384 GLOSSARY. 



CRINOIDEA (Gr. Jcrinon, a lily ; eidos, form). An order of KchinofJermafa, 



comprising forms which are usually stalked, and sometimes resemble lilies 



in shape. 



CRIOCERAS (Gr. krios, a ram ; keras, a horn). A genus of Ammonitidce. 

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

 CROSSOPTERYGID^E (Gr. krossotos, a fringe ; pterux, a fin). A sub-order of 



Ganoids in which the paired fins possess a central lobe. 

 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. 

 CRYPTOGAMS (Gr. kruptos, concealed ; gamos, marriage). A division of plants 



in which the organs of reproduction are obscure and there are no true 



flowers. 

 CTENACANTHUS (Gr. kteis, a comb ; akantJia, a thorn). A genus of fossil fishes, 



named from its fin-spines. 

 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 projections. 

 CURSORES (Lat. curro, I run). An order of Avex, 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." 

 CYATHOCRINUS (Gr. kuathos, a cup ; krinon, a lily). A genus of Crinoids. 

 CYATHOPHYLLUM (Gr. kuathos, a cup ; phullon, a leaf). A genus of Rugose 



Corals. 

 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. 

 CYCLOPHTHALMUS (Gr. kuklos, a circle ; ophthalmos, eye). A genus of fossil 



Scorpions. 

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



Hag-fishes and Lampreys, forming the order MrsipobrancMi. 

 CYPRjEA (a name of Venus). The genus of Univalve Molluscs comprising the 



Cowries. 

 CYRTOCERAS (Gr. kurtos, crooked ; keras, horn). A genus of Tetrabranchiate 



Cephalopods. 

 CYSTIPHYLLUM (Gr. kusti-s, a bladder ; phullon, a leaf). A genus of Rugose 



Corals. 

 CYSTOIDEA (Gr. kustis, a bladder ; eidos, form). The " Globe-criuoids," an 



extinct order of Echinodermata. 



DADOXYLON (Gr. dadion, a torch ; xulon, wood). An extinct genus of Con- 

 iferous trees. 



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

 ten 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. 



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

 tiles. 



DEINOTHERIUM (Gr. deinos, terrible ; therion, beast). An extinct genus of 

 Proboscidean Mammals. 



DENDROGRAPTUS (Gr. dendron, tree ; grapho, I write). A genus of Grapto- 

 lites. 



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

 epidermis. 



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. 



DICERAS (Gr. dis, twice ; keras, horn). An extinct genus of Bivalve Molluscs. 



DICTYONEMA (Gr. diktuon, a net ; nema, thread). An extinct genus of Poly- 



