INDEX* 



Abdominal pores, 126, 142; function of, 

 in Cyclostomes, 142 



Abducens nerve, 223-224, 236, 241; fora- 

 men of, 44, 60; muscle supplied by, 

 100, 223-224, 241; nucleus of, 236 



Abyssal habitat, 1 



Aca7ithias, 2, fig. 5; cf. Urolophus, 8, 10, 

 11 



Acanthodes, 1 



Accessory efferent-collector arteries, 180 



Accessory lateral cutaneous vein, 217 



Accessory valves of conus, 172 



Accommodation of eye, 269-270 



Adductor mandibulae, 93, 107; artery to, 

 182; function of, 93; nerves of, 241 



Adductor muscles, 93, 107; absent from 

 hyoid, 93, 107; of Chlamydoselachus, 

 107-108; of claspers, 95, 110-112; of 

 visceral arches, 90, 103, 107 



Adductores arcus, 107 



Advehentes, 200, 208 



Afferent arteries, 149, 161, 172-173; 

 branchial, 161, 172, 173; formation of, 

 178; hyoidean, 161, 172, 173; in holo- 

 branch, 149, 153, 157, 173 



Alisphcnoidal cartilage, 53, 55 



Alopias, 2, fig. 2 



Amphistylic, 45 



Ampullae of Lorenzini, 7, 262, 274, 279- 

 280; development of, 281; distribution 

 of, 262, 279-280; modified in spiracle, 

 153, 280; nerves to, 224, 242, 243, 262, 

 280 



Ampullae of semicircular canals, 258-259, 

 273 ; nerves to, 224-225 ; 261, 273 ; struc- 

 ture of, 273 



Ampullary centrum, 280 



Ampullary organs. See Ampullae of Lor- 

 enzini 



Ampullary pockets, 280 



Anal fin, 6, 12, 52; absence of, 12; ar- 

 teries to, 194; skeleton of, 52, 83; vein 

 from, 217 



Ancient sharks, 1, 2 



Angel fish. See Squatina 



Annular arteries, 167, 188 



Annular veins, 201, 210, 211 



Anterior cardinal sinus, 198, 205, 206, 207 



Anterior cardinal system, 204-208 



*For coordination of entries see Contents. 



Anterior cardinal vein, 198, 204 



Anterior cerebral artery, 165, 183 



Anterior cerebral vein, 204, 206-207; fo- 

 ramen for, 44 ; tributaries of, 206-207 



Anterior dorsolateral artery, 168, 191 



Anterior facial vein, 204 



Anterior fontanelle, 43, 57 



Anterior gastric artery, 166, 190 



Anterior gastric vein, 201 



Anterior gastro-pancreaticosplenic artery, 

 167, 189-190 ; in Dasyatis, 188 



Anterior gastro-pancreaticosplenic vein, 

 200, 211 



Anterior gastrosplenic artery, 188 



Anterior intestinal artery, 166, 188; 

 branches of, 166 



Anterior intestinal vein, 201, 210-211; in 

 rays, 210; tributaries of, 201, 210-211 



Anterior lateral artery, 192. See also Lat- 

 eral abdominal artery 



Anterior lobe of hypophysis, 234 



Anterior mesenteric artery. See Superior 

 mesenteric artery 



Anterior oblique semicircular canal, 258, 

 261, 273 



Anterior rectus muscle. See Internal rec- 

 tus muscle 



Antorbital process, 44, 60 ; function of, 60 ; 

 muscle from, 93 



Aortic arches. Sec Embryonic aortic arches 



Appendicular skeleton, 49-52, 75-83 ; div- 

 isions of, 49 



Aqueduct of Sylvius, 235-236 



Aqueous humor, 267 



Arcuales communes muscles, 93 



Arcus communes, 108, 109 



Argentium, 27 



Armament, 1 



Arteria spinalis, 165, 193 



Arteries, 161, 170, 172; cf. veins, 170; iu 

 Elasmobranchs in general, 172-194; in 

 Heptanchus, 161-169; to deeper struc- 

 tures, 169, 192-193; to digestive tract, 

 166-168, 186-191; to extremities, 168, 

 169, 191-192; to head, 165, 180-186; to 

 heart, 163-164, 179-180; to hypobran- 

 chial area, 162-165, 178-180; to trunk, 

 186; to tail, 169, 186, 193-194 



Ascending aorta. See Ventral aorta 



[319] 



