LIST OF WOODCUTS. xxiii 



no. 



237. Diagram of the Primitive Condition of the Kidney in an Elasmobranch 



Embryo. (After Bal four.) .................... 303 



228x Diagram of the Arrangement of the Urinogenital Organs in an Adult 



Female Elasmobranch. (After Balfour.) .............. 303 



238 B. Diagram of the Arrangement of the Urinogenital Organs in an Adnlt 



Male Elasmobranch. (After Balfour.) ............... 303 



239. The Entire Viscera of Siphonops annulatus ( 9 ), in situ ........ 305 



240. Diagram of the Urinogenital System of a Male (A) and Female (B) Uro- 



dele ; founded on a preparation of Triton tcRniatus. (After J. W. 

 Spengel.) ............................ 306 



241. Excretory Apparatus of Monitor indicus ............... 308 



242. Male Urinogenital Apparatus of Heron (Ardea cinerea) ........ 309 



243. Diagrammatic Longitudinal Section through the Kidney of a Mammal . . 310 

 '244. Male Urinogenital Apparatus of the Sturgeon ............. 312 



245. Female Urinogenital Apparatus of Protopterus annedens. (From the 



ventral side, natural size.) (After H. Ayers.) ............ 313 



246. Diagram of a Portion of the Male Generative Apparatus of the Gymno- 



phiona ............................. 315 



247. Testis and Anterior End of Kidney of Sana esculcnta. (Semidiagram- 



matic.) ............................. 315 



248. Urinogenital Organs of a Female Bana escuUnta ..... , ..... 317 



249. Female Urinogenital Apparatus of Lacerta muralis .......... 318 



250. Male Urinogenital Organs of Anguis fragilis. (After F. Leydig. ) . . . 319 



251. A, Male Urinogenital Organs of Ornithorftynchus paradoxus ; B, Female 



Urinogenital Organs of Echidna hystrix .............. 321 



252. Female Generative Apparatus of Certain Marsupials. A, DideJphys 



dorsigera (JUT.); B, Phalangista vuJpina; C, Phaseolomys wombat. 

 (After A. Brass.) ......................... 323 



253. Various Forms of Uteri. A, B, C, D, diagrams showing the different 



stages in the fusion of the Miillerian ducts : A, uterus bicomis ; B, uterus 

 simplex ; C, uterus duplex ; D, uterus bipartitus. E, female Urinogenital 

 apparatus of Hustdina, with embryos in the uterus ; F, ditto of 

 Hedgehog (Erinaceus) ...................... 324 



254. Section through a Portion of the Ovary of a Mammal, showing the Mode 



of Development of the Graafian Follicles .............. 325 



2c5. Diagrammatic Section of the Testis of a Mammal ........... 325 



256. Male Urinogenital Apparatus of the Hedgehog (Erinaceus) ....... 326 



257. Semidiagrammatic Figure of the Human Penis. (A, transverse section ; 



B, side view ; C, from below.) ................... 329 



