INDEX. 



295 



pearancG, 229; views as to its mean- 

 ing, 229 



Supra-renal bodies ; their structure in 

 the adult, 239 ; developed from sym- 

 pathetic ganglia, 2-10 



Sympathetic nervous system {see Nerv- 

 ous system) 



Synapta, derivation of mesoblast in, 

 123 



Tail-sweUings, 73, 74, 77, 87 



Teleostei, embryos of, 89, 90 



Terebratula, mesoblast and body-ca- 

 vity, 123 



Testicular net-work, 258 



Thyroid body ; its formation in region 

 of mandibular arch, 223 ; it becomes 

 solid, 224; previous investigations, 

 225 



Todaro, Prof., endostyle and noto- 

 chord, 96 



Torpedo embryos, 82, 86, 98, 102, 111, 

 139, 157, 223, 228; layers of epiblast, 

 70; sesrmental duct, 128; notochord, 

 136, 223, 228 



Trout, embryo of, 4, 87 



Tunicates, derivation of mesoblast, 

 121 



Turbellarians, 170 



Ureters, 251, 253, 273 



Urinal cloaca, 271 



Urinogenital system in stages G to K, 

 108, 127 ; development of segmental 

 duct and segmental tubes, 127, 128 ; 

 formation of a lumen, 129 ; opening 

 of duct and tubes into body-cavity, 

 130 ; comparison of duct and tubes, 

 130 ; primitive ova, their position 

 and structure, 130 — 136 ; organs in 

 adult Elasmobranch, female, 285, 

 male, 286 



Vacuoles, 13, 94, 136 



Vagus, lateral nerve, a branch of, 142, 



146 

 Vagus nerve, development of, 202 



Van Beneden, germinal vesicle of 

 mammalia, 5 ; formation of the lay- 

 ers, 40, 69, mammalian ovum, 92 



Vasa efferentia, 257 ; views of Semper 

 and Spengel, 275; general homolo- 

 gies, 279 



Vascular system and vascular glands, 

 230—247 



Vascular glands: supra-renal and in- 

 ter-renal bodies, 237; previous in- 

 vestigations, 238 



Venous system, development of, 233 



Ventro-lateral muscles, 149 



Vermes, segmented and unsegmented ; 

 nervous systems, 171 



Vertebral bodies, 107, 112 



Vertebral column, 126 ; from stage K, 

 150 



Vertebrate ovum, 55 



Vertebrates, development of nerves in, 

 162, 164 



Vesicle, germinal, atrophy of the, 5 



Visceral clefts, indication of segmenta- 

 tion of the head, 212 



Von Baer, double formation of heart 

 in birds, 231 



Wagner, embryo of sturgeon, 91 



Waldeyer, vertebrate eggs, 55 ; inter- 

 mediate cell-mass in the chick, 108 ; 

 intermediate cell-mass, 127 ; germi- 

 nal epithelium, 134 



Wilder, Prof, B. G., development of 

 brain, 182 



Wolf&an body: general account, 271; 

 details of formation of ureters, 273 



Wolffian duct {see Mullerian and 

 Wolffian ducts) 



Wyman, Prof., circulation of yolk-sack 

 in Eaja batis, 235 



Yolk, nuclei of the, 24, 38, 48, 51, 57; 

 enclosed by blastoderm, 80; proto- 

 plasmic net-work of, 90 

 Yolk-sack, circulation of, 235 

 Yolk spherules, 11, 12, 29, 34, 36, 37, 

 39, 43, 52, 82, 94, 135, 136 



CAMBRIDGE : PRIMTED BY C. J. CLAY, M.A., AT THE UNIVERSITY PRESS. 



