INDEX 



Numbers in Italics give Systematic Position. Numbers in Black Type 



refer to Figures 



Amph. =Amphineura 

 Ast. = Asteroidea 

 Blast. = Blastoidea 

 Grin. = Crinoidea 

 Cyst. = Cystidea 

 Echin. = Echinodermata 

 Echinoid. = Echinoidea 



Ent. = Enteropneusta 

 Gastr. = Gastropoda 

 Hoi. = Holothurioidea 

 Lam. = Lamellibranchia 

 Moll. = Mollusca 

 Oph. = Ophiuroidea 



ABATUS cavernosus, apical system, 324 

 Abranchia, 12 

 Acanthaster, 299 



,, echinaster, 421 



,, Ettisii, 421 



Acanthochiton, 165 

 AcantJwdoris, 13 

 Acanthology, 387 



Acanthotrochus mirabilis, "wheel," 337 

 Acephala, 14, 177 

 Accra, 10 

 Aceste, 293 



Acetabula (Moll.), 117 ; (Echinoid.), 390 

 Aciculidce, 6 

 Acmaea ( = Tectura), 5 

 Acmaeidce, 5 

 Acrocidaris, 290 

 Acrocrinidce, 308 

 Acrocrinus, 309 

 Actceon, 110 

 Actceonidce, 10 

 Actinocrinidce, 307 

 Actinocrinus, 307 



,, proboscidalis, apical system, 



329 



,, verneuilianus, 423 



Actinocucumis, 338 



Actinomctra, 313; food grooves, diagr., 

 366 



,, strata, 365 



Actinopoda, 285 ; oral region, section, 428 

 Adambulacral ossicles, 352 ; radii, 316 

 Adetes, 293 

 Adradii, 316 



13 



jEolidiadce, 13 

 ^Eolis, alimentary canal, 192 



rufibranchialis, 12 

 jErope, 293 

 ^Esthetes, 166 

 ^Etkeria, 62 

 Agaricocrinus, 307 

 Agassizia, 293 

 Agassizocrinus, 304 

 Agelacrinus, 313 



,, cincinnatensis, 313 



Aglossa, 14, 177 

 Amalia, 76 

 Ambiti;s, 338 

 Amblypygus, 345 

 Ambulacra, 339 

 Ambulacra! brush (Echinoid. ), 433 ; gills 



(Echinoid.), 433 ; ossicles, 352 ; radii, 



316 



Ammonitidea, 22 

 Amnion, 523 



Amcebocytes (Moll.) 200 ; (Echin.), 415 

 Amphiaster, 297 

 A mphidromus, 160 

 Amphineura, 2 

 Amphipeplea, 8 



,, leuconensis, 8 



Amphisphyra, 46 

 Amphisternal test, 349 

 Amphiura, 300 



,, magellanica, 495 

 ,, squamata, apical system, 327 ; 



stone canal, 422 



