INDEX 



82!) 



Pretiematicus nerve (VII), 243; (IX), 

 225, 244; (X), 149, 225, 245 



Primary renal corpuscle, 299 



Primitive ova, 301 



Pristis, 3, 9, fig. 19 ; tooth of, figs. 39, 41 



Pristiunis, development of fin skeleton of, 

 15-16 



Proctodeum, 128 



Pronephrotic duct, 298, 299 



Propterygium, 50, 77; development of, 77 



Prosenceplahon, 230; derivatives of, 230 



Pseudobranchial artery, 165, 182; in em- 

 bryo, 182; in rays, 180 



Pterygial arteries, 191 



Pulp cavity, 32, 35 



Pupil of eye, 268 



Pyloric stomach, 123, 135 



Pyloric valve, 123, 136 



Quadrate, 45, 62 



Eadial cartilages, 50, 51, 77, 78, 79; de- 

 velopment of, 77-78; of pectorals, 75- 

 76; of pelvic, 81; postaxial radials, 50, 

 79; preaxial radials, 50 



Eadial muscle, 94-95 



Baia erinacea, 9, fig. 20 



Eamuli to lateral line canal, 278 



Eamus anastomoticus artery, 165, 183; 

 foramen of, 44; function of, 181 



Eamus dorsalis artery, 192 



Eamus dorsalis nerve (IX), 225; (X), 

 225, 245, 278 



Eamus hyoideus (VII), 243 



Eamus oticus (VII), 242, 279; relation of, 

 to spiracle, 153 



Eamus palatinus, 224, 243 



Eamus ventralis artery, 192 



Eamus visceralis (or intestinalis) (X), 

 227, 245 



Eays : batfish, 3 ; Cephaloptera, 3 ; elec- 

 tric, 3; guitar fish, 9; sawfish, 3, 9; 

 small sting, 8; spiracle of, 150 



Eecessus neuroporicus, 221 



Eecessus utriculi, 259, 272; nerve to, 273 



Eectal gland, 121, 126, 141; artery of, 167, 

 191; function of, unknown, 141; rela- 

 tion of, to epigonal organ, 300; struc- 

 ture of, 141; veins of, 200, 211 



Eectal artery, 169, 192 



Eectum, 126, 141; artery to, 169, 192; in 

 Heptanchus, 126; mesentery to, 121; 

 veins of, 213 



Eectus abdominalis, 97 



Ecd blood cells. See Erytiirocytos 



Eenal artery, 169, 192, 193 



Eenal coi-puscle, 296, 299, 300; develop- 

 ment of, 299-300; function of, 296; 

 primary, 299; secondary, 299 



Eenal portal system, 204, 208-209; rela- 

 tion of, to subintestinal vein, 208 



Eenal portal vein, 208 



Eenal tubule, 297, 298, 299, 300 



Eespiration, 157 



Eespiratory current, 155; course of, 156; 

 direction of, 156; reversal of, in rays, 

 156; in Urolophus, 157 



Eespiratory membrane, 149 



Eespiratory tract, 147, 150; of Elasmo- 

 branchs in general, 150-157; of Eep- 

 tanclius, 147-149 



Eestiform bodies. See Corpora restiforme 



Eetina, 268; cells of, 268-269; develop- 

 ment of, 269; nerve from, 269; struc- 

 ture of, 268-269 



Eetractor palpebrae superioris, 102 



Eevehentes, 210 



Bhinohatis productus, 9, fig. 7. 



Bhinodon (BJiineodon) typiciis, 3 ; color 

 of, 26, 27 



Ehombencephalon, 230 



Eibs, 48, 72 



Eods of retina, 269 



Eostrum, 43, 55, 57; in Acanthias, 57 



Sacci vasculosi, 233 



Saccular nerve, 273 



Sacculus, 259, 272 



Sawfish (Pristis), 9 



Saw tooth, 35; development of, 35; struc- 

 ture of, 35 



Scales. See Placoid scales 



Scapula, 49, 79; muscles to, 94, 104 



Scapular canal, 277 



Schneiderian folds, 264; development of, 

 265; primary, 265; secondary, 265 



Sclera, 258, 268; in Cetorhinus, 268 



Sclerotome, 70, 96 



Scroll valve, 139 



Scyllium, development of pectoral girdle 

 of, 15 



Scymnus, epidermis of, 26 



Secondary dentine, 34; origin of, 34 



Segmental artery, 169; branches of, 169, 

 192-193; caudal, 169, 193 



Segmental duct, 296, 297, 298; develop- 

 ment of, 298 



Selachii, 8 



