366 GLOSSAKY. 



comprising oceanic creatures, wliicli swim by means of *' ctenophores,'' or 

 bands of cilia arranged in comb-like plates. 



CuRSORES (Lat. curro, I run). An order of Birds, comprising birds in ■which 

 there is no power of flight, but the body is formed lor running vigorously. 



Cuticle (Lat. cuticula, diminutive of cutis, skin). The transparent pellicle 

 which forms the outer layer of the body in Iv/usoria. The outermost layer 

 of the integument generally. 



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

 which have a regularly circular or elliptical outline. 



Cystic {Gr. kustis, a bladder). Applied to the embryonic forms of the Tape- 

 worms which were originallj'" described as a distinct order of Parasitic 

 Worms under the name of Cystica, or "Bladder- worms." 



Cystoidea (Gr, kustis, a bladder; eidos, foim). An extinct order of ^c/imo- 

 dermata. 



Cytode (Gr. kufns, a vessel or cell ; eidos, form). A minute mass of proto- 

 plasm resembling a true cell, but destitute of a nucleus, and without a pioper 

 wall. 



Dfcapoda (Gr. deka, ten ; podes, feet). The division of Crustacea with ten 

 legs adapted for walking {e.g., Crabs and Lobsters). Also, the family of 

 Outtle-lishes {Cephalopoda) in which the mouth is surrounded by ten pro- 

 cesses or "arms." 



Deciduous (Lat. deddo, I fall off). Applied to parts which fall off or are shed 

 during the liie of the ani'maL 



Dkinocerata or Dinocekata (Gr. deinos, terrible ; keras, horn). An extinct 

 order of Tertiary Mammals. 



Deinosauria or Dinosauria (Gr. deinos, terrible ; saura, lizard). An ex- 

 tinct order of Reptiles. 



Dental (Lat. dens, a tooth). Connected with the teeth. 



Dentjrostres (Lat. dens, a tooth ; rostrum, beak). The division of the 

 Perching Birds in which the upper mandible of the bill has its lower margin 

 toothed. 



Diaphragm (Gr. diaphragma, a partition). The "midriff/' or the muscle 

 which in Mammalia separates the cavity of the chest from that of the 

 abdomen. 



Dibranchtata (Gr, dis, twice ; hragchia, gills). The order of Cephalopoda 

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



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

 of Reptiles, called by Owen Ancmiodontia. 



Digit (Lat, digitus, a finger). A finger or toe. 



DiGiTlGRADA (Lat. digitus, a finger ; gradior, I walk). The division of 

 Carnivora in which the aninial walks upon the tips of the toes. 



Dipnoi (Gr. din, twice ; pnoi, breath). The order of Fishes represented by the 

 Lepidosircn. 



DiPTERA (Gr. dis, twice ; pteron, a wing). An order of Insects characterised 

 by the possession of two wings only. 



DiscoPHORA (Gr. diskos, a quoit, or round plate ; phero, I carry). The 

 Medusce, or Jelly-tishes, so called from their form. Also the order of the 

 Leeches (J/irudinea), from the suctorial discs which they possess. 



Distal. Applied to the quickly growing end of the hydrosoma of a Bydro- 

 zoon; also to the end of a limb, or any portion of a limb, furthest removed 

 from the trunk. 



Diurnal (Lat. diurnus, daily, by day). Aj^plied to animals which are active 

 during the day. 



Dorsal (Lat. dorsum, the back). Connected with the region of the back. 



Echinodermata (Gr. echinos, a hedgehog; derma, skin). A class of animals 

 comprising the Sea-urchins, Star-fishes, and others, most of which have 

 spiny skins. 



EcHiNOiDEA (Gr. echinos, a hedgehog ; eido?, form). An order of JSchinoder- 

 mata, comprising the Sea-urchins. 



