xxiv List of Illustrations 



PAGE 



Notropis whipplii, Silver -fin 457 



Gymnothorax moringa 45° 



Seriola lalandi, Amber-fish 45° 



Geological Distribution of the Families of Elasmobranchs 459 



"Tornaria" Larva of Clossobalanus minutus 403 



Clossobalamis minutus 404 



Harrimania maculosa 405 



Development of Larval Tunicate to Fixed Condition 47i 



Anatomy of Tunicate 47^ 



Ascidia adherens 474 



Styela yacutatensis 475 



Styela grecleyi 47^ 



Cynthia superba 47^ 



Bolryllus magnus, Compound Ascidian 477 



Botryllus magnus 47^ 



Botryllus magnus, a Single Zooid 479 



Aplidiopsis jordani, a Compound Ascidian 479 



Oikapleura, Adult Tunicate of Group Larvacea 480 



Branchiostoma calijorniense, California Lancelet 484 



Gill-basket of Lamprey 485 



Polygnathus dubium 488 



Polistotrema stoiiti, Hagfish 489 



Pctromyzon marinus, Lamprey 491 



Petromyzon marinus iinicolor, Mouth Lake Lamprey 492 



Lampetra wilderi, Sea Larvae Brook Lamprey 492 



Lampetra wilderi, Mouth Brook Lamprey 492 



Lampetra camtschalica, Kamchatka Lamprey 495 



Enlosphenus tridentatus, Oregon Lamprey 496 



Lampetra ijuilderi, Brook Lamprey 505 



Fin-spine of Onchus tenuistriatus 509 



Section of Vertebrae of Sharks, showing Calcification 510 



Cladoselache jyleri ji^ 



Cladoselache jyleri. Ventral View jij 



Teeth of Cladoselache jyleri cjc 



Acanthocssus wardi rjr 



Diplacanthus crassissimus cjy 



Climatius sciitiger cj jg 



Pleuracanthiis decheni rjg 



Pleuracanthus decheni. Restored C20 



Head-bones and Teeth of Pleuracanthus decheni r2o 



Teeth of Didymodus bohemicus ,-20 



Shoulder-girdle and Pectoral Fins of Cladodus ncilsoni 1-21 



Teeth of Cladodus striatus -22 



Hexanchus griseus, Griset or Cow-shark C211 



Teeth of Heptranchias indicus _^ 



