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 Arachnida, 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 



a hydroid 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. 



