392 



ZOOLOGY 



cephalothorax, united head and thorax. 

 cere, a waxy sheath at the base of the 



bill of certain birds, 315. 

 chelicera, the first pair of mouth ap- 

 pendages in the Arachuida, 80. 

 cilia, microscopic, vibratile processes 



of certain cells. 

 cirrus, a filamentous appendage of the 



parapodia of Annelida, 159. 

 cleavage, the multiplication of cells at 



the beginning of the development of 



the egg, 193, 336. 

 clitellum, a thickened glandular ring 



sometimes found in the earthworm. 

 coxa, that joint of an Arthropod leg 



which is nearest the trunk, 59. 

 culmen, the upper ridge of a bird's bill. 

 cuticula, the tough secreted "skin" 



covering arthropods, hydroids, and 



other animals. 



dentary, a bone of the lower jaw of 

 fishes which carries the teeth. 



dextral, right, applied to right-handed 

 shells, 166. 



diaphragm, a dividing membrane, 119. 



elytron, the horny upper wings of 

 beetles, 59. 



enamel, the hard covering of teeth 

 and some fish scales, 248. 



encyst, the act of secreting a cyst or 

 vesicle, 227. 



enteric, pertaining to the enteron or 

 food canal. 



epidermis, the outermost skin of ver- 

 tebrates; also a superficial horny 

 secretion over the shells of mol- 

 lusks, 175. 



epimeron, a lateral piece behind the 

 episternum of insects, 59. 



epiotic, one of the bones surrounding 

 the inner ear in the lower verte- 

 brates, 232. 



episternum, a piece just lateral to the 

 sternum in the thorax of insects, 59. 



epistome, in beetles, a piece above the 

 mouth, 59. 



facetted, composed of numerous small 

 eyes, making up a compound eye, 78. 



femur, thigh of insects, 59. 



fertilization, the union of two germ- 

 cells, 335. 



flagellum, a microscopic, lash-like, 

 vibrating thread of certain Infuso- 

 ria, 226. 



foliaceous, leaf -like. 



frontal, applied to a bone of the skull 

 lying between the orbits, 232. 



gastrolith, a calcareous nodule occur- 

 ring in the stomach of the higher 

 Crustacea, 103. 



gastrula, a stage in development of 

 the egg just after the digestive cav- 

 ity has been formed, 193. 



gastrulation, the process of forming 

 the gastrula, 336. 



gonad, a germ-producing gland, 221. 



gonophore, a sexual zooid, generally 

 reduced to an exclusively reproduc- 

 tive function, 212. 



gula, the throat plate on under part of 

 the head of insects, 59. 



hsemal, relating to the blood system. 



hirsute, hairy, shaggy, 42. 



hydranth, the "heads" or zooids of 



ahydroid stock, 210. 

 hyomandibular, a bone which, in 



fishes, connects the lower jaw with 



the skull, 232. 



imago, the adult of an insect. 

 intermaxillary, the same as premaxil- 

 lary. 



