LIST OF ILLUSTRATIONS. 



FIG. 

 131- 

 132. 



133- 

 134- 

 135- 

 136. 



137- 



138. 



139- 

 140. 



141. 

 142. 



143- 

 144. 



145. 



146. 

 147. 



148. 

 149. 

 150. 



151. 

 152. 



153- 

 154. 



IS5- 

 156. 



157- 

 15S. 



Section of newly fixed larva of Clavellina. (Seeliger), 

 Lateral view oi Amphioxiis. (Ray Lankester), 

 Transverse section through pharyngeal region of Amphi 



oxus. (Ray Lankester), 

 Cross section of Amphioxiis through the gill-slit region 



(BovERi and Hatschek), 

 Early stages in the development of Amphioxiis. (Hat 



schek), ...... 



Three larval stages of Amphioxiis. (Ray' Lankester 



and WiLLEY), ..... 

 Transverse section through an Elasniobranch embryo 



(diagrammatic). (ZlEOLER), 

 Longitudinal section of brain of young dogfish (diagram 



matic). (Gaskell), .... 

 Origin of pineal body. (Beard), . 

 Diagram of the parts of the brain in Vertebrates. 



(Gaskell), ..... 



Diagrammatic section of spinal cord, 

 Diagram of the eye, .... 



Development of the eye. (Balfour and Hertwig), 

 Origin of lungs, liver, and pancreas in the chick. 



(Ga;TTE), .... 



Transverse section through a Teleoslean embryo (dia 



grammatic). (Ziegler), 

 Diagram of circulation. (Leunls), 

 Transverse section through a Vertebrate embryo 



(Semon), ..... 

 Urinogenital system. (Balfour),. 

 Mammalian ovum. (Hertwig), . 

 Median longitudinal section of anterior end of Myxiiie 



(Retzius), .... 



Respiratory system of hag, from ventral surface, 

 Longitudinal vertical section of anterior end of larva 



lamprey. (Balfour), .... 

 Restored skeleton of /'a/(raj/>o«(^'/zM. (Traouair), 

 Under surface of skull and arches of skate. (W. K. 



Parker), ....■• 

 Side view of skate's skull. (W. K. Parker), 

 Skeleton of skate, ..... 

 Dissection of nerves of skate, 

 Side view of chief cranial nerves of Elasmobranchs 



(Cossar Ewart), . . . . . 



408 

 411 



412 



415 

 418 

 419 

 426 



435 

 436 



437 

 442 

 446 



447 



451 



453 

 456 



459 

 460 



463 



467 

 46S 



471 

 474 



479 

 4S0 

 481 

 4S3 



4S6 



