GLOSSARY. 795 



CORPUS CALLOSUM (Lat. the " firm body "). The great band of nervous mat- 

 ter which unites the two hemispheres of the cerebrum in the Mammals. 



CORPUSCULATED (Lat. corpusculum, a little body or particle). Applied to 

 fluids which, like the blood, contain floating solid particles or "corpuscles." 



CORTICAL LAYER. The layer of consistent sarcode, which in the Infusoria 

 encloses the chyme mass, and is surrounded by the cuticle. Sometimes 

 called the "parenchyma of the body." 



COST^E (Lat. costa, a rib). Applied amongst the Crinoidea to designate the 

 rows of plates which succeed the inferior or basal portion of the cup (pel- 

 vis). Amongst the Corals the "costse" are vertical ridges which occur on 

 the outer surface of the theca, and mark the position of the septa within. 



COSTAL (Lat. costa, a rib). Connected with the ribs. 



CRANIUM (Gr. kranion, the skull). The bony or cartilaginous case in which 

 the brain is contained. 



CRASPEDA (Gr. kraspedon, a margin or fringe). The long, convoluted cords, 

 containing thread - cells, which are attached to the tree margins of the 

 mesenteries of a Sea-anemone. 



CREPUSCULAR (Lat. crepusculum, dusk). Applied to animals which are active 

 in the dusk or twilight. 



CRINOIDEA (Gr. krinos, a lily ; eidos, form). An order of Echinodermata com- 

 prising forms which are usually stalked, and sometimes resemble lilies in 



CROCODILIA (Gr. krokodeilos, a crocodile). An order of Reptiles. 



CROP. A partial dilatation of the gullet, technically called "ingluvies." 



CRUSTACEA (Lat. crusta, a crust). A class of articulate animals, comprising 

 Crabs, Lobsters, &c., characterised by the possession of a hard shell or 

 crust, which they cast periodically. 



CTENOCYST (Gr. kteis, a comb ; kustis, a bag or cyst). The sense-organ (prob- 

 ably auditory) which occurs in the Ctenophora. 



CTENOID (Gr. kteis, a comb ; eidos, form). Applied to those scales of fishes, 

 the hinder margins of which are fringed with spines or comb-like pro- 

 jections. 



CTENOPHORA (Gr. kteis, a comb ; an&phero, I carry). An order of Actinozoa, 

 comprising oceanic creatures, with swim by means of "ctenophores," or 

 bands of cilia arranged in comb-like plates. 



CURSORES (Lat. curro, I run). An order of Aves, comprising birds destitute 

 of the power of flight, but formed for running vigorously (e.g., the Ostrich 

 and Emeu). 



CUSPIDATE. Furnished with small pointed eminences or " cusps." 



CUTICLE. (Lat. cuticula, dim. of cutis, skin). The pellicle which forms the 

 outer layer of the body amongst the Infusoria. The outer layer of the in- 

 tegument generally. 



CUTIS (Lat. skin). The inferior vascular layer of the integument, often called 

 the cutis vera, the corium, or the dermis. 



CYCLOID (Gr. kuklos, a circle ; eidos, form). Applied to those scales of fishes 

 which have a regularly circular or elliptical outline with an even margin. 



CYCLOSTOMI (Gr. kuklos ; and stoma, mouth). Sometimes used to designate 

 the Hag-fishes and Lampreys, forming the order Marsipobranchii. 



CYST (Gr. kustis, a bladder or bag). A sac or vesicle. 



CYSTICA. The embryonic forms (scolices) of certain intestinal worms (Tape- 

 worms), which were described as a distinct order, until their true nature was 

 discovered. 



CYSTOIDEA (Gr. kustis, a bladder ; and eidos, form). An extinct order of 

 Echinodermata. 



DECAPODA (Gr. deka, ten ; podes, feet). The division of Crustacea which have 



ten ambulatory feet ; also the family of Cuttle-fishes, in which there are 



ten arms or cephalic processes. 

 DECIDUOUS (Lat. decido, I fall off). Applied to parts which fall off or are 



shed during the life of the animal. 

 DECOLLATED (Lat. decollo, I behead). Applied to univalve shells, the apex of 



which falls off iu the course of growth. 



