6i6 



INDEX 



Circulation of blood (cont.) 



costraca, 3 1 2 ; in Nemertea, 207 ; in 

 Ostracoda, 314; in Scorpionidea, 

 450. See also Vascular system 



Circulation of food, in Alcyonium, 

 160; in Aurelia, 152; in Daphnia, 

 328; in Ohelia, 134 



Circulatory system, see Vascular 

 system 



Circulus venosus, 484 



Circumoesophageal connectives, see 

 Nervous system 



Cirrhal ossicles, 580 



Cirrhals, 580 



Cirri, of Crinoidea, 578 ; of Protozoa, 

 14; of Thoracica, 340 



Cirripedia, 338; 294, 297, 314, 316 



Cladocera, 324; 291, 317 



Classification, vii, i ; of Brachiopoda, 

 542; of Cephalopoda, 512; of 

 Gasteropoda, 489 ; of Lamelli- 

 branchiata, 504; of Myriapoda, 

 375; of Opisthobranchiata, 494; 

 of Polyzoa, 536; of Protozoa, 38; 

 of Pulmonata, 495 ; of Radiolaria, 7 1 



Clathrina, 117 



Clathrulina, 81; 8, 10 



Clava squamata, 132 



Clavelina, 602; 599 



C. lepadiformis , 602 



Clavularia, 160 



Cleavage or Segmentation of Ovum, 

 in Archiannelida, 247-8 ; in Arthro- 

 poda, 280; in Balanoglossus, 590; 

 Centrolecithal, 280, 314; in 

 Ciona, 597; in Crustacea, 314; in 

 Ctenophora, 173 ; in Echinoder- 

 mata, 555; in Medusae, 131; in 

 Mollusca, 247-8 ; in Nemertea, 

 247-8 ; in Polychaeta, 247-8 ; in 

 Polycladida, 247-8; in Pyrosoma, 

 684; Radial spiral, 248 



Clepsine, 244, 265, 266 



Cliona, 119 



Clitellum, 253 ; 256, 259 



Cloaca, of Holothuroidea, 575 ; of 

 Nematoda, 220; of Rotifera, 212; 

 of Tunicata, 595 



Clypeaster, 571 



Clypeastroida, 571 ; 570 



Cnidaria, 131 ; 125 



Cnidoblast, see Thread cell 



Cnidocil, 127 



Cnidosporidia, 93 



Coarctate pupae, 440 ; 402 



Coccidia, 83 



Coccidiomorpha, 83 



Coccolithophoridae, 46 



Coccoliths, 46 



Codosiga, 60 ; 4 



C. umbellata, 59 



Coelenterata, 125; i, 120, 171, 173 



Coeliac canal, 580 



Coelom, 122; 2, 121; of Acantho- 

 hdella, 267 ; of Annelida, 228 ; of 

 Archiannelid genera, 261, 262, 

 263 ; of Arenicola, 240 ; of Arthro- 

 poda, 279 ; of Balanoglossus, 585 ; of 

 Brachiopoda, 540, 542 ; of Cepha- 

 lochorda, 583, 584; of Chaeto- 

 gnatha, 542, 544; of Chaetopoda, 

 228, 229; of Chordata, 583; of 

 Crinoidea, 580 ; of Crustacea, 309 ; 

 of Dipleurula, 551 ; of Echinoder- 

 mata, 550, 551, 557; of Entero- 

 pneusta, 583, 584; of Gephyrea, 

 229; of Hirudinea, 228, 265; of 

 Mollusca, 470 ; of Peripatus, 283 ; 

 of Polyzoa, 530; of Sepia, 518; of 

 Snail, 483 ; of Tunicata, 584, 597 ; 

 of Vertebrata, 584. See also Peri- 

 cardium, Perivisceral cavity 



Coelomoducts, 123; of Arthropoda, 

 279; of Chaetopoda, 229; of 

 Crustacea, 311; of Polychaeta, 

 242 



Coeloplana, 173 



Coenosarc, of Calyptoblastea, 133; 

 of Polyzoa, 532 



Colacium, 48 



Coleoptera, 429 



Coleopterous larvae, 401 



Collar, of Balanoglossus, 585 ; of Chae- 

 topterus, 237 ; of Choanoflagellata, 

 59, 60; of Pterobranchia, 590 



Collar cavities, 584 ; of Balanoglossus, 



585 

 Collar cells, see Choanocytes 

 Collar pores, 584; of Balanoglossus, 



585 

 Collembola, 408 

 Colleterial glands, 397 

 Collinia, 100; 28 n. 

 Colloblasts, see Lasso cells 

 Collozoum, 76 

 C. inerme, 36 

 Collum, 381 

 Colon, see Large intestine 



