792 



INDEX 



Ciliary region, chai'acteristics in 

 anurans, 335, 338 

 birds, 403, 405, 406 

 chelonians, 361, 372 

 chondrosteans, 317 

 crocodilians, 376 

 lacertilians, 356, 358 

 Latimeria, 315 

 marsupials, 438, 439 

 monotremes, 433, 434 

 placentals, 460, 461 

 selachians, 283 

 snakes, 385, 388 

 Sphenodon, 380 

 teleosts, 301 

 urodeles, 347 

 roll, in snakes, 386, 388 

 sinus. See Ciliary cleft, 

 venous plexus, in placentals, 472, 473 

 sinus, characteristics in 

 anurans, 336 

 birds, 408 

 chelonians, 372 

 crocodilians, 376 

 lacertilians, 359 

 marsupials, 439 

 monotremes, 435 

 snakes, 386 

 Sphenodon, 380 

 See also Schlemm's canal, 

 web, in mo"notremes, 435 

 Ciliata, 180 

 Ciliophora, 180 



Cilio-scleral sinvis. See Ciliary cleft, 

 Cinyxis erosa, fundus, PI. VII 

 Ciona, pigmented spots in, 228 

 Circle of Hovius, 472 

 Circulus arteriosus iridis major, 468 



minor, 468 

 Circum-ocular sulcus, of teleosts, 311 

 Circum- oesophageal ring, in crustaceans, 

 521 

 insects, 521, 522 

 molluscs, 527 

 Circus movements, 54, 525 

 Cirripedes, 208 

 eyes of, 209 



vestigial, in adults, 209 

 nauplius of, 208 



eyes of, 209 

 nervous system, 521 

 Cirrothauma murrayi, eyes lacking in, 723 

 Cistella, larva, ocelli in, 195 



Citellus citellus. See Souslik. 

 Civet cat, 444, 445 

 Cladocera, 207 



conditioning of, 578 



orientation to polarized light in, 73 



phototactic response of, 578 



See also Daphnia, Polyphemus, etc. 

 Cladophora, eye -spot in, 125 

 Clemmys, 682 



iris, 370 



visual field, binocular, 682 

 Clethrionomys. See Vole, red-backed. 

 Clupea harengus, 299 



falciform process, 299 

 larvae, activity of, 34 



pilchardus, visual cells of, 307 

 Clupeidae, adipose lids in, 311 



See also Clupea, Engraulis, Chanos. 

 Cnidaria, 182 

 Coati, 444, 445 



pupils, 472 

 Cobra, 386 



See also Elapidae, Naja. 

 Cochlea, 534, 690 

 Cockle. See Cardium. 

 Cockroach, 218, 220 



nocturnality of, 34 



vision of, 584 



See also Blattella, Blatta, Periplaneta. 

 Cod. See Oadus. 

 Coelacanth, 235, 278, 315 



accommodation lacking in, 640 



choroidal tapetum, 609 



eyes of, 314, 316 



nocturnality of, 603 



retina, rod-rich, 610 

 Coelenterates, 181 



bioluminescence in, 739, 745, 748 

 rhythmic, 22 



myo -epithelial cell, 513 



nerve-net, 512, 514, 515 



phototactic reactions of, 571 



sense organs of, 182 

 Colaptes, choroid, 405 



auratus, 420 



green oil-droplets, 420 

 Coleonyx, rods of, 364 

 Coleoptera, 219, 220 



eyes of, 167, 224 



larvae, ocelli of, 141, 223 



luminous organs in, 740, 742, 748 



neuro-endocrine system, 555 



See also Dytiscus, Necrophorus, etc. 



