440 GLOSSARY. 



Cranium, the skull. Gr. kranion. 



Crepuscxjla'ria, a term applied to the Hawk-motbs and other 

 lepidopterous insects that fly in the twilight. Lat. crepus- 



culum, twilight. 

 Crinoid, a family of Star-fishes which have a resemblance to 



the form of a lily. Gr. krinon, a lily, and eidos, form. 

 Crustacea, the class of articulated animals which includes the 



Crab, Lobster, and others possessed of a similar covering. 



Lat. crusta, a shell or hard covering. 

 CxENOiD, a term apphed to a group of fishes which have the 



edges of the scales shaped like the teeth of a comb, as in the 



Perch. Gr. kteis, ktenos, a comb, and eidos, form. 

 Ctclobranchia'ta. an order of molluscous animals of the class 



Gasteropoda, distinguished by having the gills placed round 



the lower edge of the body, as in the limpet. Gr. kykhs, a 



.circle, and branchice, gills. 

 Cycloid, a term applied to a group of fishes which have the 



scales with circular or smooth edges, like those of the Her- 

 ring. Gr, kyklos, a curve, and eidos, form. 

 Ctclos'tomi, an order of cartilaginous fishes, which, like the 



Lampreys, have a circular mouth capable of acting as a 



sucker. Gr. kyklos, a circle, and stoma, a mouth. 

 Cystic Entozoox, an internal parasite resembling a delicate 



cyst or bladder. Gr. kystis, a bladder. 

 Decapitation, the act of beheading. Lat. decapUare, to behead. 

 Deca'poda, that division of the Crustacea which includes the 



Crab, Lobster, Crawfish, and others having ten feet. Gr. 



deka, ten, and pons, a foot. 

 Deglutition, the act of swallowing. Lat. glutio, I swallow. 

 Dentine, the bony substance forming the principal component 



of the teeth. Lat. dens, a tooth. 

 Dibranchia'ta, a numerous family of Cuttle-fish {cephalopoda) 



comprising all species which are furnished with two gills. 

 Dip'tera, an order of insects composed of two-winged Fhes, 



Gr. dis, two, pteron, a wing. 

 Diur'na, a term applied to lepidopterous insects which fly by 



da.y, as Butterflies. Lat. diurnus, belonging to the day. 

 Dorsal, belonging to the back. Lat. dorsum, the back. 

 Dorsibranchia'ta, a tribe of Annelids which have the gills 



placed on the back. Lat. dorsum, the back, branchice, gills. 

 Echinoder'mata. one of the orders of radiated animals: it 



includes the Star-fishes and Sea-Urchins. The term is 



expressive of the appearance of their integument. Gr. 



echinos, a hedge-hog ; and derma, a skin or covering. 

 Edenta'ta, an order of mammalia, which comprises the Sloth 



and Ant-eater, animals which are either destitute of teeth, 



or have no incisors or cutting teeth. Lat. edentatus, without 



teeth. 

 Effete, barren, worn out. Lat. effoetus, or effetus, decayed, 



past work. 

 Elytra, the sheaths or wing-covers of coleopterous insects 



(Beetles). Gr. elytron, a sheath. 



