us) (L. cirrus, a lock), hairlike structure on certain worms, insects, 



etc. 

 Cleavage (klev'ij) (A.S. cleofan, to separate), division of the zygote into cells 



known as blastomeres. 

 CHtellum (kli -tel' um) (L. clitellae, saddle), thickened area on certain annelids 



to assist in reproduction. 

 Cloaca (klo-a'ka) (L. cloaca, sewer), common organ into which the intestine, 



kidneys, and sex organs discharge their products. 

 Clone (klone) (Gr. klone, twig), all the asexual offspring of an individual which 



are identical in regard to their gene content. 

 Cnidoblast (ni' do blast) (Gr. knide, nettle; hlastos, bud), sac-shaped stinging or 



nettle cell with a permanent, long barbed thread and poisonous fluid as 



in certain coelenterates. 

 Cnidocil (ni' do sil) (Gr. knide, nettle; L. cilium, eyelash), small, triggerlike 



process for ejecting the thread from the cnidoblast. 



