400 GLOSSARY. 



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



comprising Crabs, Lobsters, etc., characterized by trie pos- 

 session of a hard shell or crust, which they cast periodically. 

 CRYPTOGAMS (Gr. kruptos, concealed; games, marriage). A 



division of plants in which the organs of reproduction are 



obscure and there are no true flowers. 

 CTENACANTHUS (Gr. kteis, a comb; akantha, 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 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. " 

 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; opthalmos, eye). A 



genus of fossil Scorpions. 

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



to designate the Hag-fishes and Lampreys, forming the order 



Marsipobranchii. 

 CYPR^A (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. kustis, a bladder; phullon, a leaf). A genus 



of Rugose Corals. 

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



crinoids, " an extinct order of Echinodermata. 



D 



DADOXYLON (Gr. dadion, a torch; xulon, wood). An extinct 

 genus of Coniferous 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 Reptiles. 



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

 genus of Proboscidean Mammals. 



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

 of Graptolites. 



DESMIDUE. Minute fresh-water plants, of a green color, with- 

 out a siliceous epidermis. 



