GLOSSARY. 66 1 



CTENOPHORA (Gr. Tcteis, a comb ; and phero, I carry). An order of Actinosoa, 

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

 bands of cilia arranged in comb-like plates. 



CURSOKES (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 derma. 



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. dccollo, I behead). Applied to univalve shells, the apex of 

 which falls off in the course of growth. 



DBINOSAURIA (Gr. deinos, terrible ; saura, lizard). An extinct order of Rep- 

 tiles. 



DENDRIFORM, DENDRITIC, DENDROID (Gr. dendron, a tree). Branched like a 

 tree, arborescent. 



DENTiROSTRES(Lat. dens, a tooth ; rostrum, a beak). The group of Perching 

 Birds in which the upper mandible of the beak has its lower margin toothed. 



DERMA. (See Cutis). 



DERMAL (Gr. derma, skin). Belonging to the integument. 



DERMOSCLERITES (Gr. derma, skin ^ skleros, hard). Masses of spicules which 

 occur in the tissues of some of the Alcyonidce (Actinozoa). 



DESMIDLE. Minute fresh-water plants, of a green colour, without a siliceous 

 epidermis. 



DEUTEROZOOIDS (Gr. deuteros, second ; zoon, animal; eidos, form). Thezooids 

 which are produced by gemmation from zooids. 



DEXTRAL (Lat. dextra, the right hand). Right-handed ; applied to the direc- 

 tion of the spiral in the greater number of univalve shells. 



DIAPHRAGM (Gr. diaphragma, a partition). The "midriff," or the muscle 

 which in Mammalia forms a partition between the cavities of the thorax 

 and abdomen. 



DIASTEMA (Gr. dia, apart ; histemi, to place). A gap or interval, especially 

 between teeth. 



DIASTOLE (Gr. diastello, I separate or expand). The expansion of a contrac- 

 tile cavity such as the heart, which follows its contraction or "systole." 



DIATOMACE^E (Gr. diatemno, I sever). An order of minute plants, which are 

 provided with siliceous envelopes. 



DIBRANCHIATA (Gr. dis, twice; bragchia, gill). The order of Cephalopoda 

 (comprising the Cuttle-fishes, &c.) in which only two gills are present. 



DICYNODONTIA (Gr. dis, twice; kuon, dog; odous, tooth.) An extinct order 

 of Reptiles. 



DIDELPHIA (Gr. dis, twice ; delphus, womb). The subdivision of Mammals 

 comprising the Marsupials. 



