CLO- 



54 



coc- 



A shallow depression in the sphen- 

 oid, behind the dorsum sellae 

 (anat.). 



cloaca (kloa'ka, klo'aka) n. [L. cloaca, 

 a sewer.] The common chamber 

 into which intestinal, genital, and 

 urinary canals open, in vertebrates 

 except most mammals (zool.}. 



clone (klon) n. [Gk. klon, a twig.] 

 Desma, which see. 



clonus (klo'nus) n. [Gk. klonos, violent 

 motion.] A series of muscular con- 

 tractions when the individual con- 

 tractions are discernible ; incom- 

 plete tetanus (phys.). 



clump (klump) v. [Ger. klump, a 

 mass.] To form lumps or knots 

 (bot.). 



clypeal (klip'eal) a. [L. clypeus, a 

 shield.] Pert, the clypeus of insects 

 (zool.). 



clypeate (klip'eat) a. [L. clypeus, a 

 shield.]. Round or buckler-like 

 (biol.) ; having a clypeus (zool.). 



clypeola (klipe'dla), clypeole (klip'eol) 

 n. [L. clypeus, a shield.] A sporo- 

 phyll in the spike of an Equisetum 

 (bot.). 



clypeus (klip'eus) n. [L. clypeus, a 

 shield.] A shield on the antero- 

 median part of an insect's head 

 (zool.) ; a band of tissue round the 

 mouth of a perithecium of certain 

 Fungi (bot.). 



cnemldlum (nemid'ium, knemid'ium) 

 n. [Gk. knemis, a legging.] The 

 lower part of a bird's leg devoid of 

 feathers. 



cnemls (ne'mis, kne'mis) n. [Gk. 

 knemis, a legging.] The shin or 

 tibia (zool., anat.). 



cnida (n^da, knl'da) n. [Gk. knide, a 

 nettle.] A cnidoblast. 



cnldoblast (nl'doblast, knl'doblast) n. 

 [Gk. knide, a nettle ; blastos, a 

 bud.] A stinging cell ; a goblet- 

 shaped cell with a long barbed 

 thread and poisonous fluid in the 

 interior, and a trigger-like process 

 projecting externally, found in cer- 

 tain Coelenterates (zool.). 



cnidocil (nfdtisll, knl'dosil) n. [Gk. 

 knide, a nettle ; L. cilium, an eye- 

 lid.] A minute process projecting 

 externally from a cnidoblast (zool.). 



cnidophore (nl'dofor, knfdofor) n. 

 [Gk. knide, a nettle ; pherein, to 



bear.] A modified zooid which 

 bears nematocysts, of the nature 

 of a dactylozooid (zool.). 



cnidopod (ni'dopod, knfdopod) n. 

 [Gk. knide, a nettle ; pous, a foot.] 

 The drawn-out basal part of a 

 nematocyst, embedded in the meso- 

 gloea (zool.). 



cnidosac (nl'dosak, knfdosak) . [Gk. 

 knide, a nettle ; L. saccus, a bag.] 

 A kidney-shaped swelling or battery, 

 often protected by a hood, found on 

 the dactylozooids of Siphonophores 

 (zool.). 



coadaptation (ko'adapta'shun) n. [L. 

 cum, with ; ad, to ; aptare, to fit.] 

 The correlated variation in two 

 mutually dependent organs (phys.). 



coagulation (koagula'shun) n. [L. 

 cum, with ; agere, to drive.] Curd- 

 ling or clotting ; the changing from 

 a liquid to a viscous or solid state 

 by chemical reaction (phys.). 



coagulin (koag'ulin) n. [L. cogere, to 

 drive together.] Any substance 

 capable of coagulating albuminous 

 substances (phys.). 



coagulum (koag'ulum) n. [L. cogere, 

 to drive together.] Any coagulated 

 mass (phys.). 



coarctate (koark'tat) a. [L. coarctare, 

 to press together.] Closely con- 

 nected (biol.) ; having abdomen 

 separated from thorax by a con- 

 striction (zool.). 



coarctate larva or pupa, semipupa ; 

 pseudopupa ; a larval stage of 

 certain Diptera (zool.). 



cocci (kok'sl) n. plu. [Gk. kokkos, a 

 seed.] Septicidal carpels ; spore 

 mother cells of certain hepatics 

 (hot.) ; rounded cells, as some 

 bacteria (bact.). 



coccogone (kok'ogon) n. [Gk. kokkos, 

 a seed ; gonos, birth.] A repro- 

 ductive cell in certain Algae (hot.). 



coccoid (kSk'oid) a. [Gk. kokkos, a 

 seed ; eidos, form.] Pert, a coccus ; 

 spherical or globose (bot., bact.). 



coccolith (kok'ollth) n. [Gk. kokkos, a 

 seed ; lithos, a stone.] A calcareous 

 spicule in certain of the Flagellates 

 (zool.). 



coccospheres (kok'osferz) n.plu. [Gk. 

 kokkos, a seed ; sphaira, a globe.] 

 Collections of undigested shells in 

 certain Radiolarians (zool.). 



